Andy O'Brien wrote:
Following Jarod's guide, I got a box with firewire capture working.
(SDTV output through an nvidia geforce 4 card).
ALSA appeared to be working though I wanted to get SP/DIF working so
my reciever could get the 5.1 output from HBO, or whatever. Folllowed
the guide a little closer, and using the .asoundrc and a little
plugNplay I was able to get digital audio for a moment (reciever is
plugged into optical output on the Live! Drive IR), but on some
channels the playback appears too fast (chipmunk syndrome) and it
stutters each second).
Sounds like you're sending a 44.1kHz signal to an S/PDIF input that's
expecting 48kHz (which pretty much all of them do). Therefore, you just
need to fix your .asoundrc to resample the 44.1kHz signal into a 48kHz.
If you're using an .asoundrc like Jarod is (
http://www.wilsonet.com/mythtv/asoundrc.txt ), then you're probably
specifying the wrong output. I.e. using ALSA:spdif will not convert.
Using ALSA:default (when uncommenting the appropriate lines at the top)
or ALSA:digital or ALSA:mixed-digital will convert.
...
I tried logging in as root and running with the realtime option turned
on, no change. Now this is on a channel like cartoon network, and if I
switch to a program on HBO, 5.1 audio kicks in on my reciever and it
play normally. (haven't tried seeking too much yet))
More support for the theory of PCM with the wrong frequency, channels,
or period_time being sent to the digital output... Since you're
received an MPEG with AC3 on HBO and swtiching to an MPEG with PCM (at
what sounds like 44.1kHz) on Cartoon Network, the sound card is fighting
with Myth to try to get more sound even before Myth thinks it should
need it, so...
So any suggestions? system is an AMD XP 2400/1gig ram a 40gig main
drive and a old 6gig LVMed for future expansion. Could having the
slower drive in there be a problem? I don't think so because I can get
an HBO program to play back with no apparent playback problems.
Shouldn't be a problem.
I had an issue where If I switch channels from HBO to something like
Cartoon Network, Myth crashes, but I think it was because I had XvMC
enabled or something, seems to be better now, here's the output
anyway, maybe someone can confirm?
Can't confirm, but the audio may actually have something to do with it.
If you want XvMC, I recommend testing it again once you fix the sound
issues.
Mike
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