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FFmpeg

Resize video

Base command: ffmpeg -i <input> <output>

Intermediary options:

-vcodec libx265|libx264
-crf <value> reasonable range for h265 is 24 to 30, 34 still looks like something
-b <number>k bitrate (per second)
-fs <number> file size limit
-vf "scale=trunc(iw/4)*2:trunc(ih/4)*2" filter to scale by half
-vf scale=1280:720 filter to scale to 720p