Author Topic: ALAC streams being reported as AAC  (Read 4332 times)


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ALAC streams being reported as AAC
« on: October 28, 2014, 21:40:50 »
I have files ripped to ALAC (m4a container), using dbPowerAmp. 
VLC Media Player properly reports that these m4a files contain ALAC streams. 
But, when Similarity reads these files, it reports them as AAC. 
Since QuickTime is doing the decoding, this seems to raise 3 possibilities.
  • Similarity is asking QT to transcode ALAC to AAC on the fly
  • QT is doing the transcoding on its own, without being asked
  • Similarity is simply reporting the wrong stream type
Anyone know what's going on here?


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Re: ALAC streams being reported as AAC
« Reply #1 on: November 02, 2014, 01:00:56 »
Similarity doesn't transcode between compressed formats it just "asks" decoders to give him pure PCM audio stream, then work with this audio data. In your situation it's just wrong stream format, our QuickTime decoder doesn't fill stream type, this field filled by file extension parser. We try to change this behaviour in next version.