If you ever need to determine the length of one or more video files (MP4 files) on a MacOS system, I can confirm that this ffmpeg command works: for f in `ls FINAL*mp4`; do ffmpeg -i $f 2>&1 | grep "Duration"| cut -d ' ' -f 4 | sed s/,//; done
When you run it from the MacOS Terminal, you will see output like this: 00:03:15.07 00:18:09.83 00:11:34.03 00:06:47.83 00:05:33.13
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