[FFmpeg-devel] [FFmpeg-devel-irc] IRC log for 2010-03-27

[Frank Barchard]

On Tue, Mar 30, 2010 at 9:23 AM, Michael Niedermayer <michaelni at gmx.at>wrote:

>
> if wma sounds better than aac then there must be a pretty nasty bug in the
> aac encoder
>
>
Instead of 'sounds better', is there a good metric?
Running tiny_psnr on some audio tracks, the numbers do look suspicious.
mp3 stddev: 3965.61 PSNR: 32.59 bytes: 84256244/ 84266496 (lame/ffmpeg).
size 11 MB
ogg  stddev:  296.70 PSNR: 46.88 bytes: 84256244/ 84260096 (oggenc/ffmpeg).
size 6 MB
aac stddev: 4015.37 PSNR: 31.92 bytes: 84256244/ 84262912 (faac/ffmpeg).
size 7.2 MB
wma1 stddev: 3877.18 PSNR: 34.10 bytes: 84256244/ 84262912 (ffmpeg/ffmpeg).
size 4 MB.
he-aac stddev:  288.77 PSNR: 47.12 bytes: 84256244/ 84256240 (nero/nero).
size 10 MB
But PSNR doesn't account for phase shift, so it may be a bad metric for
audio.