[FFmpeg-user] Crop 4K Video into Four 1080p Videos?

Clay D. Montgomery clay at montgomery1.com
Mon Jun 26 23:33:56 EEST 2017

Thank You Gyan!

On 6/26/2017 2:02 PM, Gyan wrote:
> On Mon, Jun 26, 2017 at 11:58 PM, Clay D. Montgomery <clay at montgomery1.com>
> wrote:
>> Hello,
>>      I'm wondering if it is possible to use ffmpeg to slice 4K video into a
>> set of four 1080p videos and do it without scaling.
> You need to use the crop filter. For four distinct outputs,
>      ffmpeg -i input -vf crop=1920:1080:0:0 output1 -vf
> crop=1920:1080:1920:0 output2 -vf crop=1920:1080:0:1080 output3 -vf
> crop=1920:1080:1920:1080 output4
> (I've ignored audio. The above command will transcode it. Add -c:a copy
> before each output to avoid that)
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