On Wed, 29 Sep 2021 09:45:43 +0200, Bo Berglund <bo.bergl...@gmail.com> wrote:
>I am recording news streams off of the Internet using an automated system >during >my nights so I can view them at daytime in my time zone. This works OK but... > >Is there a way to have ffmpeg detect where in the video commercials start and >end? >One item that is different between the program and the commercial is that in >the >program there is a logo at a fixed position on screen (MSNBC, CNN or the like). > >Can ffmpeg be set up to detect the start and end of scenes containing this logo >and produce a clip text file with the start and duration of these video >sections? >Or better yet make an output video only containing the scenes with the logo? > >Or is there a different working way to do this? I searched similar questions and found this regarding blackdetect filter on stackoverflow: https://stackoverflow.com/questions/18722747/can-you-put-the-result-of-a-blackdetect-filter-in-a-textfile-using-ffmpeg/32757533#32757533 It uses ffprobe and I tested it on one of my 64 minute videos and it could detect a number of black sections with start/end pairs: ffprobe -f lavfi -i "movie=myvideo.mp4,blackdetect[out0]" -show_entries tags=lavfi.black_start,lavfi.black_end -of default=nw=1 -v quiet But in this case there were a number of false detections as well (black sections within a commercial block) and each output was duplicated tike this: TAG:lavfi.black_start=55.533 TAG:lavfi.black_start=55.533 TAG:lavfi.black_end=57.833 TAG:lavfi.black_end=57.833 TAG:lavfi.black_start=778.467 TAG:lavfi.black_start=778.467 TAG:lavfi.black_end=779.067 TAG:lavfi.black_end=779.067 TAG:lavfi.black_start=839.033 TAG:lavfi.black_start=839.033 TAG:lavfi.black_end=839.067 TAG:lavfi.black_end=839.067 So it is hard to use as base for cutting out the commercials. What I would like is a detection like this but instead of blackness using a defined image and possibly position on the screen as the item to find. If I could get a list of times where the image is present (start/end pairs) it would be the wanted solution. If the "filter" could be done to output start-end time pairs I could use this to automate commercial removal.... -- Bo Berglund Developer in Sweden _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
