On Thu, 30 Sep 2021 14:35:27 +0200, Bo Berglund <bo.bergl...@gmail.com> wrote:
>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 I have realized from comments here that the logo detection scheme is not really workable, so I am back to using this blackdetect method. One thing tah bugs me is that the command shown above duplicates the output value on two lines, how can I make ffprobe output only one line for each detection? It would be easier to process in a script if the output was like this instead: TAG:lavfi.black_start=55.533 TAG:lavfi.black_end=57.833 TAG:lavfi.black_start=778.467 TAG:lavfi.black_end=779.067 TAG:lavfi.black_start=839.033 TAG:lavfi.black_end=839.067 Then a start is followed by an end and so on and the time between the start and end shows if a commercial insertion is found (short time between start and end) or if there is a deliberate long black section (which I would anyway want to exclude). So: - How can i modify the ffprobe command such that it outputs just one line for every start or end point? I am not clever enough to figure out how ffprobe actually works... - I notice a detection that lasts only 34 ms, could such be valid at all? It seems like a single video frame... -- 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".
