[FFmpeg-user] Sharing an audio encode among two outputs

[Moritz Barsnick]

On Mon, Nov 07, 2016 at 17:00:52 +0900, PSPunch wrote:
> Is there a way to brush this up, do the audio encode just once?
> A solution in a single process would be ideal. As CPU load is low  
> anyway, I would prefer to keep this in a single instance if piping is  
> the only solution.

I haven't tried, but the "tee" muxer should be able to do that. The
documentation even covers your specific case:
https://trac.ffmpeg.org/wiki/Creating%20multiple%20outputs#Teepseudo-muxer

See the part about "If you want to choose specific streams then use the
stream option." (Whereby it actually means the "select" option.)

HTH,
Moritz