[MPlayer-users] Still no vorbis audio

[Nicolas George]

Le duodi 22 messidor, an CCXVIII, Carl Eugen Hoyos a écrit :
> When I asked for samples, I meant samples to proof that libavcodec's vorbis
> encoder is actually "bad",

I just tried with the following sample:
http://upload.wikimedia.org/wikipedia/commons/3/30/Ludwig_van_Beethoven_-_Symphonie_5_c-moll_-_3._Allegro.ogg
(This is already Vorbis, but at high bitrate. I could not find quickly free
downloads of orchestral music in lossless format on the web; in my
experience, orchestral music is one of the most difficult part for audio
codecs.)

I extracted a few seconds with:

ffmpeg -ss 32 -t 20 -i sample.ogg sample.wav

And I encoded:

ffmpeg -i sample.wav -acodec vorbis -aq 30 -strict experimental -y vorbis.ogg
ffmpeg -i sample.wav -acodec libvorbis -aq 2 -y libvorbis.ogg

This yields the following results:

libvorbis.ogg  size: 198652 o  bitrate: 77.00 kb/s
vorbis.ogg     size: 225761 o  bitrate: 87.97 kb/s

I distinctly hear a loss of quality in the vorbis encoding, and not in the
libvorbis one.

Obviously, this can not count as a serious comparison, but I think it is
enough to justify further experiments.

Regards,

-- 
  Nicolas George
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