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#13334 (Improved Video timing and Synchronization) – MythTV
https://code.mythtv.org/trac/ticket/13334#:~:text=The%20MythTV%20frontend%20AVSync%20process%20assumes%20that%20video,is%20more%20than%20three%20frames%20out%20of%20sync.
Audio/Video sync problems especially ... - code.mythtv.org
https://code.mythtv.org/trac/ticket/10797
Audio/Video sync problems especially after seeking to start of recording. ... I've upgraded from MythTV 0.23 to 0.25 and I'm seeing the issue on existing as well as new DVB-S MPEG-2 recordings with MP2 audio. I'm running a GT220 card with an …
#13334 (Improved Video timing and Synchronization) – MythTV
https://code.mythtv.org/trac/ticket/13334
Enable the new sync method as follows. frontend -> Setup -> Video -> Playback -> Advanced Playback Settings -> Enable new timestamp based playback speed (AVSync2) . Zoom into that setting to get to AVSync2 audio correction (ms) . The audio correction should be set smaller for smoother audio correction or bigger for faster audio correction.
Configuring Digital Sound - MythTV Official Wiki
https://www.mythtv.org/wiki/Configuring_Digital_Sound
Digital sound is the preferred method to get audio from a MythTV installation for two reasons 1. We want to have the audio decoding done outside of the computer for greater sound quality. 2. We want to play DVD with full surround sound using DTS or Dolby Digital. You need to be aware that ALSA by default will upsample all of your audio to 48 kHz.
Video pipeline - MythTV Official Wiki
https://www.mythtv.org/wiki/Video_pipeline
MythPlayer::AvSync has logic to ensure the frame is played at the right time and in sync with the audio. MythPlayer::AVSync then calls videoOutput->ProcessFrame to draw the OSD and apply filters. It then calls videoOutput->PrepareFrame and videoOutput->Show. The details of these methods are dependent on the video output type.
Mailing List Archive: Audio Video Sync on v31 and Alsa ...
https://lists.archive.carbon60.com/mythtv/users/632294
mythtv now uses the presentation timestamp information (which nearly all modern video transports include) to keep these two streams synchronized. In the synchronization approach in v31, the audio timestamp information serves as the baseline and the exact moment of presentation of the
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