On Wed, 16 Dec 2020 18:25:59 +0100 Michael Koch <astroelectro...@t-online.de> wrote:
>Am 16.12.2020 um 17:34 schrieb adam smith via ffmpeg-user: >> Hi guys, >> >> I am looking at turning 16x9 content into 1x1 >> I want to be able to specify the source area that should be used for >> the output in 1 second increments and move between them smoothly. >> >> It looks like I could perhaps use the crop filter or the zoompan >> filter to achieve this. Does anyone have any reasons why one would >> be better than the other? > >I think in this case it's better to use the crop filter, because it >supports commands. > >ffmpeg -i in.mp4 -lavfi sendcmd=f=coord.cmd,crop@1=w=800:h=800:x=0:y=0 >out.mp4 > >You can specify the top left coordinates of the square window in the >file "coord.cmd": > >0.0-1.0 [expr] crop@1 x 'lerp(0,100,TI)'; >0.0-1.0 [expr] crop@1 y 'lerp(0,100,TI)'; >1.0-2.0 [expr] crop@1 x 'lerp(100,150,TI)'; >1.0-2.0 [expr] crop@1 y 'lerp(100,220,TI)'; >2.0-3.0 [expr] crop@1 x 'lerp(150,80,TI)'; >2.0-3.0 [expr] crop@1 y 'lerp(220,220,TI)'; >and so on... > >In this example linear interpolation is used in the intervals. >For more info about 'sendcmd' see also chapter 2.80 in my book: >http://www.astro-electronic.de/FFmpeg_Book.pdf wow, the book is a great work, awesome!!! > >Michael > >_______________________________________________ >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". -- Best regards, Lingjiang Fang _______________________________________________ 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".