H.264 Level for 1920x1080 60p video
According H.264 specifications, 1920x1080 60p video should use Level 4.2 (2,048×1,080@60).
However some old hardware players (e.g. Popcorn Hour A-210) can play 1920x1080 60p videos created only with Level 4.1.
By default, ffmpeg/libx264 automatically sets Level 4.2 for a created 1920x1080 60p videos.
Should I manually change Level to 4.1 for such video for better compatibility?
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