[PATCH] Removed double re-muxing of AAC audio (national radio) to M4A

[dinkypumpkin]

On 12/02/2013 17:27, richard wrote:
> I have problem with this patch. m4a files don't play on my Marantz
> CD6003 player. They play OK on my computer using vlc etc.
>
> The reason why the double re-mux and the aac_adtstoac filter was used
> was because certain players won't play otherwise.
>
> OS Ubuntu 10.04 ffmpeg 4:0.5.9-0ubuntu0.10.04.3

The Marantz thing rings a bell now that you mention it.  I don't really 
want get_iplayer to be hostage a single piece of hardware, so if anyone 
can verify the same behaviour with other players, chime in.

For now, test a couple of more permutations:

Add the filter to direct .flv->.m4a mux:

ffmpeg -i file.flv -vn -acodec copy -absf aac_adtstoasc -y file.m4a

If your player can play unvarnished AAC, try direct re-mux to .aac:

ffmpeg -i file.flv -vn -acodec copy -absf aac_adtstoasc -y file.aac

It would also be very helpful to know if you get different results with 
a modern version ffmpeg, either from Jon Davies' PPA 
(https://launchpad.net/~jon-hedgerows/+archive/get-iplayer) or the 
lucid-backports repository.