Stereo Camera Synchronization

[Reuven Wachtfogel]

If your tolerance is indeed close to zero difference, I believe you will
need h/w support in the cameras. For example,
https://www.youtube.com/watch?v=gqbn4ME_q20

On Thu, Apr 20, 2023 at 4:54 PM Dwight Kulkarni via gstreamer-devel <
gstreamer-devel at lists.freedesktop.org> wrote:

> Hi all,
>
> I have two cameras with independent pipelines, the camera ends in an
> appsink where the jpeg frames are consumed.
>
> The problem is that I need to extract the jpeg frames from both cameras at
> exactly the same time. There can't be slight time differences between the
> two images. This is for stereo image analysis.
>
> Right now, I terminate the pipeline in an appsink and then consume the
> Jpeg frames that get outputted.
>
> If each camera runs on a separate pipeline I will get two different
> callbacks that contain the JPEG image and there is no guarantee that both
> images are in synch unless there is something from gstreamer that can synch
> them.
>
> Alternately, we can change the camera driver so that the raw video coming
> out of the ISP is being stitched into a frame that's twice as large and
> then maybe crop the image in gstreamer when recording the video to select
> only one camera but the Jpeg frame being returned will contain both frames
> already synched.
>
> Before pursuing these ideas, I was hoping for any comments on what is the
> best practice.
>
> --
> Sincerely,
>
> Dwight Kulkarni
>
>
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