First off, my conclusion: Don't bother with HDMI recording. Too much hassle, no real payoff, plus it's almost impossible to gauge which side of the video looks better with KZitem's compression ruining the detail, so links below for some raw samples. Watch in 1440p if you can.
The Hauppauge HD PVR Rocket recording quality is fractionally lower than the Shark Byte DVR, take a look at this blown up comparison still from the recordings used to make this video, each pixel has been enlarged 5x, note how the HDMI recording failed to get the detail of the wires in the sky.
www.haku.co.uk/...
If you want to externally record 16:9 you need to set the VRX's HDMI output to 16:9, meaning if you have 4:3 goggles like I do, the picture will be squashed, making it more difficult to fly (I'm surprised I didn't smash into anything when turning left or right because of how the squashed image skews sideways).
To record the HDMI output of the VRX I connected a Hauppauge HD PVR Rocket to it, which was in turn plugged into my goggles so I could see the live feed. The PVR didn't add latency.
On top of the inconvenience of extra hardware & extra cables dangling from your goggles, you don't want the HDMI recorder to lose power because that means you can't see.
I flew a Diatone Tina Whoop with Shark Byte & the RunCam Nano HD camera.
To get the two recordings perfectly aligned I had to delete some individual frames from the HDMI recording, 12 to be exact, it appears the Shark Byte DVR has a fault; it skips a single frame every 1000 frames.
Here are 1 minute raw sample recordings from this video, they have not been re-encoded but the audio has been stripped (there was nothing to listen to anyway):
Shark Byte DVR 154MB file: www.haku.co.uk/...
HDMI capture 99.9MB file: www.haku.co.uk/...
I had to put them in zip files, stupid webhost wouldn't serve the Shark Byte .TS as a binary, and clicking on the HDMI .mp4 sample made it play in the browser, you need to view it with a proper video player on your computer.
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