ffmpeg - mapping an audio file with 2 channels to a video file? I have a video file and an audio file (that contains 2 channels) and i want to map the video to stream 0 of the resulting file and the audio file to the next stream/s.

Since the audio file has 2 channels, would i have to map it to 2 separate streams? (1 and 2 of the resulting file)
Or just one stream? 

Finally, how should i go about doing that?
I've only tried mapping with video files so i'm not sure how to do it with audio ones.

Thanks!
Channels are conjoint tracks within a single stream, so a stereo audio WAV has one stream which contains two channels. If this is what you have, use

ffmpeg -i video -i audio -map 0:v -map 1:a output


If they are distinct streams, then the above command will still map all the streams, but for explicit specification, use

ffmpeg -i video -i audio -map 0:v -map 1:a:0 -map 1:a:1 output