[FFmpeg-devel] Ableton live aiff file

[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.