I do not want to use ShadowPlay, as I am using OBS for recordings longer than 1hr and sometimes more.
I wasn't suggesting you use ShadowPlay, I was saying AMD also has an encoder that uses the hardware in the GPU, which is accessible solely in the AMD software without a 3rd party tool, like ShadowPlay is. OBS supports that method if you choose the encoder that makes it work that way (AMF/VCE), however I've read some recent reports of it not being as well supported by AMD as Nvidia does NVENC. You should still try it if you haven't though.
I used AMD's first version of their built-in capture tool Re-Live, but it was pretty buggy back then. I've read that it's vastly improved since then though, and some even prefer it to ShadowPlay. It will depend whether you stream your content though. Most say streaming works best with OBS, but you have to be careful of stream settings, mainly output resolution, and bitrate, the latter of which requires good upload speed to use the recommended 5000 or 6000 for good quality.
The takeaway for me is, if you want best capture performance using an AMD GPU, the latest version of ReLive, using the latest beta GPU driver, is worth a shot. You may or may not experience the glitches he showed in the video, especially since your GPU is a much newer model, but as he demonstrated, they are easily bypassed anyway. I recall even way back when ReLive first launched, their sidebar was always buggy and best avoided.
The horrible software support was mainly what drove me away from AMD and toward Nvidia a few years ago. Sure, there are now and then problems with Nvidia drivers and ShadowPlay as well, but they don't happen nearly as often, are usually much smaller, and fixed much quicker. At worst you can roll back a driver or GeForce Experince version or two, as a temp workaround. With Adrenaline and ReLive, you're often stuck waiting for them to fix the problem, which can take a while. It literally took 7 MONTHS for them to finally fix the 5000 series GPU driver problems. Sure, AMD always offer great bang for buck on their hardware, but you definitely end up getting what you pay for.