gorillamoe/ffmpeg-m3u8-to-mp4-conversion.md

Created October 7, 2020 11:46

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HLS .m3u8 to .mp4 using ffmpeg

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ffmpeg-m3u8-to-mp4-conversion.md

ffmpeg -i "http://host/folder/file.m3u8" -bsf:a aac_adtstoasc -vcodec copy -c copy -crf 50 file.mp4

-bsf:a aac_adtstoasc

bsf = (bit stream filter)
use aac_adtstoasc bsf for a audio streams, this is need if .m3u8 file consists with .ts files and output is .mp4
reference https://ffmpeg.org/ffmpeg-bitstream-filters.html#aac_005fadtstoasc

-c copy -vcodec copy

skip codec (encode and decode), just demux and mux
I guess .ts and .mp4, for video stream, they are both H.264 codec, just guess.
reference https://ffmpeg.org/ffmpeg.html#Stream-copy

-crf 50

the example shows -c:a copy did not re-encode, guess this option is not needed here
And 0 is lossless, 23 is the default, and 51 is worst quality possible
reference https://trac.ffmpeg.org/wiki/Encode/H.264#CRFExample

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