[mythtv-users] XvMC Angst with 0.20 on Ubuntu with GeForce FX5200

[Norm Dugas]

Sam Hathaway wrote:
> On Oct 7, 2006, at 4:47 PM, Sam Hathaway wrote:
>
>
>   
>> The problem is, playback is slow and choppy, sound cuts in and out,
>> and I get these messages (with --verbose playback on):
>>
>> 2006-10-07 12:02:46.352 WriteAudio: buffer underrun
>> 2006-10-07 12:02:46.588 NVP: Video is 3.51891 frames behind audio
>> (too slow), skipping A/V wait.
>> 2006-10-07 12:02:46.696 NVP: Video is 4.02533 frames behind audio
>> (too slow), skipping A/V wait.
>> 2006-10-07 12:02:46.804 NVP: Video is 4.39013 frames behind audio
>> (too slow), skipping A/V wait.
>> 2006-10-07 12:02:46.912 NVP: Video is 4.64874 frames behind audio
>> (too slow), skipping A/V wait.
>> 2006-10-07 12:02:47.004 NVP: Video is 3.62141 frames behind audio
>> (too slow), skipping A/V wait.
>> 2006-10-07 12:02:47.104 NVP: Video is 3.2855 frames behind audio (too
>> slow), skipping A/V wait.
>>
>> These repeat continuously for the duration of playback. This is with
>> 1080i ATSC source material. I'm pretty sure it's not the CPU -- CPU
>> usage is under 50%.
>>
>>     
>
> More information: I've since tried playing back SD programs (480i I  
> think) with XvMC enabled, and it looks fine, with no errors in the  
> log. I haven't been able to find any 780p content to test, but I have  
> tried playing back DVDs with the Internal player, and I get the same  
> problems as with 1080i.
>
> After playing with it some more, I've noticed that the video is not  
> only choppy, but is playing back much slower than it should be.
>
> I remember seeing something a while ago maybe about the bandwidth  
> required by 1080i XvMC being too much for the AGP bus or something,  
> but I can't find it now. Does that sound familiar? Are there any BIOS  
> setting that could make a difference?
>
> Thanks.
> -sam
>
>   
Check out this thread.  It should give you some pointers on what to
looks for/at.  Your setup almost sounds like mine:  Asus A7N8X-E
Deluxe,  Athlon XP 2500, 1G ram, and a FX5500 AGP video card and I can
display 1080i without any hiccups at all.

http://www.gossamer-threads.com/lists/mythtv/users/224112?search_string=My%20Perennial%20Problems%20with%20XvMC;#224112
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