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X265 delivers superior quality and offers much better compression than X264
However, X265 only works with newer TV sets. I have a Samsung Series 8 60 inch F8000 LED TV, only 5 years old. There is a command on the Ask Ubuntu Forum that illustrates how to transcode X265 MKV to X264 MP4 using ffmpeg. I have it modified slightly and saved it as an executable script, as below:
#!/bin/bash
# transcode all x256 .mkv to X264 .mp4 with ffmeg
for i in *.mkv ; do
ffmpeg -i "$i" -bsf:v h264_mp4toannexb -sn -map 0:0 -map 0:1 -vcodec libx264 "$i.ts"
mv "$i.ts" "$i.mp4"
sleep 3
done
To use it, I "cd" to the folder that contains the X265 data and call the script ...
The item on the Ask Ubuntu forum also contains details of the ffmpeg options in the above command.