Re: [bonsai-users] Issues with video acquisition and analysis using Logitech C922 webcam

[Gonçalo Lopes]

Hi Pedro,

There is a known issue with opening certain codec combinations and the .mp4 container. Usually the easiest workaround is to record in the .avi.

Sometime next year we will release a new version which should fix this for good.

Re. the C922 webcam, it's not very clear what the issue is, but I will check the other posts.

Hope this helps.

On Tue, 7 Sept 2021 at 14:44, Pedro Ferreira <pedro.bio...@gmail.com> wrote:

Hello there,

Been having some issues with video acquisition and analysis using a C922 Logitech webcam. Had to resort to using some 10yo laptops to run Bonsai (i7-2760QM, Intel® HD 3000 iGPU), and every time I tried to record from the C922 webcam, Bonsai would greet me with a System.AccessViolationException error (can't provide screenshot right now).

However, the camera works just fine with newer hardware (i7-9750H, RTX 2080 Max-Q), at least it did a couple weeks ago while I was setting up the workflow.

Presented with this situation, I decided to record video using OBS, .mp4 format, 1280x720 30FPS, but now trying to open said video with Bonsai is... problematic. It sometimes open, with partial corruption on the bottom of the video that lasts for about 100 frames, but if I rerun the workflow right after (and by workflow I mean a single FileCapture node), it presents me once again with a System.AccessViolationException - screenshot below (this time running on a AMD 5900X, 32GB RAM, RTX 3080Ti).

Any idea what might be causing this? I can try to provide additional data and one of the videos in question. Bonsai and respective packages are all updated across machines.

Thanks in advance!

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