ffmpeg audio encoding based on codec and not on stream identifier
I have an RTSP Stream with one video stream and three audio streams as the source. Two of the audio streams are encoded with
.mp2 and one is encoded with
.ac-3. I want to convert the
.mp2 streams to AAC. This would be easy if the
.mp2streams would have the same stream identifier every time I start ffmpeg, but unfortunately the stream identifiers change. This means sometimes the two
.mp2 streams are 0:a:0 and 0:a:1 and the next time they are 0:a:1 and 0:a:2.
Is there an option to re-encode only the
.mp2 streams and keep the
.ac-3 stream untouched?
I should probably also mention that this encoding is used for live TV so it is not an option to produce intermediate files or have several ffmpeg commands.
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