diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 2e8d5e3..7dc9960 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -38,6 +38,7 @@ Rolf Ahrenberg
   for suggesting to include the charset in HTTP replies
   for requesting replacement of asprintf calls
   for suggesting to change the URL path from EXTERN to EXT
+  for suggesting increased thread priorities for cStreamdevWriter/Streamer
 
 Rantanen Teemu
   for providing vdr-incompletesections.diff
@@ -153,7 +154,20 @@ carel
   for helping to find a way to cleanly shutdown externremux with mencoder
 
 wolfi.m
-  for reporting a typo in externermux quality parameter value
+  for reporting a typo in externremux quality parameter value
 
 Norman Thiel
   for reporting a wrong URL path in m3u playlists
+
+vel_tins
+  for reporting that externremux x264 uses value of ABR for VBR
+  for various suggestions to improve externremux.sh
+
+Matthias Prill
+  for reporting a compiler error with older libstdc++ versions
+
+Timothy D. Lenz
+  for reporting missing support for invisible channel groups in HTTP menu
+
+Rainer Blickle
+  for reporting that channel switches may interrupt live TV on the server
diff --git a/HISTORY b/HISTORY
index 3ca77bc..9cdc58d 100644
--- a/HISTORY
+++ b/HISTORY
@@ -1,6 +1,44 @@
 VDR Plugin 'streamdev' Revision History
 ---------------------------------------
  
+- VTP no longer uses a static priority value for its server-side receivers.
+  The server stores channel and priority requested with the PROV command and
+  re-uses these values in a subsequent TUNE for the same channel. The new
+  PRIO command is used to update the receiver's priority if necessary.
+- added parameter HEIGHT to externremux.sh
+- fixed syslog messages reporting local instead of remote IP and port
+- fixed regression of the GetDevice(...) change. Filter streaming to clients
+  with a recent VDR version no longer worked.
+- log an error if externremux.sh is missing or not executable
+- since VDR 1.5.0 cDevice::GetDevice(...) is no longer a query only method.
+  It detaches all receivers of the device it returns. So it is no longer
+  suitable for testing the availability of a device. Added a copy of VDR's
+  cDevice::GetDevice(...) without the detach receivers part as a workaround
+  until a better solution is available
+- added dsyslog messages to help troubleshouting channel switch issues
+- VTP command SUSP didn't attach the player to the primary device
+- fixed incompatibilities with older make versions
+- replacing a connections receiver is now an atomic operation. Solves
+  stuttering audio/video due to lost TS packets when adding/removing PIDs
+- disabled attribute warn_unused_result in libdvbmpeg
+- slightly increased thread priorities of cStreamdevWriter/Streamer
+  (suggested by Rolf Ahrenberg)
+- fixed missing support for invisible channel groups (groups without name)
+  in HTTP menu (reported by Timothy D. Lenz)
+- don't quote actual program call in externremux.sh, so you can run the
+  program through e.g. nice or taskset just by extending the variable
+  which holds the program name
+- in externremux.sh each mencoder audio and video codec has a dedicated
+  variable for a default option string now. Still you can override each
+  default option with an URL parameter
+- externremux.sh mencoder now uses scale parameter with negative height
+  instead of -xy for scaling (suggested by vel_tins@vdrportal)
+- added FPS (frames per second) parameter to externremux.sh (suggested by
+  vel_tins@vdrportal)
+- don't use std::map.at(). It's not available in older libstdc++ version
+  (reported by Matthias Prill)
+- fixed extremux x264 using value of ABR for VBR (thanks to vel_tins@vdrportal)
+
 2010-07-20: Version 0.5.0b
 
 - fixed wrong URL path in m3u playlists (reported by Norman Thiel)
diff --git a/Makefile b/Makefile
index 2ead512..b375844 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 #
 # Makefile for a Video Disk Recorder plugin
 #
-# $Id: Makefile,v 1.22 2010/07/19 13:49:24 schmirl Exp $
+# $Id: Makefile,v 1.23 2010/08/02 10:36:59 schmirl Exp $
 
 # The main source file name.
 #
@@ -35,7 +35,8 @@ TSPLAYVERSNUM = $(shell grep 'define TSPLAY_PATCH_VERSION ' $(VDRDIR)/device.h |
 
 ifeq ($(shell test $(APIVERSNUM) -ge 10713; echo $$?),0)
 include $(VDRDIR)/Make.global
-else ifeq ($(shell test $(APIVERSNUM) -ge 10704 -o -n "$(TSPLAYVERSNUM)" ; echo $$?),0)
+else
+ifeq ($(shell test $(APIVERSNUM) -ge 10704 -o -n "$(TSPLAYVERSNUM)" ; echo $$?),0)
 DEFINES  += -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
 CFLAGS   += -fPIC
 CXXFLAGS += -fPIC
@@ -43,13 +44,14 @@ else
 CFLAGS   += -fPIC
 CXXFLAGS += -fPIC
 endif
+endif
 
 -include $(VDRDIR)/Make.config
 
 ### export all vars for sub-makes, using absolute paths
 
-VDRDIR := $(abspath $(VDRDIR))
-LIBDIR := $(abspath $(LIBDIR))
+VDRDIR := $(shell cd $(VDRDIR) >/dev/null 2>&1 && pwd)
+LIBDIR := $(shell cd $(LIBDIR) >/dev/null 2>&1 && pwd)
 export
 unexport PLUGIN
 
diff --git a/client/device.c b/client/device.c
index d53bde1..fb80107 100644
--- a/client/device.c
+++ b/client/device.c
@@ -1,5 +1,5 @@
 /*
- *  $Id: device.c,v 1.26 2010/06/08 05:55:17 schmirl Exp $
+ *  $Id: device.c,v 1.27 2010/08/18 10:26:55 schmirl Exp $
  */
  
 #include "client/device.h"
@@ -8,6 +8,7 @@
 
 #include "tools/select.h"
 
+#include <vdr/config.h>
 #include <vdr/channels.h>
 #include <vdr/ringbuffer.h>
 #include <vdr/eit.h>
@@ -32,6 +33,7 @@ cStreamdevDevice::cStreamdevDevice(void) {
 
 	m_Device = this;
 	m_Pids = 0;
+	m_Priority = -1;
 	m_DvrClosed = true;
 }
 
@@ -107,7 +109,7 @@ bool cStreamdevDevice::ProvidesChannel(const cChannel *Channel, int Priority,
 		res = prio && ClientSocket.ProvidesChannel(Channel, Priority);
 		ndr = true;
 	}
-	
+
 	if (NeedsDetachReceivers)
 		*NeedsDetachReceivers = ndr;
 	Dprintf("prov res = %d, ndr = %d\n", res, ndr);
@@ -118,6 +120,9 @@ bool cStreamdevDevice::SetChannelDevice(const cChannel *Channel,
 		bool LiveView) {
 	Dprintf("SetChannelDevice Channel: %s, LiveView: %s\n", Channel->Name(),
 			LiveView ? "true" : "false");
+	LOCK_THREAD;
+
+	m_UpdatePriority = ClientSocket.SupportsPrio();
 
 	if (LiveView)
 		return false;
@@ -140,6 +145,8 @@ bool cStreamdevDevice::SetPid(cPidHandle *Handle, int Type, bool On) {
 			Handle->used);
 	LOCK_THREAD;
 
+	m_UpdatePriority = ClientSocket.SupportsPrio();
+
 	if (On && !m_TSBuffer) {
 		Dprintf("SetPid: no data connection -> OpenDvr()");
 		OpenDvrInt();
@@ -301,3 +308,16 @@ bool cStreamdevDevice::ReInit(void) {
 	return StreamdevClientSetup.StartClient ? Init() : true;
 }
 
+void cStreamdevDevice::UpdatePriority(void) {
+	if (m_Device) {
+		m_Device->Lock();
+		if (m_Device->m_UpdatePriority && ClientSocket.DataSocket(siLive)) {
+			int Priority = m_Device->Priority();
+			if (m_Device == cDevice::ActualDevice() && Priority < Setup.PrimaryLimit)
+				Priority = Setup.PrimaryLimit;
+			if (m_Device->m_Priority != Priority && ClientSocket.SetPriority(Priority))
+				m_Device->m_Priority = Priority;
+		}
+		m_Device->Unlock();
+	}
+}
diff --git a/client/device.h b/client/device.h
index e96b05f..b2eed70 100644
--- a/client/device.h
+++ b/client/device.h
@@ -1,5 +1,5 @@
 /*
- *  $Id: device.h,v 1.9 2009/06/23 10:26:54 schmirl Exp $
+ *  $Id: device.h,v 1.10 2010/08/18 10:26:55 schmirl Exp $
  */
  
 #ifndef VDR_STREAMDEV_DEVICE_H
@@ -15,13 +15,14 @@ class cTBString;
 #define CMD_LOCK_OBJ(x) cMutexLock CmdLock((cMutex*)&(x)->m_Mutex)
 
 class cStreamdevDevice: public cDevice {
-	friend class cRemoteRecordings;
 
 private:
 	const cChannel      *m_Channel;
 	cTSBuffer           *m_TSBuffer;
 	cStreamdevFilters   *m_Filters;
 	int                  m_Pids;
+	int                  m_Priority;
+	bool                 m_UpdatePriority;
 	bool                 m_DvrClosed;
 
 	static cStreamdevDevice *m_Device;
@@ -59,6 +60,7 @@ public:
 #endif
 	virtual bool IsTunedToTransponder(const cChannel *Channel);
 
+	static void UpdatePriority(void);
 	static bool Init(void);
 	static bool ReInit(void);
 
diff --git a/client/socket.c b/client/socket.c
index bd2f9ba..0e8974f 100644
--- a/client/socket.c
+++ b/client/socket.c
@@ -1,5 +1,5 @@
 /*
- *  $Id: socket.c,v 1.13 2010/06/08 05:55:17 schmirl Exp $
+ *  $Id: socket.c,v 1.15 2010/08/18 10:26:55 schmirl Exp $
  */
  
 #include <tools/select.h>
@@ -20,6 +20,7 @@ cClientSocket ClientSocket;
 cClientSocket::cClientSocket(void) 
 {
 	memset(m_DataSockets, 0, sizeof(cTBSocket*) * si_Count);
+	m_Prio = false;
 	Reset();
 }
 
@@ -142,8 +143,14 @@ bool cClientSocket::CheckConnection(void) {
 	if(Command("CAPS FILTERS", 220))
 		Filters = ",FILTERS";
 
-	isyslog("Streamdev: Connected to server %s:%d using capabilities TSPIDS%s",
-	        RemoteIp().c_str(), RemotePort(), Filters);
+	const char *Prio = "";
+	if(Command("CAPS PRIO", 220)) {
+		Prio = ",PRIO";
+		m_Prio = true;
+	}
+
+	isyslog("Streamdev: Connected to server %s:%d using capabilities TSPIDS%s%s",
+	        RemoteIp().c_str(), RemotePort(), Filters, Prio);
 	return true;
 }
 
@@ -241,7 +248,7 @@ bool cClientSocket::SetChannelDevice(const cChannel *Channel) {
 	CMD_LOCK;
 
 	std::string command = (std::string)"TUNE " 
-	                    + (const char*)Channel->GetChannelID().ToString();
+				+ (const char*)Channel->GetChannelID().ToString();
 	if (!Command(command, 220)) {
 		if (errno == 0)
 			esyslog("ERROR: Streamdev: Couldn't tune %s:%d to channel %s",
@@ -251,6 +258,21 @@ bool cClientSocket::SetChannelDevice(const cChannel *Channel) {
 	return true;
 }
 
+bool cClientSocket::SetPriority(int Priority) {
+	if (!CheckConnection()) return false;
+
+	CMD_LOCK;
+
+	std::string command = (std::string)"PRIO " + (const char*)itoa(Priority);
+	if (!Command(command, 220)) {
+		if (errno == 0)
+			esyslog("Streamdev: Failed to update priority on %s:%d", RemoteIp().c_str(), 
+			        RemotePort());
+		return false;
+	}
+	return true;
+}
+
 bool cClientSocket::SetPid(int Pid, bool On) {
 	if (!CheckConnection()) return false;
 
@@ -259,8 +281,8 @@ bool cClientSocket::SetPid(int Pid, bool On) {
 	std::string command = (std::string)(On ? "ADDP " : "DELP ") + (const char*)itoa(Pid);
 	if (!Command(command, 220)) {
 		if (errno == 0)
-			esyslog("Streamdev: Pid %d not available from %s:%d", Pid, LocalIp().c_str(), 
-			        LocalPort());
+			esyslog("Streamdev: Pid %d not available from %s:%d", Pid, RemoteIp().c_str(), 
+			        RemotePort());
 		return false;
 	}
 	return true;
@@ -276,7 +298,7 @@ bool cClientSocket::SetFilter(ushort Pid, uchar Tid, uchar Mask, bool On) {
 	if (!Command(command, 220)) {
 		if (errno == 0)
 				esyslog("Streamdev: Filter %hu, %hhu, %hhu not available from %s:%d", 
-						Pid, Tid, Mask, LocalIp().c_str(), LocalPort());
+						Pid, Tid, Mask, RemoteIp().c_str(), RemotePort());
 		return false;
 	}
 	return true;
diff --git a/client/socket.h b/client/socket.h
index 7ad9a80..1197678 100644
--- a/client/socket.h
+++ b/client/socket.h
@@ -1,5 +1,5 @@
 /*
- *  $Id: socket.h,v 1.7 2010/06/08 05:55:17 schmirl Exp $
+ *  $Id: socket.h,v 1.8 2010/08/18 10:26:55 schmirl Exp $
  */
  
 #ifndef VDR_STREAMDEV_CLIENT_CONNECTION_H
@@ -20,6 +20,7 @@ private:
 	cTBSocket    *m_DataSockets[si_Count];
 	cMutex        m_Mutex;
 	char          m_Buffer[BUFSIZ + 1]; // various uses
+	bool          m_Prio; // server supports command PRIO
 
 protected:
 	/* Send Command, and return true if the command results in Expected. 
@@ -45,6 +46,8 @@ public:
 	bool CreateDataConnection(eSocketId Id);
 	bool CloseDataConnection(eSocketId Id);
 	bool SetChannelDevice(const cChannel *Channel);
+	bool SupportsPrio() { return m_Prio; }
+	bool SetPriority(int Priority);
 	bool SetPid(int Pid, bool On);
 	bool SetFilter(ushort Pid, uchar Tid, uchar Mask, bool On);
 	bool CloseDvr(void);
diff --git a/client/streamdev-client.c b/client/streamdev-client.c
index b03fbbe..00fa90c 100644
--- a/client/streamdev-client.c
+++ b/client/streamdev-client.c
@@ -3,7 +3,7 @@
  *
  * See the README file for copyright information and how to reach the author.
  *
- * $Id: streamdev-client.c,v 1.2 2010/07/19 13:49:25 schmirl Exp $
+ * $Id: streamdev-client.c,v 1.3 2010/08/18 10:26:56 schmirl Exp $
  */
 
 #include "streamdev-client.h"
@@ -52,4 +52,8 @@ bool cPluginStreamdevClient::SetupParse(const char *Name, const char *Value) {
   return StreamdevClientSetup.SetupParse(Name, Value);
 }
 
+void cPluginStreamdevClient::MainThreadHook(void) {
+  cStreamdevDevice::UpdatePriority();
+}
+
 VDRPLUGINCREATOR(cPluginStreamdevClient); // Don't touch this!
diff --git a/client/streamdev-client.h b/client/streamdev-client.h
index 0972dcc..1885ed1 100644
--- a/client/streamdev-client.h
+++ b/client/streamdev-client.h
@@ -1,5 +1,5 @@
 /*
- *  $Id: streamdev-client.h,v 1.2 2010/07/19 13:49:25 schmirl Exp $
+ *  $Id: streamdev-client.h,v 1.3 2010/08/18 10:26:56 schmirl Exp $
  */
  
 #ifndef VDR_STREAMDEVCLIENT_H
@@ -23,6 +23,7 @@ public:
   virtual cOsdObject *MainMenuAction(void);
   virtual cMenuSetupPage *SetupMenu(void);
   virtual bool SetupParse(const char *Name, const char *Value);
+  virtual void MainThreadHook(void);
 };
 
 #endif // VDR_STREAMDEVCLIENT_H
diff --git a/common.c b/common.c
index 3ad290b..47898aa 100644
--- a/common.c
+++ b/common.c
@@ -10,7 +10,7 @@
 
 using namespace std;
 
-const char *VERSION = "0.5.0";
+const char *VERSION = "0.5.0-CVS";
 
 const char cMenuEditIpItem::IpCharacters[] = "0123456789.";
 
diff --git a/libdvbmpeg/Makefile b/libdvbmpeg/Makefile
index 71e1c5d..4a78a12 100644
--- a/libdvbmpeg/Makefile
+++ b/libdvbmpeg/Makefile
@@ -1,12 +1,16 @@
 #
 # Makefile for a Video Disk Recorder plugin
 #
-# $Id: Makefile,v 1.4 2010/07/19 13:49:26 schmirl Exp $
+# $Id: Makefile,v 1.5 2010/07/30 10:49:28 schmirl Exp $
 
 ### The object files (add further files here):
 
 OBJS = ctools.o remux.o ringbuffy.o transform.o
 
+### Disable attribute warn_unused_result
+
+DEFINES += -U_FORTIFY_SOURCE
+
 ### The main target:
 
 .PHONY: clean
diff --git a/remux/extern.c b/remux/extern.c
index ce76883..cf766d3 100644
--- a/remux/extern.c
+++ b/remux/extern.c
@@ -151,7 +151,10 @@ cTSExt::cTSExt(cRingBufferLinear *ResultBuffer, const cServerConnection *Connect
 
 			// look for section parameters: /path;param1=value1;param2=value2/
 			std::string::size_type begin, end;
-			std::string path = Connection->Headers().at("PATH_INFO");
+			const static std::string PATH_INFO("PATH_INFO");
+
+			tStrStrMap::const_iterator it_pathinfo = Connection->Headers().find(PATH_INFO);
+			const std::string& path = it_pathinfo == Connection->Headers().end() ? "/" : it_pathinfo->second;
 			begin = path.find(';', 0);
 			begin = path.find_first_not_of(';', begin);
 			end = path.find_first_of(";/", begin);
@@ -188,6 +191,11 @@ cTSExt::cTSExt(cRingBufferLinear *ResultBuffer, const cServerConnection *Connect
 		if (setpgid(0, 0) == -1)
 			esyslog("streamdev-server: externremux setpgid failed: %m");
 
+		if (access(opt_remux, X_OK) == -1) {
+			esyslog("streamdev-server %s: %m", opt_remux);
+			_exit(-1);
+		}
+
 		if (execle("/bin/sh", "sh", "-c", opt_remux, NULL, env) == -1) {
 			esyslog("streamdev-server: externremux script '%s' execution failed: %m", opt_remux);
 			_exit(-1);
diff --git a/server/connection.c b/server/connection.c
index 956c42a..2ba99f3 100644
--- a/server/connection.c
+++ b/server/connection.c
@@ -1,5 +1,5 @@
 /*
- *  $Id: connection.c,v 1.14 2010/07/19 13:49:31 schmirl Exp $
+ *  $Id: connection.c,v 1.16 2010/08/03 10:51:53 schmirl Exp $
  */
  
 #include "server/connection.h"
@@ -8,6 +8,7 @@
 #include "common.h"
 
 #include <vdr/tools.h>
+#include <vdr/transfer.h>
 #include <string.h>
 #include <stdarg.h>
 #include <errno.h>
@@ -184,75 +185,172 @@ bool cServerConnection::Respond(const char *Message, bool Last, ...)
 	m_Pending = !Last;
 	return true;
 }
-	
+
+#if APIVERSNUM >= 10700
+static int GetClippedNumProvidedSystems(int AvailableBits, cDevice *Device)
+{
+  int MaxNumProvidedSystems = 1 << AvailableBits;
+  int NumProvidedSystems = Device->NumProvidedSystems();
+  if (NumProvidedSystems > MaxNumProvidedSystems) {
+     esyslog("ERROR: device %d supports %d modulation systems but cDevice::GetDevice() currently only supports %d delivery systems which should be fixed", Device->CardIndex() + 1, NumProvidedSystems, MaxNumProvidedSystems);
+     NumProvidedSystems = MaxNumProvidedSystems;
+     }
+  else if (NumProvidedSystems <= 0) {
+     esyslog("ERROR: device %d reported an invalid number (%d) of supported delivery systems - assuming 1", Device->CardIndex() + 1, NumProvidedSystems);
+     NumProvidedSystems = 1;
+     }
+  return NumProvidedSystems;
+}
+#endif
+
+/*
+ * copy of cDevice::GetDevice(...) but without side effects (not detaching receivers)
+ */
+cDevice* cServerConnection::CheckDevice(const cChannel *Channel, int Priority, bool LiveView, const cDevice *AvoidDevice)
+{
+  //cDevice *AvoidDevice = avoidDevice;
+  //avoidDevice = NULL;
+  // Collect the current priorities of all CAM slots that can decrypt the channel:
+  int NumCamSlots = CamSlots.Count();
+  int SlotPriority[NumCamSlots];
+  int NumUsableSlots = 0;
+  if (Channel->Ca() >= CA_ENCRYPTED_MIN) {
+     for (cCamSlot *CamSlot = CamSlots.First(); CamSlot; CamSlot = CamSlots.Next(CamSlot)) {
+         SlotPriority[CamSlot->Index()] = MAXPRIORITY + 1; // assumes it can't be used
+         if (CamSlot->ModuleStatus() == msReady) {
+            if (CamSlot->ProvidesCa(Channel->Caids())) {
+               if (!ChannelCamRelations.CamChecked(Channel->GetChannelID(), CamSlot->SlotNumber())) {
+                  SlotPriority[CamSlot->Index()] = CamSlot->Priority();
+                  NumUsableSlots++;
+                  }
+               }
+            }
+         }
+     if (!NumUsableSlots)
+        return NULL; // no CAM is able to decrypt this channel
+     }
+
+  bool NeedsDetachReceivers = false;
+  cDevice *d = NULL;
+  //cCamSlot *s = NULL;
+
+  uint32_t Impact = 0xFFFFFFFF; // we're looking for a device with the least impact
+  for (int j = 0; j < NumCamSlots || !NumUsableSlots; j++) {
+      if (NumUsableSlots && SlotPriority[j] > MAXPRIORITY)
+         continue; // there is no CAM available in this slot
+      for (int i = 0; i < cDevice::NumDevices(); i++) {
+          cDevice *device = cDevice::GetDevice(i);
+          if (device == AvoidDevice)
+             continue; // we've been asked to skip this device
+          if (Channel->Ca() && Channel->Ca() <= CA_DVB_MAX && Channel->Ca() != device->CardIndex() + 1)
+             continue; // a specific card was requested, but not this one
+          if (NumUsableSlots && !CamSlots.Get(j)->Assign(device, true))
+             continue; // CAM slot can't be used with this device
+          bool ndr;
+          if (device->ProvidesChannel(Channel, Priority, &ndr)) { // this device is basicly able to do the job
+             if (NumUsableSlots && device->CamSlot() && device->CamSlot() != CamSlots.Get(j))
+                ndr = true; // using a different CAM slot requires detaching receivers
+             // Put together an integer number that reflects the "impact" using
+             // this device would have on the overall system. Each condition is represented
+             // by one bit in the number (or several bits, if the condition is actually
+             // a numeric value). The sequence in which the conditions are listed corresponds
+             // to their individual severity, where the one listed first will make the most
+             // difference, because it results in the most significant bit of the result.
+             uint32_t imp = 0;
+             imp <<= 1; imp |= LiveView ? !device->IsPrimaryDevice() || ndr : 0;                                  // prefer the primary device for live viewing if we don't need to detach existing receivers
+             imp <<= 1; imp |= !device->Receiving() && (device != cTransferControl::ReceiverDevice() || device->IsPrimaryDevice()) || ndr; // use receiving devices if we don't need to detach existing receivers, but avoid primary device in local transfer mode
+             imp <<= 1; imp |= device->Receiving();                                                               // avoid devices that are receiving
+#if APIVERSNUM >= 10700
+             imp <<= 2; imp |= GetClippedNumProvidedSystems(2, device) - 1;                                       // avoid cards which support multiple delivery systems
+#endif
+             imp <<= 1; imp |= device == cTransferControl::ReceiverDevice();                                      // avoid the Transfer Mode receiver device
+             imp <<= 8; imp |= min(max(device->Priority() + MAXPRIORITY, 0), 0xFF);                               // use the device with the lowest priority (+MAXPRIORITY to assure that values -99..99 can be used)
+             imp <<= 8; imp |= min(max((NumUsableSlots ? SlotPriority[j] : 0) + MAXPRIORITY, 0), 0xFF);              // use the CAM slot with the lowest priority (+MAXPRIORITY to assure that values -99..99 can be used)
+             imp <<= 1; imp |= ndr;                                                                                  // avoid devices if we need to detach existing receivers
+             imp <<= 1; imp |= device->IsPrimaryDevice();                                                         // avoid the primary device
+             imp <<= 1; imp |= NumUsableSlots ? 0 : device->HasCi();                                              // avoid cards with Common Interface for FTA channels
+             imp <<= 1; imp |= device->HasDecoder();                                                              // avoid full featured cards
+             imp <<= 1; imp |= NumUsableSlots ? !ChannelCamRelations.CamDecrypt(Channel->GetChannelID(), j + 1) : 0; // prefer CAMs that are known to decrypt this channel
+             if (imp < Impact) {
+                // This device has less impact than any previous one, so we take it.
+                Impact = imp;
+                d = device;
+                NeedsDetachReceivers = ndr;
+                }
+             }
+          }
+      if (!NumUsableSlots)
+         break; // no CAM necessary, so just one loop over the devices
+      }
+  return d;
+}
+
 cDevice *cServerConnection::GetDevice(const cChannel *Channel, int Priority) 
 {
-	cDevice *device = NULL;
+	const cChannel *current = Channels.GetByNumber(cDevice::CurrentChannel());
 
-	/*Dprintf("+ Statistics:\n");
-	Dprintf("+ Current Channel: %d\n", cDevice::CurrentChannel());
-	Dprintf("+ Current Device: %d\n", cDevice::ActualDevice()->CardIndex());
-	Dprintf("+ Transfer Mode: %s\n", cDevice::ActualDevice() 
-			== cDevice::PrimaryDevice() ? "false" : "true");
-	Dprintf("+ Replaying: %s\n", cDevice::PrimaryDevice()->Replaying() ? "true"
-			: "false");*/
+	// turn off the streams of this connection
+	Detach();
+	// This call may detach receivers of the device it returns
+	cDevice *device = cDevice::GetDevice(Channel, Priority, false);
 
-	Dprintf(" * GetDevice(const cChannel*, int)\n");
-	Dprintf(" * -------------------------------\n");
-
-	device = cDevice::GetDevice(Channel, Priority, false);
-
-	Dprintf(" * Found following device: %p (%d)\n", device, 
-			device ? device->CardIndex() + 1 : 0);
-	if (device == cDevice::ActualDevice())
-		Dprintf(" * is actual device\n");
-	if (!cSuspendCtl::IsActive() && StreamdevServerSetup.SuspendMode != smAlways)
-		Dprintf(" * NOT suspended\n");
-	
-	if (!device || (device == cDevice::ActualDevice() 
+ 	if (device && device == cDevice::ActualDevice()
 			&& !cSuspendCtl::IsActive() 
-			&& StreamdevServerSetup.SuspendMode != smAlways)) {
-		// mustn't switch actual device
-		// maybe a device would be free if THIS connection did turn off its streams?
-		Dprintf(" * trying again...\n");
-		const cChannel *current = Channels.GetByNumber(cDevice::CurrentChannel());
-		isyslog("streamdev-server: Detaching current receiver");
-		Detach();
-		device = cDevice::GetDevice(Channel, Priority, false);
-		Attach();
-		Dprintf(" * Found following device: %p (%d)\n", device, 
-				device ? device->CardIndex() + 1 : 0);
-		if (device == cDevice::ActualDevice())
-			Dprintf(" * is actual device\n");
-		if (!cSuspendCtl::IsActive() 
-				&& StreamdevServerSetup.SuspendMode != smAlways)
-			Dprintf(" * NOT suspended\n");
-		if (current && !TRANSPONDER(Channel, current))
-			Dprintf(" * NOT same transponder\n");
-		if (device && (device == cDevice::ActualDevice()
-				&& !cSuspendCtl::IsActive()
-				&& StreamdevServerSetup.SuspendMode != smAlways
-				&& current != NULL
-				&& !TRANSPONDER(Channel, current))) {
-			// now we would have to switch away live tv...let's see if live tv
-			// can be handled by another device
-			cDevice *newdev = NULL;
-			for (int i = 0; i < cDevice::NumDevices(); ++i) {
-				cDevice *dev = cDevice::GetDevice(i);
-				if (dev->ProvidesChannel(current, 0) && dev != device) {
-					newdev = dev;
-					break;
-				}
-			}
-			Dprintf(" * Found device for live tv: %p (%d)\n", newdev,
-					newdev ? newdev->CardIndex() + 1 : 0);
-			if (newdev == NULL || newdev == device)
-				// no suitable device to continue live TV, giving up...
-				device = NULL;
-			else
-				newdev->SwitchChannel(current, true);
-		}
+			&& StreamdevServerSetup.SuspendMode != smAlways
+			&& current != NULL
+			&& !TRANSPONDER(Channel, current)) {
+		// now we would have to switch away live tv...let's see if live tv
+		// can be handled by another device
+#if VDRVERSNUM >= 10516
+		cDevice::SetAvoidDevice(device);
+		cDevice *newdev = cDevice::GetDevice(current, 0, true);
+#else
+		cDevice *newdev = CheckDevice(current, 0, true, device);
+#endif
+		if (newdev)
+			newdev->SwitchChannel(current, true);
+		else
+			device = NULL;
 	}
 
+	if (!device) {
+		// can't switch - continue the current stream
+		Attach();
+		dsyslog("streamdev: GetDevice failed for channel %s at priority %d", Channel->Name(), Priority);
+	}
+	return device;
+}
+
+bool cServerConnection::ProvidesChannel(const cChannel *Channel, int Priority) 
+{
+	const cChannel *current = Channels.GetByNumber(cDevice::CurrentChannel());
+
+	cDevice *device = CheckDevice(Channel, Priority, false);
+	if (!device || (device == cDevice::ActualDevice()
+			&& !cSuspendCtl::IsActive()
+			&& StreamdevServerSetup.SuspendMode != smAlways
+			&& current != NULL
+			&& !TRANSPONDER(Channel, current))) {
+		// mustn't switch actual device
+		// maybe a device would be free if THIS connection did turn off its streams?
+		Detach();
+		device = CheckDevice(Channel, Priority, false);
+		Attach();
+		if (device && device == cDevice::ActualDevice()
+				&& !cSuspendCtl::IsActive() 
+				&& StreamdevServerSetup.SuspendMode != smAlways
+				&& current != NULL
+				&& !TRANSPONDER(Channel, current)) {
+			// now we would have to switch away live tv...let's see if live tv
+			// can be handled by another device
+			cDevice *newdev = CheckDevice(current, 0, true, device);
+			if (!newdev) {
+				device = NULL;
+				dsyslog("streamdev: Not providing channel %s at priority %d - live TV not suspended", Channel->Name(), Priority);
+			}
+		}
+		else if (!device)
+			dsyslog("streamdev: No device provides channel %s at priority %d", Channel->Name(), Priority);
+	}
 	return device;
 }
diff --git a/server/connection.h b/server/connection.h
index ff5ee98..22301b1 100644
--- a/server/connection.h
+++ b/server/connection.h
@@ -1,5 +1,5 @@
 /*
- *  $Id: connection.h,v 1.9 2010/07/19 13:49:31 schmirl Exp $
+ *  $Id: connection.h,v 1.10 2010/08/03 10:46:41 schmirl Exp $
  */
  
 #ifndef VDR_STREAMDEV_SERVER_CONNECTION_H
@@ -35,6 +35,11 @@ private:
 
 	tStrStrMap  m_Headers;
 
+	/* Check if a device would be available for transfering the given
+	   channel. This call has no side effects except for temporarily
+           detaching this connection's receivers. */
+	cDevice *CheckDevice(const cChannel *Channel, int Priority, bool LiveView, const cDevice *AvoidDevice = NULL);
+
 protected:
 	/* Will be called when a command terminated by a newline has been 
 	   received */
@@ -91,10 +96,14 @@ public:
 	/* Will make the socket close after sending all queued output data */
 	void DeferClose(void) { m_DeferClose = true; }
 
-	/* Will retrieve an unused device for transmitting data. Use the returned
+	/* Will retrieve an unused device for transmitting data. Receivers have
+	   already been attached from the device if necessary. Use the returned
 	   cDevice in a following call to StartTransfer */
 	cDevice *GetDevice(const cChannel *Channel, int Priority);
 
+	/* Test if a call to GetDevice would return a usable device. */
+	bool ProvidesChannel(const cChannel *Channel, int Priority);
+
 	virtual void Flushed(void) {}
 
 	virtual void Detach(void) = 0;
diff --git a/server/connectionHTTP.c b/server/connectionHTTP.c
index 028b9ea..54ccf5a 100644
--- a/server/connectionHTTP.c
+++ b/server/connectionHTTP.c
@@ -1,5 +1,5 @@
 /*
- *  $Id: connectionHTTP.c,v 1.19 2010/07/20 12:26:29 schmirl Exp $
+ *  $Id: connectionHTTP.c,v 1.21 2010/08/03 10:46:41 schmirl Exp $
  */
 
 #include <ctype.h>
@@ -140,11 +140,18 @@ bool cConnectionHTTP::ProcessRequest(void)
 		}
 	}
 
-	if (Headers().at(REQUEST_METHOD).compare("GET") == 0 && ProcessURI(Headers().at(PATH_INFO))) {
+	tStrStrMap::const_iterator it_method = Headers().find(REQUEST_METHOD);
+	tStrStrMap::const_iterator it_pathinfo = Headers().find(PATH_INFO);
+	if (it_method == Headers().end() || it_pathinfo == Headers().end()) {
+		// should never happen
+		esyslog("streamdev-server connectionHTTP: Missing method or pathinfo");
+	} else if (it_method->second.compare("GET") == 0 && ProcessURI(it_pathinfo->second)) {
 		if (m_ChannelList)
 			return Respond("%s", true, m_ChannelList->HttpHeader().c_str());
 		else if (m_Channel != NULL) {
-			cDevice *device = GetDevice(m_Channel, 0);
+			cDevice *device = NULL;
+			if (ProvidesChannel(m_Channel, 0))
+				device = GetDevice(m_Channel, 0);
 			if (device != NULL) {
 				device->SwitchChannel(m_Channel, false);
 				m_LiveStreamer = new cStreamdevLiveStreamer(0, this);
@@ -176,13 +183,12 @@ bool cConnectionHTTP::ProcessRequest(void)
 			return Respond("HTTP/1.0 404 not found")
 				&& Respond("");
 		}
-	} else if (Headers().at(REQUEST_METHOD).compare("HEAD") == 0 && ProcessURI(Headers().at(PATH_INFO))) {
+	} else if (it_method->second.compare("HEAD") == 0 && ProcessURI(it_pathinfo->second)) {
 		DeferClose();
 		if (m_ChannelList)
 			return Respond("%s", true, m_ChannelList->HttpHeader().c_str());
 		else if (m_Channel != NULL) {
-			cDevice *device = GetDevice(m_Channel, 0);
-			if (device != NULL) {
+			if (ProvidesChannel(m_Channel, 0)) {
 				if (m_StreamType == stEXT) {
 					// TODO
 					return Respond("HTTP/1.0 200 OK")
@@ -249,7 +255,8 @@ cChannelList* cConnectionHTTP::ChannelListFromString(const std::string& Path, co
 	const static std::string QUERY_STRING("QUERY_STRING");
 	const static std::string HOST("HTTP_HOST");
 
-	const std::string query = Headers().at(QUERY_STRING);
+	tStrStrMap::const_iterator it_query = Headers().find(QUERY_STRING);
+	const std::string& query = it_query == Headers().end() ? "" : it_query->second;
 
 	std::string groupTarget;
 	cChannelIterator *iterator = NULL;
diff --git a/server/connectionIGMP.c b/server/connectionIGMP.c
index 50db15b..708f41c 100644
--- a/server/connectionIGMP.c
+++ b/server/connectionIGMP.c
@@ -1,5 +1,5 @@
 /*
- *  $Id: connectionIGMP.c,v 1.2 2010/07/19 13:49:31 schmirl Exp $
+ *  $Id: connectionIGMP.c,v 1.3 2010/08/03 10:46:41 schmirl Exp $
  */
 
 #include <ctype.h>
@@ -25,7 +25,9 @@ cConnectionIGMP::~cConnectionIGMP()
 bool cConnectionIGMP::Start(cChannel *Channel, in_addr_t Dst)
 {
 	if (Channel != NULL) {
-		cDevice *device = GetDevice(Channel, 0);
+		cDevice *device = NULL;
+		if (ProvidesChannel(Channel, 0))
+			device = GetDevice(Channel, 0);
 		if (device != NULL) {
 			device->SwitchChannel(Channel, false);
 			struct in_addr ip;
diff --git a/server/connectionVTP.c b/server/connectionVTP.c
index 861bc83..0f92db0 100644
--- a/server/connectionVTP.c
+++ b/server/connectionVTP.c
@@ -1,5 +1,5 @@
 /*
- *  $Id: connectionVTP.c,v 1.28 2010/07/19 13:49:31 schmirl Exp $
+ *  $Id: connectionVTP.c,v 1.31 2010/08/18 10:26:54 schmirl Exp $
  */
  
 #include "server/connectionVTP.h"
@@ -746,6 +746,8 @@ cConnectionVTP::cConnectionVTP(void):
 		m_StreamType(stTSPIDS),
 		m_FiltersSupport(false),
 		m_RecPlayer(NULL),
+		m_TuneChannel(NULL),
+		m_TunePriority(0),
 		m_LSTEHandler(NULL),
 		m_LSTCHandler(NULL),
 		m_LSTTHandler(NULL),
@@ -836,6 +838,7 @@ bool cConnectionVTP::Command(char *Cmd)
 	else if (strcasecmp(Cmd, "READ") == 0) return CmdREAD(param);
 	else if (strcasecmp(Cmd, "TUNE") == 0) return CmdTUNE(param);
 	else if (strcasecmp(Cmd, "PLAY") == 0) return CmdPLAY(param);
+	else if (strcasecmp(Cmd, "PRIO") == 0) return CmdPRIO(param);
 	else if (strcasecmp(Cmd, "ADDP") == 0) return CmdADDP(param);
 	else if (strcasecmp(Cmd, "DELP") == 0) return CmdDELP(param);
 	else if (strcasecmp(Cmd, "ADDF") == 0) return CmdADDF(param);
@@ -894,6 +897,11 @@ bool cConnectionVTP::CmdCAPS(char *Opts)
 		return Respond(220, "Capability \"%s\" accepted", Opts);
 	}
 
+	// Command PRIO is known
+	if (strcasecmp(Opts, "PRIO") == 0) {
+		return Respond(220, "Capability \"%s\" accepted", Opts);
+	}
+
 	return Respond(561, "Capability \"%s\" not known", Opts);
 }
 
@@ -911,9 +919,15 @@ bool cConnectionVTP::CmdPROV(char *Opts)
 	if ((chan = ChannelFromString(Opts)) == NULL)
 		return Respond(550, "Undefined channel \"%s\"", Opts);
 
-	return GetDevice(chan, prio) != NULL
-			? Respond(220, "Channel available")
-			: Respond(560, "Channel not available");
+	if (ProvidesChannel(chan, prio)) {
+		m_TuneChannel = chan;
+		m_TunePriority = prio;
+		return Respond(220, "Channel available");
+	}
+	else {
+		m_TuneChannel = NULL;
+		return Respond(560, "Channel not available");
+	}
 }
 
 bool cConnectionVTP::CmdPORT(char *Opts) 
@@ -1067,18 +1081,23 @@ bool cConnectionVTP::CmdTUNE(char *Opts)
 {
 	const cChannel *chan;
 	cDevice *dev;
+	int prio = m_TunePriority;
 	
 	if ((chan = ChannelFromString(Opts)) == NULL)
 		return Respond(550, "Undefined channel \"%s\"", Opts);
 
-	if ((dev = GetDevice(chan, 0)) == NULL)
+	if (chan != m_TuneChannel) {
+		esyslog("streamdev-server TUNE %s: Priority unknown - using 0", Opts);
+		prio = 0;
+	}
+	if ((dev = GetDevice(chan, prio)) == NULL)
 		return Respond(560, "Channel not available");
 
 	if (!dev->SwitchChannel(chan, false))
 		return Respond(560, "Channel not available");
 
 	delete m_LiveStreamer;
-	m_LiveStreamer = new cStreamdevLiveStreamer(1, this);
+	m_LiveStreamer = new cStreamdevLiveStreamer(prio, this);
 	m_LiveStreamer->SetChannel(chan, m_StreamType);
 	m_LiveStreamer->SetDevice(dev);
 	if(m_LiveSocket)
@@ -1119,6 +1138,22 @@ bool cConnectionVTP::CmdPLAY(char *Opts)
 	}
 }
 
+bool cConnectionVTP::CmdPRIO(char *Opts) 
+{
+	int prio;
+	char *end;
+
+	prio = strtoul(Opts, &end, 10);
+	if (end == Opts || (*end != '\0' && *end != ' '))
+		return Respond(500, "Use: PRIO Priority");
+
+	if (m_LiveStreamer) {
+		m_LiveStreamer->SetPriority(prio);
+		return Respond(220, "Priority changed to %d", prio);
+	}
+	return Respond(550, "Priority not applicable");
+}
+
 bool cConnectionVTP::CmdADDP(char *Opts) 
 {
 	int pid;
@@ -1243,6 +1278,7 @@ bool cConnectionVTP::CmdSUSP(void)
 	else if (StreamdevServerSetup.SuspendMode == smOffer 
 			&& StreamdevServerSetup.AllowSuspend) {
 		cControl::Launch(new cSuspendCtl);
+		cControl::Attach();
 		return Respond(220, "Server is suspended");
 	} else
 		return Respond(550, "Client may not suspend server");
diff --git a/server/connectionVTP.h b/server/connectionVTP.h
index b938fe6..ee842fe 100644
--- a/server/connectionVTP.h
+++ b/server/connectionVTP.h
@@ -31,6 +31,11 @@ private:
 	bool                    m_FiltersSupport;
 	RecPlayer              *m_RecPlayer;
 
+	// Priority is only known in PROV command
+	// Store in here for later use in TUNE call
+	const cChannel         *m_TuneChannel;
+	int                     m_TunePriority;
+
 	// Members adopted for SVDRP
 	cLSTEHandler *m_LSTEHandler;
 	cLSTCHandler *m_LSTCHandler;
@@ -59,6 +64,7 @@ public:
 	bool CmdREAD(char *Opts);
 	bool CmdTUNE(char *Opts);
 	bool CmdPLAY(char *Opts);
+	bool CmdPRIO(char *Opts);
 	bool CmdADDP(char *Opts);
 	bool CmdDELP(char *Opts);
 	bool CmdADDF(char *Opts);
diff --git a/server/livestreamer.c b/server/livestreamer.c
index 2b0065c..1286abd 100644
--- a/server/livestreamer.c
+++ b/server/livestreamer.c
@@ -289,7 +289,7 @@ void cStreamdevPatFilter::Process(u_short Pid, u_char Tid, const u_char *Data, i
 							if (written != TS_SIZE)
 								siBuffer.ReportOverflow(TS_SIZE - written);
 							if (pmtPid != prevPmtPid) {
-								m_Streamer->SetPids(pmtPid);
+								m_Streamer->SetPid(pmtPid, true);
 								Add(pmtPid, 0x02);
 								pmtVersion = -1;
 							}
@@ -434,17 +434,24 @@ bool cStreamdevLiveStreamer::SetPids(int Pid, const int *Pids1, const int *Pids2
 	return true;
 }
 
+void cStreamdevLiveStreamer::SetPriority(int Priority)
+{
+	m_Priority = Priority;
+	StartReceiver();
+}
+
 void cStreamdevLiveStreamer::StartReceiver(void)
 {
-	DELETENULL(m_Receiver);
-	if (m_NumPids > 0) {
+	if (m_Device != NULL && m_NumPids > 0 && IsRunning()) {
 		Dprintf("Creating Receiver to respect changed pids\n");
+		cReceiver *current = m_Receiver;
 		m_Receiver = new cStreamdevLiveReceiver(this, m_Channel->GetChannelID(), m_Priority, m_Pids);
-		if (IsRunning() && m_Device != NULL) {
-			Dprintf("Attaching new receiver\n");
-			Attach();
-		}
+		cThreadLock ThreadLock(m_Device);
+		Attach();
+		delete current;
 	}
+	else
+		DELETENULL(m_Receiver);
 }
 
 bool cStreamdevLiveStreamer::SetChannel(const cChannel *Channel, eStreamType StreamType, const int* Apid, const int *Dpid) 
@@ -631,12 +638,10 @@ void cStreamdevFilterStreamer::SetDevice(cDevice *Device)
 {
 	Dprintf("cStreamdevFilterStreamer::SetDevice()\n");
 	LOCK_THREAD;
-	if(Device != m_Device) {
-		Detach();
-		m_Device = Device;
-		//m_Channel = NULL;
-		Attach();
-	}
+	Detach();
+	m_Device = Device;
+	//m_Channel = NULL;
+	Attach();
 }
 
 bool cStreamdevFilterStreamer::SetFilter(u_short Pid, u_char Tid, u_char Mask, bool On) 
diff --git a/server/livestreamer.h b/server/livestreamer.h
index 283a395..71feb4c 100644
--- a/server/livestreamer.h
+++ b/server/livestreamer.h
@@ -38,6 +38,7 @@ public:
 	bool SetPid(int Pid, bool On);
 	bool SetPids(int Pid, const int *Pids1 = NULL, const int *Pids2 = NULL, const int *Pids3 = NULL);
 	bool SetChannel(const cChannel *Channel, eStreamType StreamType, const int* Apid = NULL, const int* Dpid = NULL);
+	void SetPriority(int Priority);
 	
 	virtual int Put(const uchar *Data, int Count);
 	virtual uchar *Get(int &Count);
diff --git a/server/menuHTTP.c b/server/menuHTTP.c
index 5fb5010..d7fb817 100644
--- a/server/menuHTTP.c
+++ b/server/menuHTTP.c
@@ -2,7 +2,7 @@
 #include "server/menuHTTP.h"
 
 //**************************** cChannelIterator **************
-cChannelIterator::cChannelIterator(cChannel *First): channel(First)
+cChannelIterator::cChannelIterator(const cChannel *First): channel(First)
 {}
 
 const cChannel* cChannelIterator::Next()
@@ -19,7 +19,7 @@ cListAll::cListAll(): cChannelIterator(Channels.First())
 const cChannel* cListAll::NextChannel(const cChannel *Channel)
 {
 	if (Channel)
-		Channel = Channels.Next(Channel);
+		Channel = SkipFakeGroups(Channels.Next(Channel));
 	return Channel;
 }
 
@@ -46,14 +46,19 @@ const cChannel* cListGroups::NextChannel(const cChannel *Channel)
 }
 //
 // ********************* cListGroup ****************
-cListGroup::cListGroup(const cChannel *Group): cChannelIterator((Group && Group->GroupSep() && Channels.Next(Group) && !Channels.Next(Group)->GroupSep()) ? Channels.Next(Group) : NULL)
+cListGroup::cListGroup(const cChannel *Group): cChannelIterator(GetNextChannelInGroup(Group))
 {}
 
+const cChannel* cListGroup::GetNextChannelInGroup(const cChannel *Channel)
+{
+	if (Channel)
+		Channel = SkipFakeGroups(Channels.Next(Channel));
+	return Channel && !Channel->GroupSep() ? Channel : NULL;
+}
+
 const cChannel* cListGroup::NextChannel(const cChannel *Channel)
 {
-	if (Channel)
-		Channel = Channels.Next(Channel);
-	return (Channel && !Channel->GroupSep()) ? Channel : NULL;
+	return GetNextChannelInGroup(Channel);
 }
 //
 // ********************* cListTree ****************
@@ -68,7 +73,7 @@ const cChannel* cListTree::NextChannel(const cChannel *Channel)
 	if (currentGroup == selectedGroup)
 	{
 		if (Channel)
-			Channel = Channels.Next(Channel);
+			Channel = SkipFakeGroups(Channels.Next(Channel));
 		if (Channel && Channel->GroupSep())
 			currentGroup = Channel;
 	}
diff --git a/server/menuHTTP.h b/server/menuHTTP.h
index cbd7b59..4ef6363 100644
--- a/server/menuHTTP.h
+++ b/server/menuHTTP.h
@@ -13,9 +13,10 @@ class cChannelIterator
 		const cChannel *channel;
 	protected:
 		virtual const cChannel* NextChannel(const cChannel *Channel) = 0;
+		static inline const cChannel* SkipFakeGroups(const cChannel *Channel);
 	public:
 		const cChannel* Next();
-		cChannelIterator(cChannel *First);
+		cChannelIterator(const cChannel *First);
 		virtual ~cChannelIterator() {};
 };
 
@@ -48,6 +49,8 @@ class cListGroups: public cChannelIterator
 
 class cListGroup: public cChannelIterator
 {
+	private:
+		static const cChannel* GetNextChannelInGroup(const cChannel *Channel);
 	protected:
 		virtual const cChannel* NextChannel(const cChannel *Channel);
 	public:
@@ -140,4 +143,11 @@ class cM3uChannelList: public cChannelList
 		virtual ~cM3uChannelList();
 };
 
+inline const cChannel* cChannelIterator::SkipFakeGroups(const cChannel* Group)
+{
+	while (Group && Group->GroupSep() && !*Group->Name())
+		Group = Channels.Next(Group);
+	return Group;
+}
+
 #endif
diff --git a/server/streamer.c b/server/streamer.c
index c92e7ee..ec7d3c3 100644
--- a/server/streamer.c
+++ b/server/streamer.c
@@ -1,5 +1,5 @@
 /*
- *  $Id: streamer.c,v 1.20 2010/07/19 13:49:32 schmirl Exp $
+ *  $Id: streamer.c,v 1.21 2010/07/30 10:01:11 schmirl Exp $
  */
  
 #include <vdr/ringbuffer.h>
@@ -46,6 +46,9 @@ void cStreamdevWriter::Action(void)
 	uchar *block = NULL;
 	int count, offset = 0;
 
+#if APIVERSNUM >= 10705
+	SetPriority(-3);
+#endif
 	sel.Clear();
 	sel.Add(*m_Socket, true);
 	while (Running()) {
@@ -149,6 +152,9 @@ void cStreamdevStreamer::Stop(void)
 
 void cStreamdevStreamer::Action(void) 
 {
+#if APIVERSNUM >= 10705
+	SetPriority(-3);
+#endif
 	while (Running()) {
 		int got;
 		uchar *block = m_RingBuffer->Get(got);
diff --git a/streamdev-server/externremux.sh b/streamdev-server/externremux.sh
index 21cc60d..20fda78 100755
--- a/streamdev-server/externremux.sh
+++ b/streamdev-server/externremux.sh
@@ -16,6 +16,8 @@
 # VBR    video bitrate (kbit)
 # VOPTS  custom video options
 # WIDTH  scale video to width
+# HEIGHT scale video to height
+# FPS    output frames per second
 # AC     audio codec
 # ABR    audio bitrate (kbit)
 # AOPTS  custom audio options
@@ -42,14 +44,22 @@ ABR_MONO=64
 ###
 # mencoder binary
 MENCODER=mencoder
+### video part
 # Default video codec (e.g. lavc/x264/copy)
 MENCODER_VC=lavc
+# Default video options if lavc is used (-ovc lavc -lavcopts ...)
+MENCODER_LAVC_VOPTS=vcodec=mpeg4
+# Default video options if x264 is used (-ovc x264 -x264encopts ...)
+MENCODER_X264_VOPTS=threads=auto
+### audio part
 # Default audio codec (e.g. lavc/mp3lame/faac/copy)
 MENCODER_AC=mp3lame
-# Default video codec if lavc is used (-ovc lavc -lavcopts vcodec=)
-MENCODER_LAVC_VC=mpeg4
-# Default audio codec if lavc is used (-oac lavc -lavcopts acodec=)
-MENCODER_LAVC_AC=mp2
+# Default audio options if lavc is used (-oac lavc -lavcopts ...)
+MENCODER_LAVC_AOPTS=acodec=mp2
+# Default audio options if mp3lame is used (-oac mp3lame -lameopts ...)
+MENCODER_LAME_AOPTS=
+# Default audio options if faac is used (-oac faac -faacopts ...)
+MENCODER_FAAC_AOPTS=
 ###
 ### MENCODER CONFIG END
 
@@ -63,6 +73,8 @@ OGG_SPEED=1
 OGG_VQUALITY=0
 # audioquality - higher value gives better quality but is slower (0..10)
 OGG_AQUALITY=0
+# aspect ratio used for scaling if only one of HEIGHT/WIDTH given (16/9 or 4/3)
+OGG_ASPECT='4 / 3'
 ###
 ### OGG CONFIG END
 
@@ -70,7 +82,19 @@ OGG_AQUALITY=0
 
 function hasOpt { echo "$1" | grep -q "\b${2}\b"; }
 
-function isNumeric() { echo "$@" | grep -q '^[0-9]\{1,\}$'; }
+# $1:    concatenation of already set option=value pairs
+# $2-$n: option=value pairs to be echod if the option is not present in $1
+function addOpts
+{
+	local opts="$1"
+	shift
+	while [ $# -gt 0 ]; do
+		hasOpt "$opts" ${1%%=*}= || echo $1
+		shift
+	done
+}
+
+function isNumeric() { echo "$@" | grep -q '^-\?[0-9]\{1,\}$'; }
 
 function remux_cat
 {
@@ -87,21 +111,32 @@ function remux_mencoder
 	# Assemble video options
 	VC=${REMUX_PARAM_VC:-$MENCODER_VC}
 	VOPTS=${REMUX_PARAM_VOPTS}
-	WIDTH=${REMUX_PARAM_WIDTH:-$WIDTH}
+	FPS=${REMUX_PARAM_FPS:-$FPS}
+
+	# if only one of HEIGHT/WIDTH given:
+	# have mencoder calculate other value depending on actual aspect ratio
+	if [ "$HEIGHT" -a -z "$WIDTH" ]; then
+	  WIDTH=-3
+	elif [ "$WIDTH" -a -z "$HEIGHT" ]; then
+	  HEIGHT=-3
+	fi
+
 	case "$VC" in
 		lavc)
 			LAVCOPTS=(
 				${VOPTS}
-				$(hasOpt "$VOPTS" vcodec || echo "vcodec=$MENCODER_LAVC_VC")
+				$(IFS=$IFS:; addOpts "$VOPTS" $MENCODER_LAVC_VOPTS)
 				${VBR:+vbitrate=$VBR}
 			)
 			[ ${#LAVCOPTS[*]} -gt 0 ] && VOPTS=$(IFS=:; echo -lavcopts "${LAVCOPTS[*]}")
 			;; 
 		x264)
+			isNumeric "$HEIGHT" && [ $HEIGHT -lt 0 -a $HEIGHT -gt -8 ] && ((HEIGHT-=8))
+			isNumeric "$WIDTH" && [ $WIDTH -lt 0 -a $WIDTH -gt -8 ] && ((WIDTH-=8))
 			X264OPTS=(
 				${VOPTS}
-				$(hasOpt "$VOPTS" threads || echo "threads=auto")
-				${VBR:+bitrate=$ABR}
+				$(IFS=$IFS:; addOpts "$VOPTS" $MENCODER_X264_VOPTS)
+				${VBR:+bitrate=$VBR}
 			)
 			[ ${#X264OPTS[*]} -gt 0 ] && VOPTS=$(IFS=:; echo -x264encopts "${X264OPTS[*]}")
 			;;
@@ -121,7 +156,7 @@ function remux_mencoder
 			LAVCOPTS=(
 				${LAVCOPTS[*]}
 				${AOPTS}
-				$(hasOpt "$AOPTS" acodec || echo "acodec=$MENCODER_LAVC_AC")
+				$(IFS=$IFS:; addOpts "$AOPTS" $MENCODER_LAVC_AOPTS)
 				${ABR:+abitrate=$ABR}
 			)
 	
@@ -133,6 +168,7 @@ function remux_mencoder
 			LAMEOPTS=(
 				${AOPTS}
 				$(isNumeric "${ABR}" && [ "${ABR}" -lt "$ABR_MONO" ] && ! hasOpt "${AOPTS}" mode ] && echo 'mode=3')
+				$(IFS=$IFS:; addOpts "$AOPTS" $MENCODER_LAME_AOPTS)
 				${ABR:+preset=$ABR}
 			)
 			[ ${#LAMEOPTS[*]} -gt 0 ] && AOPTS=$(IFS=:; echo -lameopts "${LAMEOPTS[*]}")
@@ -140,6 +176,7 @@ function remux_mencoder
 		faac)
 			FAACOPTS=(
 				${AOPTS}
+				$(IFS=$IFS:; addOpts "$AOPTS" $MENCODER_FAAC_AOPTS)
 				${ABR:+br=$ABR}
 			)
 			[ ${#FAACOPTS[*]} -gt 0 ] && AOPTS=$(IFS=:; echo -faacopts "${FAACOPTS[*]}")
@@ -155,15 +192,17 @@ function remux_mencoder
 
 	startReply
 	exec 3<&0
-	echo "$MENCODER" \
+	echo $MENCODER \
 		-ovc $VC $VOPTS \
 		-oac $AC $AOPTS \
-		${WIDTH:+-vf scale -zoom -xy $WIDTH} \
+		${WIDTH:+-vf scale=$WIDTH:$HEIGHT -zoom} \
+		${FPS:+-ofps $FPS} \
 		-o "$FIFO" -- - >&2
-	"$MENCODER" \
+	$MENCODER \
 		-ovc $VC $VOPTS \
 		-oac $AC $AOPTS \
-		${WIDTH:+-vf scale -zoom -xy $WIDTH} \
+		${WIDTH:+-vf scale=$WIDTH:$HEIGHT -zoom} \
+		${FPS:+-ofps $FPS} \
 		-o "$FIFO" -- - 0<&3 >/dev/null &
 }
 
@@ -171,7 +210,15 @@ function remux_ogg
 {
 	VOPTS=${REMUX_PARAM_VOPTS//[:=]/ }
 	AOPTS=${REMUX_PARAM_AOPTS//[:=]/ }
-	WIDTH=${REMUX_PARAM_WIDTH:-$WIDTH}
+
+	# if only one of HEIGHT/WIDTH given:
+	# calculate other value depending on configured aspect ratio
+	# trim to multiple of 8
+	if [ "$HEIGHT" -a -z "$WIDTH" ]; then
+	  WIDTH=$((HEIGHT * $OGG_ASPECT / 8 * 8))
+	elif [ "$WIDTH" -a -z "$HEIGHT" ]; then
+	  HEIGHT=$(($WIDTH * $( echo $OGG_ASPECT | sed 's#^\([0-9]\+\) */ *\([0-9]\+\)$#\2 / \1#') / 8 * 8))
+	fi
 
 	OGGOPTS=(
 		${VOPTS}
@@ -187,14 +234,14 @@ function remux_ogg
 
 	startReply
 	exec 3<&0
-	echo "$OGG" --format ts \
+	echo $OGG --format ts \
 		${OGGOPTS[*]} \
-		${WIDTH:+--width $WIDTH --height $(($WIDTH * 3 / 4 / 8 * 8))} \
+		${WIDTH:+--width $WIDTH --height $HEIGHT} \
                 --title "VDR Streamdev: ${REMUX_CHANNEL_NAME}" \
                 --output "$FIFO" -- - 0<&3 >&2
-	"$OGG" --format ts \
+	$OGG --format ts \
 		${OGGOPTS[*]} \
-		${WIDTH:+--width $WIDTH --height $(($WIDTH * 3 / 4 / 8 * 8))} \
+		${WIDTH:+--width $WIDTH --height $HEIGHT} \
                 --title "VDR Streamdev: ${REMUX_CHANNEL_NAME}" \
                 --output "$FIFO" -- - 0<&3 >/dev/null &
 }
@@ -254,6 +301,7 @@ esac
 ABR=${REMUX_PARAM_ABR:-$ABR}
 VBR=${REMUX_PARAM_VBR:-$VBR}
 WIDTH=${REMUX_PARAM_WIDTH:-$WIDTH}
+HEIGHT=${REMUX_PARAM_HEIGHT:-$HEIGHT}
 PROG=${REMUX_PARAM_PROG:-$PROG}
 
 case "$PROG" in