[FFmpeg-devel] Ableton live aiff file

[Andreas Rheinhardt]

Kieran O Leary:
> On Fri, 20 Sep 2019, 08:58 Adam Johnson, <me at adamj.eu> wrote:
> 
>> I have some aiff files in my music production library that I'd like to
>> convert to flac. However they aren't recognized by ffmpeg:
>>
>> $ ffmpeg -i Raylon-190-Full.aif
>> ...
>> [aiff @ 0x7fc3ce800000] unknown or unsupported codec tag: able is not
>> implemented. Update your FFmpeg version to the newest one from Git. If the
>> problem still occurs, it means that your file has a feature which has not
>> been implemented.
>> [aiff @ 0x7fc3ce800000] If you want to help, upload a sample of this file
>> to ftp://upload.ffmpeg.org/incoming/ and contact the ffmpeg-devel mailing
>> list. (ffmpeg-devel at ffmpeg.org)
>> [aiff @ 0x7fc3ce800000] could not find COMM tag or invalid block_align
>> value
>> Raylon-190-Full.aif: Operation not permitted
>>
>> These files can only be decoded by Ableton Live. Quicktime, VLC, MPlayer,
>> and ffmpeg can't read them. I believe the 'able' tag is Ableton's
>> proprietary format. I know it's 24 bit but no more.
>>
>> I exported one through Ableton to a 44.1khz 24 bit wav and the filesize
>> comes out exactly the same so I know the format is not compressed. Also the
>> exported wav matches the waveform precisely since if I add it back  with
>> inverted phase I hear nothing.
>>
>> Here is a sample file, in aif format and wav format:
>>
>> https://files-adamj-eu.s3.amazonaws.com/ffmpeg-devel/Raylon-190-Full.aif
>> https://files-adamj-eu.s3.amazonaws.com/ffmpeg-devel/Raylon-190-Full.wav
> 
> 
> This list is for posting patches,you should post on ffmpeg-user instead. It
> might make sense to also post an aiff output if possible via Ableton. I
> wasn't clear from your post of the aiff file was an export from Ableton, or
> raw capture files stores in a working directory.
> 
> Best,
> 
> Kieran.

The message from avpriv_request_sample explicitly says that one should
contact ffmpeg-devel, so this is the right ML for his message.

- Andreas