pssturges wrote: 
> So a lot of info tools seem to analyse the data rather than use the
> header? ffmpeg clearly does and shows 24bit. Below is the mediainfo
> output. That would be from analysing the audio stream rather than the
> header? I would like to be able to have a closer look at the header. Are
> there any tools you would suggest? Preferably linux or mac.

I use mp4file with --dump which display the tags in a tree form but
collapses long arrays (e.g. offset table) but if I want more detail add
the debug (-d ?) option.
I hope this is so that you can file a bug report with ffmpeg developers.


I've looked at ffmpeg code (libavcodec/alacenc.c) and AFAICT the problem
could be  associated with the input sample size not being 24 bit - as
flac embeds 24bit in 32 bit sample. if the input sample is 24bit then
alac tag gets 24 bit entered. This is a ffmpeg bug.


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