Thank you very much Paul! This info is very helpful.
Erik Sent from my iPhone > On Jun 19, 2024, at 03:03, Paul B Mahol <one...@gmail.com> wrote: > > On Wed, Jun 19, 2024 at 1:54 AM Erik Beck <ba...@tahoma.com> wrote: > >> Hi all, >> >> I'm having conceptual issues using the backgroundkey filter. >> >> Is it intended to take a still image of a static background and remove >> it from a video stream? If so, I could use help with the filter syntax. >> If not, I need to be set straight. >> > > backgroundkey filter uses single input only video stream and produces > single output only video stream, > and uses also scene detection to update alpha mask, this is controlled by > the filter threshold option. > > Demo: > > ffmpeg -i https://media.xiph.org/video/derf/y4m/bowing_cif.y4m -vf > "backgroundkey=threshold=0.2:similarity:0.02[v];color=s=cif:c=lime[c];[c][v]overlay=format=yuv422,format=yuv422p" > out.y4m > > > The more trivial, rudimentary technique, taking single still image of > supposed background and produce alpha mask with combination of input video, > is also possible, but not with backgroundkey filter, instead using several > different video filters in non-trivial combination... > > > >> >> Thanks! >> >> Erik >> _______________________________________________ >> 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". _______________________________________________ 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".
