ffmpeg convert to another format eg h265 to h264
Change $file to the file you wanta to convert and $file-h264 is the name of the converted file.
ffmpeg -i $file -c:v libx264 -profile:v high -preset slow -tune -film -crf 18 $file-h264.mp4
Of course you can adapter the -c:v libx264 to any other format you might want.
Here is a handy script to mass convert to h264:
for file in `ls *.mp4`; do
echo ffmpeg -i $file -c:v libx264 -profile:v high -preset slow -tune -fil........