[FFmpeg-user] ffmpeg combining live video from 3 cameras

[Roger Pack]

"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 at 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?
>
> Thanks!
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