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Clip+ playback: AAC/SBR 82 kbit/s - high pitch sound added

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Buschel:
Downloaded, will take a look at them tomorrow earliest. Thanks so far!

Edit: There definately *are* visible differences when comparing the spectral representation of the foobar-decoded file against rockbox's output. Do you have a chance to give a bit more information about when this came in? e.g. with which rockbox version?

saratoga:
Trying the current build I get pretty similar output to foobar.  Theres some difference (RMS error is ~16 PCM levels).  Interestingly the error isn't white, its concentrated in the SBR bands (although it looks fairly uniform there), but I'm not sure thats wrong.  IIRC the SBR signal contains a random component. 

saratoga:


http://duke.edu/~mgg6/pics/error.png

FFT of the error signal plotted on a dB scale.  Not really sure what to make of it, the error doesn't line up all that well with the SBR region after all.

grums:
Interesting!
I can't help you much with history, as my first version was 3.7.1.
(I don't listen to that record very often, but funny enough: on another track from it, with low music intensity and slow blue piano notes, OGG encoding at ~80 kbits/sec suffers, even with the newest encoders)

Buschel:
The images I have linked show a spectral view of the foobar and rockbox decoded files. You can easily spot the differences. It only seems to affect higher frequency components. A first quick guess from my side is that this might be a bug in the hf_adj/hf_gen part of the decoder...


http://img854.imageshack.us/img854/7427/foobar.jpg


http://img860.imageshack.us/img860/6277/rockbox.jpg

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