mpegts: add fix_teletext_pts mpegts demuxer option

Changes since v1 of the patch:
- enable option by default
- add documentation
- move up PTS override code after PES header parsing, to ensure we use the
  last PCR before the first packet of the teletext PES packet.

The option overrides teletext packet PTS and DTS values with the timestamps
calculated from the PCR of the first program which the teletext stream is part
of and is not discarded.

Using the same teletext PID for multiple programs is possible, therefore we
need some kind of heuristics to know which program PCR we should synchronize
to. Using the first non-discarded PCR pid among the programs of the teletext
stream seemed like a good choice.

The patch does not do PCR interpolation to estimate the PCR of the teltetext
packet, it just uses the last PCR of the program, which may cause a slight
error (0.1 sec) in the teletext packet pts-es.

Based on a patch by Reimar Döffinger.
http://lists.ffmpeg.org/pipermail/ffmpeg-devel/2012-September/131610.html

Signed-off-by: Marton Balint <cus@passwd.hu>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 13 insertions, 0 deletions

diff --git a/doc/demuxers.texi b/doc/demuxers.texi
index 1a4d739268..e18448f779 100644
--- a/doc/demuxers.texi
+++ b/doc/demuxers.texi
@@ -257,6 +257,19 @@ ffmpeg -pattern_type glob -i "*.png" -r 10 out.mkv
 @end example
 @end itemize
 
+@section mpegts
+
+MPEG-2 transport stream demuxer.
+
+@table @option
+
+@item fix_teletext_pts
+Overrides teletext packet PTS and DTS values with the timestamps calculated
+from the PCR of the first program which the teletext stream is part of and is
+not discarded. Default value is 1, set this option to 0 if you want your
+teletext packet PTS and DTS values untouched.
+@end table
+
 @section rawvideo
 
 Raw video demuxer.