[mythtv-users] HD Playback - vide/audio out of sync, dropping frames to catch up or doubling frame rate

[Patrick Wagstrom]

Brian L. Walter wrote:
> Greetings,
> 
> When playing back HD content, the fonrtend says the video and audio are 
> out of sync, and it's either dropping frames or doubling rate (depending 
> on whether ahead or behind) to even it out.
> 
> This seems to be happening pretty consistently, and I'm wondering - is 
> this a *recording* issue, or a playback issue?  I.E., where should I 
> focus my debugging efforts?

It's most likely NOT a recording issue.  When recording HDTV in most 
cases you're just getting a bitstream of data.  Corruption in the 
bitstream from being too slow to record is shown by noisy blocks in the 
picture and skips in the video.  The audio and video are not captured 
separately and then remuxed, which is what your problem sounds like it 
is predicated on.

I'd look at the frontend related issues.

--Patrick