[mythtv-users] What do I have to do to get HD working?

[Kevin Kuphal]

Michael T. Dean wrote:
> On 04/14/2006 05:36 PM, Kevin Kuphal wrote:
>   
>> Kevin Kuphal wrote:
>>   
>>     
>>> I'm about at my wits end.  I just purchased a P4 3.2ghz HT to do HDTV 
>>> playback in software but no matter what I do, I get continual studdering 
>>> and "Video X frames ahead of audio" on my HD playback material.  This 
>>> happens on my MX4000 PCI video card system, my ATI 9100 IGP video card 
>>> system, and my Unichrome Pro video card system. 
>>>
>>> Everything I read said that a P4 3.2 is enough to do HD but nothing I do 
>>> can get it to work.  I'm running the 2.6.15 smp kernel but that almost 
>>> seems to make it worse.  With the non-smp on my Unichrome system it 
>>> plays back but only at about 17-20 fps.  With the smp kernel, it does 
>>> the 29-30 but jumps and skips complaining about the video ahead of audio.
>>>
>>> Please, anyone have any help?
>>>       
>> And a little more, I can duplicate the 17-20fps setting when I set my 
>> audio device to something wrong or if I disable audio in the BIOS.  Is 
>> this possible some kind of ALSA problem maybe?
>>   
>>     
>
> Hmmm.  20fps is 2/3 of 30fps and 32kHz is 2/3 of 48kHz....  Perhaps your 
> ALSA device is playing a 48kHz stream (which you're likely to see in 
> HDTV) at 32kHz?
>
> What audio device are you using for playback?  Assuming you have ALSA 
> 1.0.9 or above, try "ALSA:default", which will use the "plug" conversion 
> plugin to automatically convert sample, rate, and format as required for 
> your sound card.
>   
Normally I use ALSA:spdif but I tried ALSA:default with the same 
results.  If I play it with mplayer it reports that the audio is

Opening audio decoder: [liba52] AC3 decoding with liba52
Using SSE optimized IMDCT transform
AC3: 2.0 (stereo)  48000 Hz  384.0 kbit/s
Using MMX optimized resampler
AUDIO: 48000 Hz, 2 ch, s16le, 384.0 kbit/25.00% (ratio: 48000->192000)
Selected audio codec: [a52] afm:liba52 (AC3-liba52)

I don't have any .asoundrc (never needed it).  The system I'm working on 
now is the Unichrome Pro system using the internal snd_via82xx driver.  
I have a Turtle Beach riviera I could throw in there if I need to but 
the results have been the same no matter what I've tried

Kevin