Question / Help Elgato video lag question

[Suembeaux]

I apologize if this question has been asked before.

I am considering getting an Elgato Game Capture to stream via twitch and record some game play. I know this isn't new or anything, I just had one concern. I have seen others use this method and their game play is not synced with their webcam. I know I can delay my webcam in OBS, but after a quick google I found some users have said that the amount of time for the game play to appear on screen changes throughout sessions. I imagine this is because they were using a VBR for their encoding so when the recording bitrate is low the video catches up to real time a little. Can anyone confirm this?
Also, I have seen that there is a CBR option in the Elgato software, does this alleviate the varying lag?

Thanks in advance.

 

[bossjedizohan]

The elgato probably uses VBR to encode the live video, which causes fluctuations in the delay time. The more compression happening, the longer the delay is going to be. Using CBR would probably help, but I'm not sure as that might just be for recording and not the live input.

 

[Suembeaux]

Thanks for the reply, that is pretty much exactly what I was thinking it was.
Can anyone that has an Elgato confirm that it is a CBR setting or not? I have only used a Hauppauge HD PVR in the past and it has a CBR option.
I have seen a settings log of someone who was troubleshooting something and it had "CBR: no" in the log. I don't know if it was just turned off or can't be used with the device period.