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Old 19th May 2010, 01:20   #11  |  Link
Abradoks
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Join Date: Mar 2008
Posts: 71
Quote:
Originally Posted by jruggle View Post
1) If FFmpeg is modified to give floating-point output will the results be closer to eac3to.
I don't know how to modify that patch to make it work with ffmpeg. If I apply it as is, ffmpeg outputs noise. So maybe someone else can check it?

Quote:
Originally Posted by jruggle View Post
3) See what the Nero decoder does compared to liba52 and libavcodec.
Nero make it even more confusing. Here are files. *-eac3to-nero.flac were decoded with eac3to; *-nero.flac with Nero 10 decoder and Graphedit.
Graphs:

So, eac3to-nero "looks" like ffmpeg for 5a.ac3, like liba52 for 224.ac3 and like eac3to-libav for 640.ac3.
I was surprised even more, when I compared SNR results:
Code:
5a-eac3to-libav: 27.194   dB  (Gain for File B = 1.0009)
5a-eac3to-nero: 28.607   dB  (Gain for File B = 0.99991)
5a-ffmpeg: 29.057   dB  (Gain for File B = 0.99994)
5a-nero: 28.625   dB  (Gain for File B = 1.5873)
5a-foo-liba52: 28.822   dB  (Gain for File B = 0.99985)

224-eac3to-libav: 16.188   dB  (Gain for File B = 0.99912)
224-eac3to-nero: 16.18    dB  (Gain for File B = 0.99182)

224-ffmpeg: 13.399   dB  (Gain for File B = 1.2648)
224-nero: 13.4     dB  (Gain for File B = 2.0076)

224-foo-liba52: 16.166   dB  (Gain for File B = 0.99174)

640-eac3to-libav: 27.809   dB  (Gain for File B = 0.99982)
640-eac3to-nero: 27.813   dB  (Gain for File B = 0.99982)

640-ffmpeg: 16.091   dB  (Gain for File B = 1.2752)
640-nero: 16.091   dB  (Gain for File B = 2.0243)

640-foo-liba52: 27.537   dB  (Gain for File B = 0.99971)
Also, I've got 5a.ac3 decoded with Cyberlink PowerDVD 10. 5a-cyber.flac:

SNR = 28.844 dB (Gain for File B = 1.5872)
As you can see, Cyberlink hasn't that problem with attenuation of high frequencies.
Can anyone check these samples with Windows 7 decoder? Or maybe even with reference decoder?

Quote:
Originally Posted by jruggle View Post
What program did you use to make the graphs? I want to use it in my comparisons as well.
Sound Forge. AFAIK baudline can provide same functionality.
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