My newer laptop is in the shop. That's fine because its super awesome warranty expires in January. So getting some last minute touch ups and problems fixed. However, that relegates me to my old faithful, Alienware M14.

Here's the happy fun times stuff: that model uses the Nvidia GT 750M video adapter. That chip has been deprecated in the newest version of the Nvidia drivers, and thus OBS as well. With modern OBS I can no longer use my GPU on this laptop for compressing RTMP streams. (Never trust asshats in the comments who say "just update your drivers....")

After a LOT of time trying to figure this out, I finally came to this as a solution. Since I'm using Windows 10 on this laptop, I had to install the Nvidia 425.31 drivers. AFAIK, that's the last driver set to support the Kepler chip in the GT 750M. I also had to download FFMPEG 4 shared build zip from the Gyan archives. From there, I replaced the DLLs from the ffmpeg build to the OBS 64bit folder. Now OBS 27 is willing to place nice with my old GPU.

Just posting this here for reference.