On Tue, Aug 22, 2017, at 08:15 AM, Steve Dierker wrote: > Hello list, > > I have an MXF file with one video track and 8 audio track. I'm trying to > reencode it to MP4 while preserving all existing tracks and also adding > a mixdown of all audio tracks as the 9th track. > Right now I'm only able to do this in 2 separate FFmpeg calls and I'm > wondering whether one can do it in one call. >
ffmpeg -i input -filter_complex "[0:a:0][0:a:1][0:a:2][0:a:3][0:a:4][0:a:5][0:a:6][0:a:7]amerge=inputs=8[mix]" -map 0 -map "[mix]" output Or if you want to be lazy and blindly trust amix to choose inputs for you: ffmpeg -i input -filter_complex "amerge=inputs=8[downmix]" -map 0 -map "[mix]" output _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
