On Fri, May 31, 2024 at 6:48 PM Sean Grider via ffmpeg-user < ffmpeg-user@ffmpeg.org> wrote:
> I'm trying to use ffmpeg to find timestamps of a video where a given > screenshot can be found. > > Let's say of 30m video, there's a title card at 00:07:00, so I extract > that frame as an image with: > > ffmpeg -i INPUT -qmin 1 -qscale:v 1 -vframes 00:07:00 -f image2 match.png > > Now I want to find any frames in a video stream that roughly match that > captured frame. I'm using this ffmpeg command: > > ffmpeg -i INPUT.mkv -loop 1 -i match.png -an -filter_complex > "blend=difference:shortest=1,blackframe=90:20" -f null - > > Now I think it's sort of working, but I have a few questions: > > - Can anyone offer any better commands for what I'm trying to accomplish. > All of these commands were found via search and trial and error > - The output of the second command shows all of the frames that match, so > I think I can parse that output to determine how many contiguous matches > there are, but the output is given in frames, pts and t. I assume t means > time, but the t value does not correspond at all to the actual timestamp > format (00:00:00) of the video. How can I convert the t value into the > actual timestamp format? > t is in seconds. > - Can anyone offer any help or documentation on how the blend/difference > filter works? I'm not really clear on what my 90:20 value actually means. > > There is documentation of filters. > Thanks > > Sent with [Proton Mail](https://proton.me/) secure email. > _______________________________________________ > 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". > _______________________________________________ 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".
