Ensure the system can support multi channel output ffmpeg -i multichannel.mxf \ -map 0:v:0 \ -map 0:a:0 \ -map 0:a:0 \ -c:a:0 ac3 -b:a:0 640k \ -ac:a:1 2 -c:a:1 aac -b:a:1 128k \ out.mp4 https://ffmpeg.org/ffmpeg-all.html#AVOptions