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Playing HD content with mplayer - audio out of sync
http://forum.linhes.org/viewtopic.php?f=17&t=13305		 Page 1 of 1
Author:  Type82 [ Thu Jan 04, 2007 5:56 pm ]
Post subject:  Playing HD content with mplayer - audio out of sync
I have some movies in high def that I'm trying to play in mythvideo (using mplayer with updated codecs). I have my X servers displaying at 1920x1080 (on a side note, people need to be very .. very careful when trying to do this. I now have two small pale horizontal bars on my 56" hdtv. Most people can't see them, but I can on light backgrounds. Since then, I've modified my modelines to use different refresh rates.)

I've enabled the sticky bit on the mplayer binary to help give it priority, as well as renicing the process after it's started. I don't have a super fast process, which is of course my biggest limitation here. I'm using an AMD 2200+ (1.8Ghz). I've disabled all other background processess that are not needed. A ps auwfx output shows all other processes are not using any noticable CPU or memory resources.

So I can actually play the video files without a problem. 1080i videos seem to be playing ok (although I only have one to test with), but the audio on 720p videos seems to get out of sync. The audio starts off in sync, but then slowly starts to losse it and it comes unwatchable.

Side note: the one and only 1080i movie I have to test with is encoded with HD-XViD, the others are .mkv files. The size of the mkv is less than half of the HD-XViD movie, so I'm sure they are encoded with some other codec that I'm not familar with which is probably why it requires more CPU power to decode the videos.


Here's a snippet of a vmstat. I started 'vmstat 1' before watching a movie, then started playing a 720p.

Code:
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy id wa
 0  0      0  38760   2524 247748    0    0   103    17   18   248 47  7 36 10
 0  0      0  38760   2524 247748    0    0     0    12 1081    88  0  0 100  0
 0  0      0  38760   2524 247748    0    0     0     0 1065    59  0  0 100  0
 0  0      0  38760   2532 247740    0    0     0    40 1069    59  0  0 100  0
 0  0      0  38760   2532 247740    0    0     0     0 1067    55  0  0 100  0
 0  0      0  38760   2532 247740    0    0     0     0 1066    55  0  0 100  0
 0  0      0  38760   2532 247740    0    0     0    12 1069    60  0  0 100  0
 0  0      0  38760   2532 247740    0    0     0     0 1066    55  0  0 100  0
 2  0      0  38752   2540 247732    0    0     0    28 1078    83 88  1 11  0
 2  0      0  31528   2540 247732    0    0     0     0 1070   677 95  5  0  0
 3  0      0  19628   2540 250504    0    0   164     0 1133  1580 91  9  0  0
 3  0      0  18084   2540 250636    0    0   204    52 1125   675 99  1  0  0
 1  0      0  17664   2540 251032    0    0   384     0 1155   154 97  1  2  0
 1  0      0  17184   2548 251552    0    0   512   268 1189   244 95  1  4  0
 1  0      0  16644   2556 252072    0    0   512    16 1191   262 93  2  5  0
 0  0      0  16332   2556 252468    0    0   384     0 1168   225 93  1  6  0
 0  0      0  15792   2556 252996    0    0   512     0 1174   246 95  0  5  0



So as you an see, I'm heavily CPU taxed. I'm not swapping yet, but nearly out of available RAM.

Is there a way in mplayer to enable hardware acceleration? I'm using an FX5200 for output. Does anyone have any other suggestions how to squeeze out just a tad bit more performance so I can play these files?
Author:  Type82 [ Thu Jan 04, 2007 6:18 pm ]
Post subject: 
For those interested:

http://www.mythtv.org/wiki/index.php/XvMC#MPlayer

Apparently my customer compiled version pf mplayer has XvMC disabled (which I believe is the default behavior). I'm recompiling now and will try this out.
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