> If I decode an audible aax file using the -activation_bytes option it
> works fine for a single file, eg:
> $ ffmpeg -activation_bytes XXXXXXXX -i part-1.aax -codec copy
> BUT if I try to concat multiple files using the concat demuxer it acts
> like the -activation_bytes option isn't supplied.
> This feels like a bug?
It's a limitation. The concat demuxer doesn't accept options for the
demuxers of the individual file entries. So, you'll have to process them