[mythtvnz] VDPAU AV-Sync Errors

[Steven Ellis]

On 26/04/2009, at 5:52 PM, Jean-Yves Avenard wrote:

> Ok
>
> I have your two videos playing properly now ...
>
> It was just a matter of increasing the video buffer again.
>
> the downside in doing so is that videos playback takes slightly  
> longer to start.
>
> In those two streams you've sent, there's up to 850ms delay between
> audio and video ! that's huge

Wow...

Might have a word with the guys at freeview about this. Their spec  
does require quite a bit of buffer on the STBs to handle this sort of  
thing, but I wasn't expecting this sort of delay.

Thanks for tracking down the problem.

Steve

>
>
> Jean-Yves
>
> 2009/4/26 Steven Ellis <steven at openmedia.co.nz>:
>>
>>
>> Well I've been testing the latest builds and for the most part  
>> stability
>> is greatly improved on the VDPAU support for freeview|HD.
>>
>> I did have a reproducible issue with Maori TV and Parliament this  
>> morning
>> when they are displaying their testcard with an audio stream.  
>> Samples are
>> available at
>>
>> http://www.mythtv.co.nz/mythtv/dtt/video/12005_20090426120148.mpg
>> http://www.mythtv.co.nz/mythtv/dtt/video/12022_20090426120606.mpg
>>
>> These play without issue in a recent build of mplayer but if I use  
>> MythTV
>> I get the following output and start to get jumpy playback
>>
>> 2009-04-26 11:37:00.408 Audio 29 ms behind video but already 100  
>> video
>> frames queued. AV-Sync might be broken.
>> 2009-04-26 11:37:00.449 Audio 62 ms behind video but already 100  
>> video
>> frames queued. AV-Sync might be broken.
>> 2009-04-26 11:37:00.487 Audio 102 ms behind video but already 100  
>> video
>> frames queued. AV-Sync might be broken.
>> 2009-04-26 11:37:00.527 Audio 142 ms behind video but already 100  
>> video
>> frames queued. AV-Sync might be broken.
>> 2009-04-26 11:37:00.586 Audio 33 ms behind video but already 100  
>> video
>> frames queued. AV-Sync might be broken.
>> 2009-04-26 11:37:00.626 Audio 66 ms behind video but already 100  
>> video
>> frames queued. AV-Sync might be broken.
>> 2009-04-26 11:37:00.665 Audio 98 ms behind video but already 100  
>> video
>> frames queued. AV-Sync might be broken.
>> 2009-04-26 11:37:00.705 Audio 131 ms behind video but already 100  
>> video
>> frames queued. AV-Sync might be broken.
>> 2009-04-26 11:37:00.745 Audio 23 ms behind video but already 100  
>> video
>> frames queued. AV-Sync might be broken.
>> 2009-04-26 11:37:00.786 Audio 55 ms behind video but already 100  
>> video
>> frames queued. AV-Sync might be broken.
>> 2009-04-26 11:37:00.826 Audio 88 ms behind video but already 100  
>> video
>> frames queued. AV-Sync might be broken.
>> 2009-04-26 11:37:00.866 Audio 120 ms behind video but already 100  
>> video
>> frames queued. AV-Sync might be broken.
>> 2009-04-26 11:37:00.906 Audio 12 ms behind video but already 100  
>> video
>> frames queued. AV-Sync might be broken.
>>
>> I'd appreciate it if anyone could grab these samples and try them  
>> on their
>> Myth environment to make sure it isn't a configuration issue. The  
>> sample
>> files are around 3.5 MB each.
>>
>> Steve
>>
>> --------------------------------------------
>> Steven Ellis - Technical Director
>> OpenMedia Limited - The Home of myPVR
>> email   - steven at openmedia.co.nz
>> website - http://www.openmedia.co.nz
>>
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>
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Steven Ellis - Technical Director
OpenMedia Limited
email   - steven at openmedia.co.nz
website - http://www.openmedia.co.nz

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