diff --git a/HISTORY b/HISTORY
index 93451753..0f97ae08 100644
--- a/HISTORY
+++ b/HISTORY
@@ -6699,7 +6699,7 @@ Video Disk Recorder Revision History
   constructor is negative (avoids the "cTimeMs: using monotonic clock..." log message
   before VDR's starting log message).
 
-2011-08-27: Version 1.7.21
+2011-09-04: Version 1.7.21
 
 - Fixed detecting frames for channels that split frames into several payloads
   (reported by Derek Kelly).
@@ -6738,3 +6738,4 @@ Video Disk Recorder Revision History
   receiving on SD FF devices and uses the device only for output (thanks to Udo
   Richter).
 - Fixed detecting frames on radio channels (reported by Chris Mayo).
+- Revoked the changes to cFrameDetector that have been introduced in version 1.7.19.
diff --git a/recorder.c b/recorder.c
index 6080deb0..a6cab473 100644
--- a/recorder.c
+++ b/recorder.c
@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: recorder.c 2.14 2011/08/13 14:56:36 kls Exp $
+ * $Id: recorder.c 2.15 2011/09/04 09:26:44 kls Exp $
  */
 
 #include "recorder.h"
@@ -31,7 +31,7 @@ cRecorder::cRecorder(const char *FileName, const cChannel *Channel, int Priority
 
   SpinUpDisk(FileName);
 
-  ringBuffer = new cRingBufferLinear(RECORDERBUFSIZE, TS_SIZE, true, "Recorder");
+  ringBuffer = new cRingBufferLinear(RECORDERBUFSIZE, MIN_TS_PACKETS_FOR_FRAME_DETECTOR * TS_SIZE, true, "Recorder");
   ringBuffer->SetTimeouts(0, 100);
 
   int Pid = Channel->Vpid();
@@ -88,7 +88,7 @@ bool cRecorder::RunningLowOnDiskSpace(void)
 
 bool cRecorder::NextFile(void)
 {
-  if (recordFile) {
+  if (recordFile && frameDetector->IndependentFrame()) { // every file shall start with an independent frame
      if (fileSize > MEGABYTE(off_t(Setup.MaxVideoFileSize)) || RunningLowOnDiskSpace()) {
         recordFile = fileName->NextFile();
         fileSize = 0;
@@ -119,11 +119,6 @@ void cRecorder::Action(void)
   time_t t = time(NULL);
   bool InfoWritten = false;
   bool FirstIframeSeen = false;
-#define BUFFERSIZE (5 * TS_SIZE)
-  bool Buffering = false;
-  int BufferIndex = 0;
-  int MaxBufferIndex = 0;
-  uchar *Buffer = NULL;
   while (Running()) {
         int r;
         uchar *b = ringBuffer->Get(r);
@@ -144,34 +139,9 @@ void cRecorder::Action(void)
                        }
                     InfoWritten = true;
                     }
-                 if (frameDetector->NewPayload()) { // We're at the first TS packet of a new payload...
-                    if (Buffering)
-                       esyslog("ERROR: encountered new payload while buffering - dropping some data!");
-                    if (!frameDetector->NewFrame()) { // ...but the frame type is yet unknown, so we need to buffer packets until we see the frame type
-                       if (!Buffer) {
-                          dsyslog("frame type not in first packet of payload - buffering");
-                          if (!(Buffer = MALLOC(uchar, BUFFERSIZE))) {
-                             esyslog("ERROR: can't allocate frame type buffer");
-                             break;
-                             }
-                          }
-                       BufferIndex = 0;
-                       Buffering = true;
-                       }
-                    }
-                 else if (frameDetector->NewFrame()) // now we know the frame type, so stop buffering
-                    Buffering = false;
-                 if (Buffering) {
-                    if (BufferIndex + Count <= BUFFERSIZE) {
-                       memcpy(Buffer + BufferIndex, b, Count);
-                       BufferIndex += Count;
-                       }
-                    else
-                       esyslog("ERROR: too many bytes for frame type buffer (%d > %d) - dropped %d bytes", BufferIndex + Count, int(BUFFERSIZE), Count);
-                    }
-                 else if (FirstIframeSeen || frameDetector->IndependentFrame()) {
+                 if (FirstIframeSeen || frameDetector->IndependentFrame()) {
                     FirstIframeSeen = true; // start recording with the first I-frame
-                    if (frameDetector->IndependentFrame() && !NextFile()) // every file shall start with an independent frame
+                    if (!NextFile())
                        break;
                     if (index && frameDetector->NewFrame())
                        index->Write(frameDetector->IndependentFrame(), fileName->Number(), fileSize);
@@ -184,12 +154,6 @@ void cRecorder::Action(void)
                              fileSize += TS_SIZE;
                              }
                        }
-                    if (BufferIndex) {
-                       recordFile->Write(Buffer, BufferIndex); // if an error occurs here, the next write below will catch and report it
-                       if (BufferIndex > MaxBufferIndex)
-                          MaxBufferIndex = BufferIndex;
-                       BufferIndex = 0;
-                       }
                     if (recordFile->Write(b, Count) < 0) {
                        LOG_ERROR_STR(fileName->Name());
                        break;
@@ -207,8 +171,4 @@ void cRecorder::Action(void)
            t = time(NULL);
            }
         }
-  if (Buffer) {
-     free(Buffer);
-     dsyslog("frame type buffer used %d bytes", MaxBufferIndex);
-     }
 }
diff --git a/recording.c b/recording.c
index 93433cc7..bea7eb6b 100644
--- a/recording.c
+++ b/recording.c
@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: recording.c 2.37 2011/08/27 10:55:53 kls Exp $
+ * $Id: recording.c 2.38 2011/09/04 09:32:25 kls Exp $
  */
 
 #include "recording.h"
@@ -1434,12 +1434,11 @@ void cIndexFileGenerator::Action(void)
   bool Rewind = false;
   cFileName FileName(recordingName, false);
   cUnbufferedFile *ReplayFile = FileName.Open();
-  cRingBufferLinear Buffer(IFG_BUFFER_SIZE, TS_SIZE);
+  cRingBufferLinear Buffer(IFG_BUFFER_SIZE, MIN_TS_PACKETS_FOR_FRAME_DETECTOR * TS_SIZE);
   cPatPmtParser PatPmtParser;
   cFrameDetector FrameDetector;
   cIndexFile IndexFile(recordingName, true);
   int BufferChunks = KILOBYTE(1); // no need to read a lot at the beginning when parsing PAT/PMT
-  int FileNumber = 0;
   off_t FileSize = 0;
   off_t FrameOffset = -1;
   Skins.QueueMessage(mtInfo, tr("Regenerating index file"));
@@ -1456,18 +1455,12 @@ void cIndexFileGenerator::Action(void)
         if (Data) {
            if (FrameDetector.Synced()) {
               // Step 3 - generate the index:
-              if (FrameOffset < 0 && TsPid(Data) == PATPID) {
-                 FileNumber = FileName.Number();
+              if (TsPid(Data) == PATPID)
                  FrameOffset = FileSize; // the PAT/PMT is at the beginning of an I-frame
-                 }
               int Processed = FrameDetector.Analyze(Data, Length);
               if (Processed > 0) {
-                 if (FrameDetector.NewPayload() && FrameOffset < 0) {
-                    FileNumber = FileName.Number();
-                    FrameOffset = FileSize;
-                    }
                  if (FrameDetector.NewFrame()) {
-                    IndexFile.Write(FrameDetector.IndependentFrame(), FileNumber, FrameOffset);
+                    IndexFile.Write(FrameDetector.IndependentFrame(), FileName.Number(), FrameOffset >= 0 ? FrameOffset : FileSize);
                     FrameOffset = -1;
                     }
                  FileSize += Processed;
diff --git a/remux.c b/remux.c
index e6068439..293a202f 100644
--- a/remux.c
+++ b/remux.c
@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: remux.c 2.60 2011/08/27 14:20:18 kls Exp $
+ * $Id: remux.c 2.61 2011/09/04 10:13:14 kls Exp $
  */
 
 #include "remux.h"
@@ -785,8 +785,7 @@ cFrameDetector::cFrameDetector(int Pid, int Type)
 {
   SetPid(Pid, Type);
   synced = false;
-  newPayload = newFrame = independentFrame = false;
-  frameTypeOffset = -1;
+  newFrame = independentFrame = false;
   numPtsValues = 0;
   numFrames = 0;
   numIFrames = 0;
@@ -813,8 +812,7 @@ void cFrameDetector::SetPid(int Pid, int Type)
 
 void cFrameDetector::Reset(void)
 {
-  newPayload = newFrame = independentFrame = false;
-  frameTypeOffset = -1;
+  newFrame = independentFrame = false;
   payloadUnitOfFrame = 0;
   scanning = false;
   scanner = EMPTY_SCANNER;
@@ -822,8 +820,9 @@ void cFrameDetector::Reset(void)
 
 int cFrameDetector::Analyze(const uchar *Data, int Length)
 {
+  int SeenPayloadStart = false;
   int Processed = 0;
-  newPayload = newFrame = independentFrame = false;
+  newFrame = independentFrame = false;
   while (Length >= TS_SIZE) {
         if (Data[0] != TS_SYNC_BYTE) {
            int Skipped = 1;
@@ -836,8 +835,11 @@ int cFrameDetector::Analyze(const uchar *Data, int Length)
            int Pid = TsPid(Data);
            if (Pid == pid) {
               if (TsPayloadStart(Data)) {
+                 SeenPayloadStart = true;
                  if (synced && Processed)
-                    return Processed; // flush everything before this new payload
+                    return Processed;
+                 if (Length < MIN_TS_PACKETS_FOR_FRAME_DETECTOR * TS_SIZE)
+                    return Processed; // need more data, in case the frame type is not stored in the first TS packet
                  if (framesPerSecond <= 0.0) {
                     // frame rate unknown, so collect a sequence of PTS values:
                     if (numPtsValues < 2 || numPtsValues < MaxPtsValues && numIFrames < 2) { // collect a sequence containing at least two I-frames
@@ -902,10 +904,6 @@ int cFrameDetector::Analyze(const uchar *Data, int Length)
               if (scanning) {
                  int PayloadOffset = TsPayloadOffset(Data);
                  if (TsPayloadStart(Data)) {
-                    if (synced && Processed)
-                       return Processed; // flush everything before this new payload
-                    newPayload = true;
-                    scanner = EMPTY_SCANNER;
                     PayloadOffset += PesPayloadOffset(Data + PayloadOffset);
                     if (!framesPerPayloadUnit)
                        framesPerPayloadUnit = framesInPayloadUnit;
@@ -913,29 +911,17 @@ int cFrameDetector::Analyze(const uchar *Data, int Length)
                        dbgframes("/");
                     }
                  for (int i = PayloadOffset; scanning && i < TS_SIZE; i++) {
-                     if (frameTypeOffset < 0) {
-                        scanner <<= 8;
-                        scanner |= Data[i];
-                        }
-                     else
-                        frameTypeOffset += PayloadOffset;
+                     scanner <<= 8;
+                     scanner |= Data[i];
                      switch (type) {
                        case 0x01: // MPEG 1 video
                        case 0x02: // MPEG 2 video
                             if (scanner == 0x00000100) { // Picture Start Code
-                               if (frameTypeOffset < 0) {
-                                  frameTypeOffset = i + 2;
-                                  if (frameTypeOffset >= TS_SIZE) { // the byte to check is in the next TS packet
-                                     frameTypeOffset -= TS_SIZE;
-                                     if (!synced)
-                                        dbgframes("%d>", frameTypeOffset);
-                                     break;
-                                     }
-                                  }
                                scanner = EMPTY_SCANNER;
+                               if (synced && !SeenPayloadStart && Processed)
+                                  return Processed; // flush everything before this new frame
                                newFrame = true;
-                               uchar FrameType = (Data[frameTypeOffset] >> 3) & 0x07;
-                               frameTypeOffset = -1;
+                               uchar FrameType = (Data[i + 2] >> 3) & 0x07;
                                independentFrame = FrameType == 1; // I-Frame
                                if (synced) {
                                   if (framesPerPayloadUnit <= 1)
@@ -955,29 +941,19 @@ int cFrameDetector::Analyze(const uchar *Data, int Length)
                             break;
                        case 0x1B: // MPEG 4 video
                             if (scanner == 0x00000109) { // Access Unit Delimiter
-                               if (frameTypeOffset < 0) {
-                                  frameTypeOffset = i + 1;
-                                  if (frameTypeOffset >= TS_SIZE) { // the byte to check is in the next TS packet
-                                     frameTypeOffset -= TS_SIZE;
-                                     if (!synced)
-                                        dbgframes("%d>", frameTypeOffset);
-                                     break;
-                                     }
-                                  }
                                scanner = EMPTY_SCANNER;
+                               if (synced && !SeenPayloadStart && Processed)
+                                  return Processed; // flush everything before this new frame
                                newFrame = true;
-                               uchar FrameType = Data[frameTypeOffset];
-                               frameTypeOffset = -1;
+                               uchar FrameType = Data[i + 1];
                                independentFrame = FrameType == 0x10;
                                if (synced) {
                                   if (framesPerPayloadUnit < 0) {
                                      payloadUnitOfFrame = (payloadUnitOfFrame + 1) % -framesPerPayloadUnit;
                                      if (payloadUnitOfFrame != 0 && independentFrame)
                                         payloadUnitOfFrame = 0;
-                                     if (payloadUnitOfFrame) {
-                                        newPayload = false;
+                                     if (payloadUnitOfFrame)
                                         newFrame = false;
-                                        }
                                      }
                                   if (framesPerPayloadUnit <= 1)
                                      scanning = false;
diff --git a/remux.h b/remux.h
index 3204bb41..db0f6909 100644
--- a/remux.h
+++ b/remux.h
@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: remux.h 2.30 2011/06/12 12:49:17 kls Exp $
+ * $Id: remux.h 2.31 2011/09/04 09:09:33 kls Exp $
  */
 
 #ifndef __REMUX_H
@@ -336,16 +336,16 @@ void PesDump(const char *Name, const u_char *Data, int Length);
 
 // Frame detector:
 
+#define MIN_TS_PACKETS_FOR_FRAME_DETECTOR 2
+
 class cFrameDetector {
 private:
   enum { MaxPtsValues = 150 };
   int pid;
   int type;
   bool synced;
-  bool newPayload;
   bool newFrame;
   bool independentFrame;
-  int frameTypeOffset;
   uint32_t ptsValues[MaxPtsValues]; // 32 bit is enough - we only need the delta
   int numPtsValues;
   int numFrames;
@@ -377,11 +377,6 @@ public:
       ///< Analyze() needs to be called again with more actual data.
   bool Synced(void) { return synced; }
       ///< Returns true if the frame detector has synced on the data stream.
-  bool NewPayload(void) { return newPayload; }
-      ///< Returns true if the data given to the last call to Analyze() started a
-      ///< new payload. The caller should remember the current file offset in
-      ///< order to be able to generate an index entry later, when NewFrame()
-      ///< returns true.
   bool NewFrame(void) { return newFrame; }
       ///< Returns true if the data given to the last call to Analyze() started a
       ///< new frame.