[mythtv-users] SPDIF,
Stutter and Query for where to look for more help
daworm at comcast.net
daworm at comcast.net
Wed May 4 16:59:04 UTC 2005
> Extra audio buffering:
> Enable this setting if MythTV is playing "crackly" audio and you are
> using hardware encoding. This setting will have no effect on MPEG-4 or
> RTJPEG video. MythTV will keep extra audio data in its internal buffers
> to workaround this bug.
>
> (Has no effect unless you're using a PVR-x50 and similar, and would only
> make a difference on dark scenes.)
Ok, I don't think that is a problem. I am capturing mostly via firewire. I also have a PVR-250 for any SD programs that conflict (and HD has priority), but I haven't noticed any crackly audio.
> Aggressive Soundcard Buffering:
> If enabled, MythTV will pretend to have a smaller soundcard buffer than
> is really present. This may speed up seeking, but can also cause
> playback problems.
>
> (Is almost defintely not what you--or anyone else--want.)
Ok, so I'll leave both settings off. Easy enough!
> So, you do need to fix your .asoundrc. I recommend starting with:
> http://www.mythtv.info/moin.cgi/DigitalSoundHowTo#head-b318f22131b4a59eef5f28edf
> ac9160204e13719
> . Read the entire post and you should find the information you need to
> modify it. You'll need to verify/change the device for your digital
> output, and you might as well change the "nForce" in the comments--but I
> highly recommend you read the entire post to help you understand *why*
> you're making these changes.
Yes, I had come to the same point, and made those changes (hw:0,4 was the only needed change to point to the digital out on this Intel board). Unfortunately, it didn't help.
> > P.S. I suppose there are four other possibilities for stutter. One, I
> > used Jarod's guide suggestion to make mythfrontend run as root, but
> > for some reason mythfrontend still says I need to SUID as root for
> > smoother playback.
>
> as root:
> chmod a+s /usr/local/bin/mythfrontend
>
> (In section "Enabling real-time scheduling of the display thread." at
> http://www.mythtv.org/docs/mythtv-HOWTO-5.html#ss5.4 )
On FC3, the "local" part does not apply, correct? I think what I did didn't have the "a" (only the "+s") so I'll try that when I get home.
> > Two, my video sync is still USleep, as I can't run 7174 (see previous
> > post about "split-screen" effect) and can't get OpenGL to run on 6629
> > (crashes X when I run glxgears).
>
> Shouldn't make that big of a difference (although I recommend fixing
> your driver installation, anyway).
I wish I knew how. I've installed 6629, 7167 and 7174 and the first does not allow any OpenGL apps to run, and the latter two both have the split screen problem. I have a GF2 card I can try, but would rather use the FX5200 as I have mostly working modelines that took forever to get right. But, if I must, I must. After building this box over nearly two years, what's a few more weeks to get another video card, right?
> echo 1024 > /proc/sys/dev/rtc/max-user-freq
...
> immediately after boot. If you get 1024, you're done. If not, put the
> echo line into your startup scripts (if you're using udev or devfs, make
> sure it executes after the device has been created).
I'll look into that. I think I know where it should go, but if I'm not correct I can search the archives.
> Regardless, you'll want to fix your audio, anyway.
Yes. I don't know whether the AD1985 on this Intel board is a hardware or software card. Considering it mentions AC'97 I would think it may be software based, which would mean I'd be better off just getting a new card (I have open PCI slots, although it would mean having three cards adjacent, which isn't great for airflow. I don't really want to spend too much on a card. Is the Hercules Digifire card hardware based? Or should I bite the bullet and get an Audigy?
Thanks for the feedback. It has been most helpful!
Jeff.
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