"Maybe" with avisynth and a special input, but in general donations welcome to make the dshow module able to do this :) On Mon, Jul 18, 2022 at 10:35 PM ashwin Nair <annrwork92@gmail.com> wrote:

Hi All,

I have 3 USB cameras streaming video at a specific resolution. I am trying to merge the videos together using hstack and display using ffplay.

This is the command I am using:

ffmpeg -f dshow -pix_fmt uyvy422 -video_size 1280x2160 -i video="CAM_0" -f dshow -pix_fmt uyvy422 -video_size 1280x2160 -i video="CAM_1" -f dshow -pix_fmt uyvy422 -video_size 1280x2160 -i video="CAM_2" -filter_complex hstack=3 -f nut - | ffplay -

There is a special case in this system. The USB Camera system will only start video stream only when 3 cameras are enabled (or started by ffmpeg). However when I am using the above command, ffmpeg starts CAM_0 and waits for data. As a result CAM_1 and CAM_2 are not started and video stream does not start.

Is there any way where I can start all 3 inputs simultaneously using ffmpeg and then merge them together using hstack?

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