Elgato CamLink: only 50fps

A

albertocv

Member
I installed an Elgato Camlink 4K. I successfully added it in OBS.
The only available framerate is 50fps, though. Do you know why?
 
In OBS I set 30fps.
In the video source properties dialog I can only select 50fps, Match output FPS or Highest FPS.
If I choose any of those, the recording comes out jerky.
 
Cam link check hdmi autonegotiation.
On A5100 switch from PAL to NTSC signal this probably change to 60FPS.
Not too much cameras can send 25 or 30fps via hdmi, typical value is 50i or 50p or 60i or 60p (of course is 59,94 fps or 29,97fps).
 
Tomasz Góral said:
Cam link check hdmi autonegotiation.
On A5100 switch from PAL to NTSC signal this probably change to 60FPS.
Not too much cameras can send 25 or 30fps via hdmi, typical value is 50i or 50p or 60i or 60p (of course is 59,94 fps or 29,97fps).
Click to expand...
Do you mean that this way the Cam Link FPS would be a multiple of my OBS fps?
 
You can change FPS only on camera, CamLink is passive, this device only receive FPS who send camera.
If you set in camera 50FPS - CamLink receive 50FPS and send to OBS.
In OBS you can change FPS rate, but must remember about one important rule use double or more or half FPS source, if you set 30FPS and 50FPS from source you can see visible 'screen tearing' or jumping frames.
 
Tomasz Góral said:
You can change FPS only on camera, CamLink is passive, this device only receive FPS who send camera.
If you set in camera 50FPS - CamLink receive 50FPS and send to OBS.
In OBS you can change FPS rate, but must remember about one important rule use double or more or half FPS source, if you set 30FPS and 50FPS from source you can see visible 'screen tearing' or jumping frames.
Click to expand...
Thanks. Didn't read it anywhere. Even the Elgato support didn't tell me.

It seems that Sony alphas' HDMI output is locked at 50p. Combined with your information, it's the explanation of my issue.

So, for best performance in OBS, I should set the output to 50fps, right?
 
albertocv said:
Thanks. Didn't read it anywhere. Even the Elgato support didn't tell me.

It seems that Sony alphas' HDMI output is locked at 50p. Combined with your information, it's the explanation of my issue.

So, for best performance in OBS, I should set the output to 50fps, right?
Click to expand...
I tried and I confirm now it's working. There was an additional detail: if you don't connect the Cam Link to a USB 3.0 port, the recording is jittery.
 
I have the same problem as the OP. My Nikon can output 60p trough HDMI, elgatos 4k capture utility software sees 60fps, but in OBS I can only select 30. . .
 
do_ob said:
I have the same problem as the OP. My Nikon can output 60p trough HDMI, elgatos 4k capture utility software sees 60fps, but in OBS I can only select 30. . .
Click to expand...
This would be the Camlink failing to enumerate the higher rate. You'll need to reach out to Elgato support for assistance with their hardware.

And as noted above, if you only have 50fps available on a Sony camera, make sure you set its HDMI output to NTSC, not PAL. PAL is limited to 50fps. NTSC is not.
 
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