[MPlayer-users] Problem with Windows Media audio

[Rich Felker]

On Thu, Jun 16, 2005 at 04:44:37AM +0400, Vladimir Mosgalin wrote:
> Hi Rich Felker!
> 
>  On 2005.06.15 at 19:51:11 -0400, Rich Felker wrote next:
> 
> > > >   Thanks a lot, I tried -afm dmo, works perfectly! I don't think I'd run
> > > >   across that one yet. :)
> > > 
> > > Well, next times you experience problems with wmv1/2 codecs, try
> > > -vfm dmo ;) It helps even more often than with wma. You'll lose nice
> > > postprocessing, though, but that's much better than watching as your
> > > video is falling apart (and what the hell are those j-frames, does
> > > anyone know?).
> > > 
> > > But afm = dmo has no drawbacks, that's why I suggested to append it to
> > > config file and forget about this problem.
> > 
> > No drawbacks?? Won't it cause windows dll crap to get loaded for many
> > formats that are playable with free decoders, resulting in worse
> > performance if nothing else..?
> 
> Worse performance for audio decoding? No, not really. Besides, (AFAIR it
> I heard it on this list), dmo codecs are heavily optimized and they
> quite fast. I checked it now, ffmpeg audio decoder uses 0.3-0.4% cpu on
> wma2 files I tested. acm decoder uses 0.4-0.5% cpu. dmo one - 0.5-0.6%.

You're right that they're optimized. In fact they depend on particular
cpu extensions (mmx2? sse?) and will crash with invalid opcode on
older cpus.

Anyway your cpu %'s already show that they're slower.

Rich