Re: [FFmpeg-user] Pan and scan
On Wed, 16 Dec 2020 18:25:59 +0100 Michael Koch 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".
Re: [FFmpeg-user] Pan and scan
Having tried it out, this was exactly what I was looking for and makes it simple to implement. Thanks for your help Michael, you should write a book ;) Adam > On 16 Dec 2020, at 17:39, adam smith via ffmpeg-user > wrote: > > I will give it a whirl. ___ 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".
Re: [FFmpeg-user] Pan and scan
> On 16 Dec 2020, at 17:25, Michael Koch wrote: > > I think in this case it's better to use the crop filter, because it supports > commands. Thank you for your advice Michael; thanks even more for the examples to go with the advice, it is very much appreciated. I will give it a whirl. Have fun Adam ___ 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".
Re: [FFmpeg-user] Pan and scan
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 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".
[FFmpeg-user] Pan and scan
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? Thanks Adam ___ 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".
