• Marton Balint's avatar
    mpegts: add fix_teletext_pts mpegts demuxer option · a7bb12a3
    Marton Balint authored
    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.htmlSigned-off-by: 's avatarMarton Balint <cus@passwd.hu>
    Signed-off-by: 's avatarMichael Niedermayer <michaelni@gmx.at>
    a7bb12a3
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