Conflict between "Video Capture Device" and "Video Capture Device with Replay Buffer"

[Héraès]

Hello,

I have a massive bug making my HDMI capture and/or my Webcam to simply stop displaying.

Either it's one or the other, or the two at the same time. I discover a mechanism implying that I was using "Video Capture Device" for my HDMI capture and that wasn't working anymore, but strangely when using "Video Capture Device with Replay buffer" it was working again.

And I discover an other mecanisme wich is my webcam suddently stop working, and when using "Video Capture Device with a Replay buffer" it was working again... but my HDMI capture (blabla with replay buffer) stopped working !!

Sometimes, I have to restart OBS because I can't set my shortcuts because it doesn't detect sources in the right GROUP even I just moved those sources in the group (in a scene I was working on), so I restart just for that, and boom, both devices stop displaying ! O_o

So, gentlemen, are you testing your product or not ?

 

[Héraès]

I confirmed that I have to HIDE the webcam for example, for the HDMI capture to reappear (by clicking twice on the EYE icon of its source).
The opposite is true : I have to HIDE the HDMI source to make the Webcam to reappear.
But both can't be at the same time.

I have two sets for both HDMI capture and the webcam : one with "Video Capture Device", the other with "Video Capture Device with Replay buffer".

Webcam "Video Capture Device" works if HDMI "Video Capture Device with Replay buffer" is hidden.
Webcam "Video Capture Device with Replay buffer" works if HDMI "Video Capture Device with Replay buffer" is hidden.
HDMI "Video Capture Device" doesn't work at all, so I can't test with it (it was working months ago).
HDMI "Video Capture Device with Replay buffer" works if Webcam "Video Capture Device" is hidden.
HDMI "Video Capture Device with Replay buffer" works if Webcam "Video Capture Device with Replay buffer" is hidden.

 

[Héraès]

Solved ! Turns out it was a problem of USB2.0 bandwith : https://obsproject.com/forum/threads/webcam-and-capture-card-unable-to-work-at-the-same-time.134687/

I had to change ports several times until I found a way to make them work together. Moreover, it seems (not sure) that there was maybe a bad connection due to the cable of the HDMI card.

 

[Héraès]

Woops ! Talked to fast. I managed to have both displayed, but OBS crashed as soon as I pushed the STREAM button. When relaunched, the HDMI source is gone again.
Back again to testing ports/cables. I'm 99,999999% sure it's OBS that is responsible. Can't be a USB problem for that long.

My MOBO is a ASUS P6T Deluxe V2. Can't believe there is a unique USB2 host controller for all the ports...

 

[R1CH]

If you're adding the same device multiple times, make sure to use "Add existing". A device can only be accessed by a single source or program. Also a log would be useful. https://obsproject.com/forum/threads/please-post-a-log-with-your-issue-heres-how.23074/