m3u8 files for each subtitle with such content: #EXTM3U m3u8 playlists for each audio (I use the same command as for video) ffmpeg -i file1.mp3 -profile:v baseline -level 3.0 -start_number 0 -hls_time 10 -hls_list_size 0 -f hls file1_320x280.m3u8įfmpeg -i file2.mp3 -profile:v baseline -level 3.0 -start_number 0 -hls_time 10 -hls_list_size 0 -f hls file2.m3u8įfmpeg -i file3.mp3 -profile:v baseline -level 3.0 -start_number 0 -hls_time 10 -hls_list_size 0 -f hls file3.m3u8 Changing this up to -crf 18 can result in a file size 2-5x smaller – but depending on content/viewing conditions may not be considered "visually lossless" (a subjective requirement – try different crf values with small samples beforehand by adding e.g.I am not a professional in this sphere, but here is how I handle it. -crf 10 value is low enough to look good (even with ultrafast preset), but will produce quite a large file.-c:v libx264 – use libx264 encoder for video tracks.-c:a copy will copy audio tracks instead of re-encoding.The ultrafast preset option for x264 will make it go as fast as it can: ffmpeg -i INPUT -c:a copy -c:v libx264 -crf 10 -preset ultrafast -s 1280x720 -pix_fmt yuv420p -map 0 OUTPUT
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