[FFmpeg-devel] OSX AudioToolbox codec support

Robert Kr├╝ger krueger at lesspain.de
Wed Mar 2 08:37:34 CET 2016


On Tue, Mar 1, 2016 at 11:06 AM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:

> Rodger Combs <rodger.combs <at> gmail.com> writes:
>
> > This series adds decoders and encoders based on OSX's AudioToolbox
> framework.  They may be faster than the native ones (particularly in
> > cases where they can be hardware-accelerated), the encoders are
> > competitive on quality, and some
>
> I think this is a great addition to FFmpeg!
>
> > users may find them convenient from a licensing perspective.
>
> I believe it makes no difference.
>

It does IMHO. IIRC shipping a product with ffmpeg's aac requires you to pay
patent fees to the patent holder. Using the aac encoder from the platform
is different because the aac encoder is delivered by the platform and Apple
has already payed patent fees.


>
> > ADPCM_IMA_QT can also be encoded by AudioToolbox, but I couldn't
> > figure out how to get it working properly, so it's left with
> > just the decoders.
>
> > I'm not sure if the alaw/ulaw and IMA codecs are worth having
> > at all since they're so simple; I just threw them in since
> > they were easy.
>
> Please keep them.
>
> > The ALAC encoder and decoder have been tested as bitexact.
>
> Also with our implementation?
>
> Please mention ticket #4828 in the commit message and please
> bump minor, not micro.
>
> Thank you, Carl Eugen
>
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