[FFmpeg-trac] #4719(undetermined:new): ffmpeg feature request: new cropdetect based on motionlessness

FFmpeg trac at avcodec.org
Tue Jul 14 08:43:40 CEST 2015


#4719: ffmpeg feature request: new cropdetect based on motionlessness
-------------------------------------+-------------------------------------
             Reporter:  pat284e      |                     Type:
               Status:  new          |  enhancement
            Component:               |                 Priority:  normal
  undetermined                       |                  Version:  2.7
             Keywords:  "motionless  |               Blocked By:
  pictorial belt", "pictorial outer  |  Reproduced by developer:  0
  frame", "pictorial outer rim",     |
  "motion-based cropdetect",         |
  "motionlessness-based cropdetect"  |
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 The filter "cropdetect" is helpful to crop off black rectangular rim or
 black outer belt.  However, I need to crop off a motionless pictorial belt
 that surrounds a motionful video content.  A motionless pictorial belt
 that surrounds a motionful video content may be thought of as a big still
 picture into which a small video is overlaid.  (Note that the size and
 location of the small video inside the big picture is steady and
 immutable.)

 So, I need a new different kind of "cropdetect" that works based on
 motionlessness but not on blackness.

 I will try to attach or upload an example video.  Here is the code that
 composed the sample video.

 ffmpeg -f image2 -loop 1 -t 6 -thread_queue_size 500 -i BigPicture.png -i
 SmallVideo.mp4 -filter_complex "overlay=140:50" -vcodec h264
 VideoWithPictorialBelt.mp4

 What I need is to extract the small video by removing the surrounding
 motionless pictorial belt.  I need some automatic detection of appropriate
 parameters for the crop, when I do not know the parameters or when it is
 difficult for me to find the parameters.

 Key words: "motionless pictorial belt", "pictorial outer frame",
 "pictorial outer rim", "motion-based cropdetect", "motionlessness-based
 cropdetect"

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Ticket URL: <https://trac.ffmpeg.org/ticket/4719>
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