Convert video to h265 with Intel UHD graphics on ffmpeg:
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You can use hardware acceleration with Intel UHD integrated graphics with the ffmpeg file converter on Linux.
You will need the vaapi (Intel graphics) drivers installed on your Linux distro before hand.
You will also need to know the graphics card location in your /dev/dri/ folder.
The default is /dev/dri/renderD128 which Includes my Dell Latatude 5300 laptop on KDE Neon 5.21. You can search with "ls /dev/dri/" command.


Command:
ffmpeg -hwaccel vaapi -hwaccel_output_format vaapi -hwaccel_device /dev/dri/renderD128  -i "old.mkv" -acodec flac -compression_level 8 -ac 2 -c:v hevc_vaapi  "new.mkv"

Under the -acodec flag, it is what I had in another note to convert audio to flac lossless audio, max compression without loss, and down mix to stereo. the -c:v flag (synonym for -vcodec). is to use hardware accelerated h264 (HEVC) codeic for Intel drivers/GPU.

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Sources:
https://stackoverflow.com/questions/5678695/ffmpeg-usage-to-encode-a-video-to-h264-codec-format
https://trac.ffmpeg.org/wiki/HWAccelIntro
https://trac.ffmpeg.org/wiki/Hardware/VAAPI

Date: June 2nd, 2021.