On 22/12/15 18:53, batguano999 wrote:


This tells me to use aac_adtstoasc to fix it but as usual cannot quite
get the command. What is the -bsf:a aac_adtstoasc command...

That's OK (bsf=bit stream filter).
Add "-bsf:a aac_adtstoasc" to your command and try again like this...

ffmpeg -i foo.mp3 -c copy -bsf:a aac_adtstoasc foo.m4a

Batguano,

My "new" portable player will not play aac files (my old one did so this is frustrating). I tried converting aac to m4a using ffmpeg and failed with the same suggestion to use aac_adtstoasc. I've just tried your command line and it works - thank you.

I have a supplementary ... is there a Linux command that would apply that line to all aac files in a folder, taking the existing name.aac and using it to output name.mp4? Something like a Windows wild card which would ren *.aac to *.m4a? All the file names are as gip/BBC delivered them so they are complex, with underscore characters and date/time stamps.

Then, if it could recursively do that to each folder beneath the upper level - well, that really would be the icing on the cake.

Thank you.

Clive


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