[FFmpeg-devel] Help required for testing ALAC encoder

Jai Menon realityman
Mon Jun 9 05:46:12 CEST 2008

On Monday 09 Jun 2008 8:10:22 am Justin Ruggles wrote:
> Hi,
> Mike Melanson wrote:
> > Jai Menon wrote:
> >> Hi,
> >>
> >> The ALAC encoder being written as part of GSoC 2008 is steadily
> >> progressing and it would be very helpful to have people who might have
> >> access to the latest iTunes/Quicktime or an iPod to help with testing.
> >
> > No problem. I can help with all 3. Is the code ready for testing now?
> Testing can definitely start.  The files which are generated should be
> valid ALAC and decode losslessly.  Compression is not good yet since no
> prediction is used, only entropy coding.
> Since seeing Baptiste's earlier email, I've been testing using wine.  I
> was able to get Quicktime installed, and it played the files
> correctly.  I also installed iTunes (which broke my Quicktime install)
> and it also played the files correctly.  I'm guessing that it installed
> a different version of Quicktime since the standalone player stopped
> working.
> There is a known issue with the uncompressed mode, but I expect Jai will
> fix it soon.

As soon as the next few exams are over :-) , it should work with FFmpeg's ALAC 
decoder in the meantime if anybody does want to experiment.

> It would be great to have as much testing done as possible.  Right now
> it should be relatively stable since the current settings are matched to
> those in iTunes-generated samples.  When more experimenting is done,
> things might get less predictable.

My thoughts exactly.

> -Justin


Jai Menon
<realityman at gmx.net>

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