Implemented 'on disk editing'

FORMATS

@@ -90,3 +90,26 @@ Video Disk Recorder File Formats
     CPU status        : /usr/loval/bin/cpustatus 2>&1
     Disk space        : df -h | grep '/video' | awk '{ print 100 - $5 "% free"; }'
 
+* marks.vdr
+
+  This file (if present in a recording directory) contains the editing marks
+  defined for this recording.
+
+  Each line contains the definition of one mark in the following format:
+
+    hh:mm:ss.ff comment
+
+  where 'hh:mm:ss.ff' is a frame position within the recording, given as "hours,
+  minutes, seconds and (optional) frame number". 'comment' can be any string
+  and may be used to describe this mark. If present, 'comment' must be separated
+  from the frame position by at least one blank.
+
+  The lines in this file need not necessarily appear in the correct temporal
+  sequence, they will be automatically sorted by time index.
+
+  CURRENT RESTRICTIONS:
+
+  - the 'comment' is currently not used by VDR
+  - marks must have a frame number, and that frame MUST be an I-frame (this
+    means that only marks generated by VDR itself can be used, since they
+    will always be guaranteed to mark I-frames).