[mythtv-users] Jitters during playback

[Mark Kendall]

On 28 January 2012 04:30, Mitchell Gore <mitchell.gore at gmail.com> wrote:
> Hi,
>
> When I play back many recording I constantly get jitters/pixelations and
> sometimes a complete drop of vido playback.  In the frontend log I see:
>
> 2012-01-27 22:16:33.328 [ac3 @ 0x9d8ae0]frame CRC mismatch
> 2012-01-27 22:18:21.705 AFD Error: Unknown audio decoding error
> 2012-01-27 22:18:33.646 [ac3 @ 0x9d8ae0]incomplete frame

These errors suggest to me a signal issue.

> mitchell at mythfe:/var/log/mythtv$
> mitchell at mythfe:/var/log/mythtv$
> mitchell at mythfe:/var/log/mythtv$ tail -n 400 mythfrontend.log
> 2012-01-27 22:10:30.344 AFD Error: Unknown audio decoding error
> 2012-01-27 22:10:30.349 [ac3 @ 0x9d8ae0]frame CRC mismatch
> 2012-01-27 22:10:30.378 [ac3 @ 0x9d8ae0]frame sync error
> 2012-01-27 22:10:30.378 AFD Error: Unknown audio decoding error
> 2012-01-27 22:10:30.433 [ac3 @ 0x9d8ae0]frame CRC mismatch
> 2012-01-27 22:10:30.460 [ac3 @ 0x9d8ae0]frame sync error
> 2012-01-27 22:10:30.461 AFD Error: Unknown audio decoding error
> 2012-01-27 22:10:32.518 Player(0): Waited 100ms for video buffers
> AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
> 2012-01-27 22:10:42.148 Player(0): Waited 100ms for video buffers
> AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
> 2012-01-27 22:10:42.157 Player(0): Waited 100ms for video buffers
> AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
> 2012-01-27 22:10:54.930 [ac3 @ 0x9d8ae0]frame CRC mismatch
> 2012-01-27 22:10:54.962 [ac3 @ 0x9d8ae0]frame sync error
> 2012-01-27 22:10:54.962 AFD Error: Unknown audio decoding error
> 2012-01-27 22:10:55.180 [ac3 @ 0x9d8ae0]frame CRC mismatch
> 2012-01-27 22:10:55.210 [ac3 @ 0x9d8ae0]frame sync error
> 2012-01-27 22:10:55.211 AFD Error: Unknown audio decoding error
> 2012-01-27 22:10:56.046 [ac3 @ 0x9d8ae0]frame CRC mismatch
> 2012-01-27 22:10:56.076 [ac3 @ 0x9d8ae0]frame sync error
> 2012-01-27 22:10:56.076 AFD Error: Unknown audio decoding error
> 2012-01-27 22:10:56.254 [ac3 @ 0x9d8ae0]frame CRC mismatch
> 2012-01-27 22:10:56.267 [ac3 @ 0x9d8ae0]frame sync error
> 2012-01-27 22:10:56.268 AFD Error: Unknown audio decoding error

and perhaps an even worse signal...

> My source is a Prime Cable card.  I get nearly a 100% signal
> strength/quality acording the the HDHR meters.  Im kinda at a loss on how to
> fix this.  Is it caused by VDPAU?

Have you tried playing back with vdpau disabled? tried different
frontends/players etc.

i.e. try and confirm if the source file is in some way corrupt first,
and then look for a configuration issue or bug.

regards

Mark