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  1. 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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  2. I am PLEABS
    Join Date
    Apr 2018
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    Search Comp PM
    you can just edit metadata with ffmpeg

    this is the code to change the first audio stream language into english
    Code:
    ffmpeg -i "your_File_path_here.mp4" -c copy -metadata:s:a:0 language=eng "your_destination_file_path.mp4"
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  3. 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.
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  4. I am PLEABS
    Join Date
    Apr 2018
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    Earth
    Search Comp PM
    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
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