[Mplayer-users] Clicking/pausing/generally bad sound

[Felix Buenemann]

On Mittwoch, 25. April 2001 17:25 you wrote:
> > On Mittwoch, 25. April 2001 03:02 you wrote:
> > > Oh, and if I use gl, that second percentage becomes 70% or so. With x11
> > > it's about 29,30% as with fbdev... but the first percentage is immense
> > > with x11, like 100% or something... whereas it's small (30%) with gl.
> >
> > No wonder sound skips, the resolution of the DivX is immense, no proper
> > divx
>
> Yup, true; bad example. However, it happens with the vast majority of divx
> that I've ever tried, which encompasses a broad range of other
> sizes/resolutions/etc from 640x300 or so, to 320*200 or so, and whilst I
> discovered late last night that I get reasonable playback on
> TV-screen-resolution @24fps (9%, though according to top it's still using
> 50% of cpu)...
>
> Okay, so I try again with a 720 x 480 image...
>
> To clarify: mplayer renders video perfectly as far as I can see, say with
> this Divx I'm watching now, 'top' says it's on 52% of cpu usage using sdl,
> the graphics are fine, it's a 720x480 video... and the sound's going
> tick-tick-tick... and if I had the soundtrack as a separate mp3 I could be
> playing it concurrently and getting perfect performance... indeed, I am
> running 'mpg123 AlicesRestaurant.mp3' right now... Which probably proves
> nothing... I have no idea how mp3 decoding from avis works, if it's
> comparable.
>
> With any of these divx's, apart from the very largest one, which as you
> correctly mentioned uses stupid amounts of CPU, I get perfect vision,
> buggered up sound to some extent, and generally ten times enough spare cpu
> to be able to mpg123 Anything.mp3 at the same time and get flawless mp3
> playback. Granted that with mpg123, X and mplayer running together there
> isn't much spare cpu left for, say, compiling kernels... ;-)
>
> > are made at full DVD resolution cause they simply eat too much decoding
> > power, even 640x480 would be too slow, that's one reason black bars above
> > and below the movie are cutted so you get 640x272 or whatever (besides it
> > improves image quality). As you can see you system is loaded at about 95%
> > so I don't wonder sound skips. Usual divx on my PC (PIII 930) play at
> > about 10-20% load for decoding, and about 30-60% with PostProcessing
> > (-pp) set to 4. Sound needs additional 1.5-3% depending on quality and
> > format and 2% are spend for libvo driver when using yuv acceleration and
> > about 6% for rgb/bgr modes (sdl driver and xv/x11).
>
> ....so since /this/ divx is taking 50% of cpu according to top, there
> should be enough left for that additional 1.5 to 3% ;-)
>
> > Btw. I would suggest using at least 24bpp for
> > best image quality or best thing is to use a video out that handles yuv
> > format, if you don't have xv acceleration try sdl out, it displays yuv to
> > x11, xv or dga (aalib in upcoming release), you have to export
> > SDL_VIDEODRIVER=dga to use dga, if you got support for that on your
> > system. (in sdl driver yuv is about twice as fast as rgb/bgr tested with
> > unreleased sdl out with rgb support (yea, in release, too).
>
> You're right about sdl, it appears to give a good image... still *#&@%!
> sound though.
>
> export SDL_VIDEODRIVER=dga
> mplayer -vo dga  /mnt/lose/AVI/foo.avi
>
> gives me:
>
> vo_dga: Supporting mode: depth=16, bpp=16, r=00f800, g=0007e0, b=00001f
> (-bpp 16)
> Loading DLL: /usr/lib/win32/divx_c32.ax  OK
> DivX setting result = 0
> VO: [dga] 352x288 => 352x288  BGR16
> Xlib:  extension "XFree86-DGA" missing on display ":0.0".
> vo_dga: DGA 2.0 available :-) Can switch resolution AND depth!
> vo_dga: Selected video mode 100000 x 100000 @ 100000 Hz @ depth 16, bitspp
> 16, video 352 x 288.
> Segmentation fault
>
> There is a module Xfree86-dga which is usually excluded when I load X, I
> don't know what it is (but it buggers up my system if it isn't excluded).
> I tried including it and got just the same error followed by the same
> segfault, which I expect means that I've got it all wrong somewhere.
>
> > Btw. you can benchmark mplayer performance with perl -e 'system "mplayer
> > -fps 10000 -nosound some.avi" and printf "bench took %i sec\n", time -
> > $^T'
>
> umm...
> I guess with -vo something, because without any -vo option mplayer spits
> it out complaining Sorry, Xv not supported by this X11 version/driver
>
Try sdl with dga out it's much faster (at least for me) then -vo dga, you can 
use it with -vo sdl -sdl dga.
By far fastest is xv or sdl with xv acceleration (there yhould be no speed 
difference, although SDL should be faster on multiprocessor systems.).

>
> Em
>
>

-- 
Best Regards,
   Felix

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