[FFmpeg-user] Pan and scan

Lingjiang Fang vacingfang at foxmail.com
Thu Dec 17 04:21:48 EET 2020

On Wed, 16 Dec 2020 18:25:59 +0100
Michael Koch <astroelectronic at 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 at 1=w=800:h=800:x=0:y=0 
>You can specify the top left coordinates of the square window in the 
>file "coord.cmd":
>0.0-1.0 [expr] crop at 1 x 'lerp(0,100,TI)';
>0.0-1.0 [expr] crop at 1 y 'lerp(0,100,TI)';
>1.0-2.0 [expr] crop at 1 x 'lerp(100,150,TI)';
>1.0-2.0 [expr] crop at 1 y 'lerp(100,220,TI)';
>2.0-3.0 [expr] crop at 1 x 'lerp(150,80,TI)';
>2.0-3.0 [expr] crop at 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:

wow, the book is a great work, awesome!!!

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Best regards,
Lingjiang Fang

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