I know how to change the audio language in mp4s but hate having to write the entire file to disk again and am looking to quicken my workflow. Does a program similar to the header editor in MKVToolNix exist but for mp4s?
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Doesn't "copy" write the whole file again? I stated that I can already do that and it's what I don't want to do.
sorry if i misunderstand the point of your "write the whole file again", i though that you simply not want to re-encode the whole file again which is take lot of time, and as for header editor, i can not recall any convenient GUI for MP4 to do that