[mythtv-users] What do I have to do to get HD working?
Michael T. Dean
mtdean at thirdcontact.com
Fri Apr 14 21:49:52 UTC 2006
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.
Mike
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