[FFmpeg-devel] Error in ATRAC1 decoder?
dan.cherednik at gmail.com
Sat Nov 14 00:59:30 CET 2015
I have noticed if decode
file by ffmpeg we got aliasing near 11025Hz. Screenshots:
I was tried to solve it:
ATRAC1 - hybrid codec, has two stacked QMF and splits the signal into 3
band before MDCT. Thereby we need to compensate delay of one QMF to
There is a delay line but it looks like delay for 23 sample is not correct.
I have done some experiments and got 39 should be right delay. Results of
decoding with patch: https://yadi.sk/i/yooaIQrmkSncB
To be honest I am not a prof in math and it would be great if someone
recheck it from math perspective.
There is a patch in attach.
-------------- next part --------------
A non-text attachment was scrubbed...
Size: 1876 bytes
Desc: not available
More information about the ffmpeg-devel