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Judge based on the quality rather than the bitrate value. Use CRF mode encoding and if the quality isn't what you can accept, decrease the CRF value. ffmpeg -i "%%a" -s 3840x2610 -c:v libx264 -crf 18 -acodec copy D:\%%~na.mp4


The Apple video uses a profile with fewer reference frames and also carries a streaming hint track. The following ffmpeg command template should create a quick seeking MP4 file: ffmpeg -i input -c:v libx264 -profile:v baseline -x264opts keyint=3:min-keyint=2 -{other video encoding parameters} -{audio encoding parameters} -movflags +faststart+rtphint ...

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