Hey Jeanette,
The ffmpeg mailing list is probably the best place to
ask if you don't get an answer here. For their generous help,
they request that you include the uncut console output
and to bottom-post when replying.
ffmpeg-user(a)ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-user
ffmpeg-user-request(a)ffmpeg.org with subject "unsubscribe".
Joel
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Joel Roth