[FFmpeg-user] Always merge audio all streams?

[Francois Visagie]

> -----Original Message-----
> From: ffmpeg-user [mailto:ffmpeg-user-bounces at ffmpeg.org] On Behalf Of
> Robert Nagy
> Sent: 01 February 2016 23:53
> To: FFmpeg user questions and RTFMs
> Subject: [FFmpeg-user] Always merge audio all streams?
> 
> Is there a way to always merge all audio streams into a single one? Without
> knowing in advance how many there are?
> 
> I've tried to use the amerge filter but it requires the number of audio
> streams provided manually...

Have you tried something like '-af aformat=channel_layouts=mono' (guessing, documentation does not mention mono)?

Or '-ac 1'?

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