FFmpeg is a free and open-source project consisting of a vast software suite of libraries and programs for handling video, audio, and other multimedia files and streams. It can be used to record, convert and stream audio and video.
Usage for Online Video Stream
ffmpeg -i "URL_FOR_m3u8_FILE" -bsf:a aac_adtstoasc -vcodec copy -c copy -crf 50 LOCAL_FILENAME.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), for demuxing and muxing for video stream, using H.264 codec. reference https://ffmpeg.org/ffmpeg.html#Stream-copy -crf 50 0 is lossless, 23 is the default, and 51 is worst quality reference https://trac.ffmpeg.org/wiki/Encode/H.264#CRFExample
This is just a note for myself. If you want to know more about this tool, search it on its official website. I bet you will like it.
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