[FFmpeg-user] MKV With Multiple Audio Streams

[Francois Visagie]

> -----Original Message-----
> From: ffmpeg-user [mailto:ffmpeg-user-bounces at ffmpeg.org] On Behalf Of
> Gabriel Altabarani
> Sent: 28 July 2016 11:03
> To: ffmpeg-user at ffmpeg.org
> Subject: [FFmpeg-user] MKV With Multiple Audio Streams
> 
> So I have an MKV video file with the following streams:
> 
> 
> 
> Stream#0:0: Video
> 
> Stream#0:1: Audio
> 
> Stream#0:2: Subtitle
> 
> Stream#0:3: Audio
> 
> Stream#0:4: Attatchment
> 
> Stream#0:5: Attatchment
> 
> Stream#0:6: Attatchment
> 
> 
> 
> I just want Stream#0:0 and 0:3. However I don't want to re-encode, I just
> want to change containers to mp4/webm.
> 
> The only way I've gotten it to work is by using this line of code:
> 
> 
> 
> ffmpeg -i "Ep.1 Mirai Nikki [Future Diary] (Dual Audio) 1080p.mkv" -map 0 -c:v
> copy -map -0:a:0 -map -0:s:0 -map -0:t:0 -map -0:t:1 -map -0:t:2
> OUTPUT.mp4
> 
> 
> 
> But even then I still have to re-encode the second audio stream. My
> question, is there a way to change the container and select one of the audio
> streams without re-encoding at all?

You have to specify the 'copy' codec for audio also, either by adding '-c:a copy', or better yet replacing '-c:v copy' with '-c copy'.

I'm a little rusty on this so please check my syntax, and you may also need to be careful with command line option sequencing.

> 
> 
> 
> Thanks,
> 
> Gabe
> 
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