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Convert m4a with cover to mp4

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I've a m4a file with cover attached using mp4art; however Youtube doesn't support m4a. Supported formats - https://support.google.com/youtube/troubleshooter/2888402?visit_id=637603848977966877-3323728279&hl=en-GB&rd=1 Thus I need to convert m4a with cover image to mp4. Using brew's ffmpeg didnt help
$ brew install ffmpeg
$ ffmpeg -i input.m4a output.mp4
[mp4 @ 0x7fbb6100de00] Could not find tag for codec h264 in stream #0, codec not currently supported in container
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Error initializing output stream 0:1 -- 
[aac @ 0x7fbb60015c00] Qavg: nan
Conversion failed!
Asked by Chaitanya Bapat (101 rep)
Jun 27, 2021, 10:06 AM
Last activity: Jun 27, 2021, 10:25 AM