Interesting....
So based on the logs, OBS itself isn't running into anything that it sees out of the ordinary -- there's no rendering or encoding lag to speak of, meaning whatever it's being sent, it's able to process it without anything being lost. Because of this, that seems to imply that whatever is going on is taking place before OBS gets the signal from your capture card.
The part where things become "normal" again with low-motion sections of gameplay is the suspect part. This is the kind of thing you would normally see in OBS if you get encoding lag, as the slower scenes are generally easier to compress since there's less happening. But, since OBS is seemingly fine, that puts the focus more on the input, and this line:
20:54:22.086: [DShow Device: 'Dispositivo de captura de video'] settings updated:
20:54:22.086: video device: AVerMedia C835 Capture
20:54:22.086: video path: \\?\usb#vid_07ca&pid_c835#202898000315#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\{957bd672-7934-4b55-b81a-3e22b14c679a}
20:54:22.086: resolution: 720x480
20:54:22.086: fps: 59.94 (interval: 166833)
20:54:22.086: format: H264
20:54:22.086: using video device audio: yes
20:54:22.086: sample rate: 48000
20:54:22.086: channels: 2
20:54:22.086: audio type: Capture
Unfortunately, I'm not personally familiar with the AVerMedia cards at all, other than just watching comparison videos on youtube. However, if there's no way to change from h264 compression, that means that either something is going on with the card itself where it can't encode fast enough (which could be an issue if it's overheating), or something is going on the decoding end, where your computer isn't able to process the h264 data fast enough and decode the original image it's trying to send.
Or, it could be something I know nothing about with AVerMedia's software, which could be acting as an intermediary. I don't know anything about this unfortunately, so I can't even comment on the reason why you would have the C835
and the LGPLite Stream Engine options shown.[/quote]