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artkirienko/encode-mp4.txt

Created December 8, 2017 21:15
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ffmpeg video compression / specifc file size
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encode-mp4.txt
(38.5 MiB * 8192 [converts MiB to kBit]) / 260 seconds = ~1213 kBit/s total bitrate
1213 - 96 kBit/s (desired audio bitrate) = 1117 kBit/s video bitrate
38.5 * 8192.0 / (4 * 60 + 20) - 96 = 1117
ffmpeg -y -i input.mp4 -c:v libx264 -preset medium -movflags faststart -b:v 1117k -pass 1 -an -f mp4 /dev/null && \
ffmpeg -i input.mp4 -c:v libx264 -preset medium -movflags faststart -b:v 1117k -pass 2 -b:a 96k output.mp4
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artkirienko commented Feb 15, 2018 •
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5.1 to stereo
-ac 2

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-map_chapters -1
-map_metadata -1

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artkirienko commented Feb 15, 2018 •
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ffmpeg -ss 01:42:50.0 -i abc.mkv -ss 00:00:59.0 -t 00:04:00 -map 0:v:0 -map 0:a:2 -b:v 800k -tune film -preset veryslow -movflags +faststart -ac 2 -b:a 128k -map_metadata -1 -map_chapters -1 tmbu03en_4.mp4

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find . -name '*.webm' -exec NAME={}; ffmpeg -i "${NAME/\.\//}" -preset veryslow -tune film -movflags +faststart -map_metadata -1 "${NAME/\.\//}.mp4"; pwd ";"

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artkirienko commented Jun 15, 2021 •
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docker run -v $(pwd):$(pwd) -w $(pwd) jrottenberg/ffmpeg -i before.webm -tune animation -movflags +faststart -map_metadata -1 after.mp4

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