No matter what buffering I use (I've tried all four combinations of the two different audio buffering settings - why there are two and what the difference is I don't know, but one is in General and the other in Playback) I am getting audio buffering issues, which is causing the video output to stutter. At least I am fairly certain that is the problem, as xine does the same thing, and with --verbose=99 on the command line, it has a very similar "extending video to stay in sync with audio (paraphrase)" that myth puts out when using -v playback. I am thinking that the root problem may be in the sample rate. When I got the SPDIF working and send sound to it, my Sony receiver always says it is in PCM 48K mode. I don't believe my recordings are in that bitrate (I know what I feed xine from mythvideo isn't, but I am not sure about the 6200 firewire capture), and this may be what is causing the pauses. At least, it would seem to make logical sense if I fed in data at a rate that matched 44.1K, and the sound card shoved it out at 48K, the card would then be starved for data. (Or perhaps it is the other way around???) I think the solution is somewhere in the .asoundrc as I have found examples of bitrate conversion, but I can't find any examples of one for my Intel board (all the ones I have seen have had specific tweaks for boards with nforce or SiS chipsets, which makes me think they would not be appropriate for my Intel board). So, here are my questions:
1. Does the above make any sense, or am I completely off base?
2. If this could explain my stutters, and the .asoundrc file is the place to fix it, where should I turn for help?
3. (Mostly OT, but I'm sure others uses xine in mythvideo) In xine, I had to go to Expert mode and change the the mono and stereo audio settings from default to spdif to get playback when called from mythvideo, but there were several other settings for various multichannel modes. Where does one find info on that? Are they alsa things, or xine things? I tried to use xine's help, but apparently that isn't installed by the RPM, as it told me it couldn't find the help files (installed from Axel's RPMs stable branch). I ask, because I plan to rip my DVD's, and would like to keep the multichannel audio.
Thanks in advance, Jeff.
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. 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). Three, related to two, I also tried setting the permissions on /dev/rtc but mythfrontend still says I don't have permission. Four, I am running a 3.0 P4 with 1G 800Mhz dual channel ram, which I am led to believe is fast enough for 1920x1080i decoding, but perhaps it really isn't. Still, xine behaving just like myth makes me think that it is the audio that is the root cause, based on the verbose output of both.
_______________________________________________ mythtv-users mailing list [email protected] http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
