Out of sync playback since encoder change at KSTP Minneapolis St. Paul

[Greg Maus <g.maus@…>]

My local ABC affiliate (KSTP - Minneapolis-St. Paul, MN) recently changed out their ATSC encoder with a Harmonic 8130. Since the change, audio and video are severely out of sync in Mythtv. Playback of recorded files directly in Mplayer, xine, and VLC playback fine.

My mythtv version is 23.1-2.fc12 (r25902)

Full details are here: ​http://www.gossamer-threads.com/lists/mythtv/users/455048

Taylor Ralph has analysed a sample file, and he states that the file doesn't provide any valid video timestamps (DTS or PTS).

[mpegts @ 0x93da2c0]invalid dts/pts combination

A sample file is located at ​http://filebin.ca/mhvyt/KSTP_5.1sample.mpg

Ticket issue2286 has been opened at roundup.ffmpeg.org

[tralph]

(In [26722]) FFmpeg: workaround for invalid dts/pts combination. The orginal code sets both dts and pts to AV_NOPTS_VALUE making proper playback impossible. The better approach is just to set the pts to AV_NOPTS_VALUE and hope the dts values are correct.

Refs #9076.

[tralph]

(In [26723]) Backport [26722].

FFmpeg: workaround for invalid dts/pts combination. The orginal code sets both dts and pts to AV_NOPTS_VALUE making proper playback impossible. The better approach is just to set the pts to AV_NOPTS_VALUE and hope the dts values are correct.

Fixes #9076.