[FFmpeg-user] cropdetect (Was: ffmpeg convert to wrong duration using dvd2concat)

[Moritz Barsnick]

Regarding cropdetect:

On Wed, Jan 20, 2016 at 11:31:50 -0500, Etienne Desautels wrote:
> [Parsed_cropdetect_1 @ 0x40b8900] x1:719 x2:0 y1:479 y2:0 w:-718 h:-478 x:720 y:480 pts:6006 t:0.066733 crop=-718:-478:720:480

I have noticed dimensions like this before. Are they actually useful?
What do they produce if fed to the crop filter (e.g. via metadata)?

I realize they represent "empty" frames, where "everything" is cropped.
Does something need fixing here? (I started an attempt a few months
ago, but got distracted by life.)

Moritz