[mythtv-users] 720p HD content from WPVI in Philly periodic a/v sync issues

[Taylor Ralph]

On Wed, Feb 3, 2010 at 5:06 PM, Bob Sully <rcs at malibyte.net> wrote:
> I know this is resurrecting an old thread (December).
>
> However, I ran a search on the archives because I am having a similar
> problem with ONE QAM HD channel (KTTV, channel 11 (FOX) out of Los
> Angeles) when recording via my HDHR (from Time-Warner Cable). The same
> tuner with other QAM HD channels (CBS, ABC, NBC, etc.) makes perfect
> recordings with no sync issues.
>
> With the Fox channel (past two or three recordings of "24") the video and
> audio are out of sync, with choppy speed changes at the beginning of the
> recording.  The latter goes away after a few minutes but the audio and
> video remain out of sync for the whole hour.
>
> Interestingly, in two cases, running the recording through ffmpeg (two
> passes; changed the frame rate to 29.97 from 59.94 (60?) and the format to
> .avi) and then editing out the commercials with avidemux FIXED the
> problem.  However, with this past Monday's episode, it only fixed it for
> the first half of the file.
>
> I'm running Jean-Yves Avenard's latest (testing) versions of 0.22-fixes
> with VDPAU nVidia drivers on Ubuntu 9.10, and have had no other problems.
> CPU is a 2.4GHZ Q6600; average CPU hit while playing a recording is
> between 1 and 4%.
>
> The previous thread mentioned a patch (which apparently solves this
> problem) that is slated for inclusion in an upcoming version of -fixes.
> Anyone know if/when that will be happening?
>
> Thanks!  Otherwise, I'm very happy with my setup (outside of occasionally
> having to reset the sound driver with alsamixer....but that's a
> pulseaudio/ALSA issue, nothing to do with Myth).
>
> Bob
>

The patch is now applied to trunk so it will be in the upcoming 0.23
release. If you like to live on the edge you can run the trunk
packages but be aware that you will have to restore your database if
you choose to return to 0.22-fixes.

Regards.

--
Taylor