Audio Track and Subtitles Names Translation

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Code:

ffmpeg -i "[input_file]" -c copy -metadata:s:s:0 title="Français" -metadata:s:s:0 language="fra" "[output_file]"

There doesn't appear to be any metadata. You can set this for audio tracks as well, either with mkvmerge or ffmpeg:

Code:

ffmpeg -i "[input_file]" -c copy -metadata:s:a:[track_index] title="Français" -metadata:s:a:[track_index] language="fra" "[output_file]"

Track indices start at 0, so if French is the first audio track, the track_index would be 0. If it's the second, track_index is 1.