[FFmpeg-devel] [PATCH] HE-AAC v1 decoder try 4
Wed Feb 17 09:44:24 CET 2010
Alexander Strange wrote:
> On Feb 16, 2010, at 6:19 PM, Alex Converse wrote:
>> On Tue, Feb 16, 2010 at 6:01 PM, Alex Converse<alex.converse at gmail.com>wrote:
>>> *All the computation time is spent in ff_sbr_apply() and it's
>>> children. If it isn't called from ff_sbr_apply() making it 100% faster
>>> isn't going to buy us anything.
>>> *Right now the synthesis filterbank is written on top on an MDCT. With
>>> appropriate SIMD functions it may make sense to move it to an FFT.
>>> Right now the MDCT version is much faster.
>>> *SIMD placeholder patch not included
>> Wrong patch.
>> try 4.1 :)
> I tried it with ffplay and it plays 2x too slow. If ffplay needs to be fixed, I wonder if other players will too? Well, it's unavoidable anyway.
> ffmpeg to wav sounds fine.
guess its the issue that the container signals the smaller (non-sbr) sample rate, e.g. 24khz and the decoder applies SBR
and returns 48kHz. I had to fix my player to switch to the decoder returned sample rate too...
More information about the ffmpeg-devel