What are /r/Galaxy_S21's favorite Products & Services?

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You've probably come across this: https://support.google.com/youtube/answer/7126552#zippy=%2Cupload-requirements which leads to https://mkvtoolnix.download/doc/mkvmerge.html

The command to run from Windows cmd looks like this: >mkvmerge.exe input_video_s21_HDR10_plus.mp4 --colour-matrix -1:9 --colour-transfer-characteristics -1:16 --colour-primaries -1:9 -o out.mp4

That should encode the correct HDR Metadata.

The S21 appears to use H.265 encoding for HDR10+ video while youtube requires H.264 So the final step (or might need to do it as a first step?) is to convert from H.265 to H.264. I used "Handbrake.fr" tool for this task, but I suppose there are many others. Be sure to select the H.264 output format and that it is 10bit

Then upload the video to youtube.

I bought a couple of these for the S20, and they work excellent on my S21u. Out of stock, but anything like this should work fine.