FFmpeg tips

ffmpeg_tips.txt

# Convert HLS .m3u8 playlist to MP4
ffmpeg -i playlist.m3u8 -acodec copy -vcodec copy output.mp4
# for stream with AAC audio also needs to add the bitstream filter https://ffmpeg.org/ffmpeg-bitstream-filters.html#aac_005fadtstoasc
ffmpeg -i playlist.m3u8 -acodec copy -bsf:a aac_adtstoasc -vcodec copy output.mp4

# lossless cut from URL. -ss input seeking point, -t duration
ffmpeg -ss 00:00:00 -i <URL> -t 00:00:00 -acodec copy -vcodec copy output.mp4
# get URL with youtube-dl. -to output seeing point
ffmpeg -ss 00:00:00 -i `youtube-dl -g <URL>` -t 00:00:00 -acodec copy -bsf:a aac_adtstoasc -vcodec copy -copyts -avoid_negative_ts 1 output.mp4

# create GIF using palette method https://superuser.com/a/1255109
ffmpeg -y -ss 0 -t 0.3 -i file.mp4 -filter_complex \
"fps=10,scale=320:-1:flags=lanczos[x];[x]split[x1][x2]; \
[x1]palettegen[p];[x2][p]paletteuse" output.gif

# merge video files
ffmpeg -safe 0 -f concat -i <(find . -type f -name '*' -printf "file '$PWD/%p'\n" | sort) -c copy output.mkv

# Extract audio stream
ffmpeg -i input.mkv -map 0:a:1 -c:a copy output.wav