FFMPEG – Pre-Fill File Duration Into FFMPEG’s MP3-Concatenation File-List, Using FFPROBE

This is will generate a text file filed with all the mp3 files in the folder,
it will also PRE QUERY each file using FFPROBE and will add the result to the file,
helping to avoid sync-or-duration problems.

ffprobe supports built-in formatting, which might help you avoid using external commands such as cut, sed, grep, etc… .

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