video-audio encode

# ENCODE
# AUDIO
# upmix stereo to 5.1
ffmpeg -i sound.opus -filter_complex "[0:a]pan=5.1(side)|FL=FL|FR=FR|LFE<FL+FR|FC<0.5*FR+0.5*FL|SL=FL|SR=FR[a]" -map 0 -map -0:a -map "[a]" -c copy -c:a flac output.flac

# convert any audio in current dir to mp3 in parallel
ls -1 --file-type | parallel --max-args 1 ffmpeg -i "{}" -vn -ar 44100 -ac 2 -b:a 192k "/path/{.}.mp3"

# VIDEO
# 4k h264/5, practical, small, ok
handbrakecli -d veryslow -e x264 -q 28 -i sourcevid -o outputvid.mp4
handbrakecli -d veryslow -e x265 -q 28 -i sourcevid -o outputvid.mp4

# 4k h264, fast, small, bad
handbrakecli -d ultrafast -e x264 -q 38 --width 1280 --height 720 -i inputvid -o outputvid.mp4

# 4k archiv, unpractical, large, lossless
x265 --preset veryslow --lossless --input-res 3840x2178 --fps 30000/1001 --output x265vid.mp4 inputvid

# 4k to 1080p, h264, fast, bad quality
ffmpeg -i inputvid -c:v h264 -preset veryslow -crf 28 -vf scale=1920:-1 -max_muxing_queue_size 1024 -c:a copy -c:s copy output.mkv

#4k to 1080p, h264, slow, good quality, all audio and sub tracks
ffmpeg -threads $[$(nproc)-1] -thread_queue_size 512 -i inputvid $(echo '-map 0:'{0..99}'?') -c:v h264 -vf scale=1920:-1 -preset veryslow -tune film -crf 22 -max_muxing_queue_size 4096 -c:a copy -c:s copy output.mkv

# CUTTING
# cut away beginning and end
ffmpeg -ss 00:00:02 -i longer.mkv -codec copy -t 00:22:20 shorter.mkv

# cut from ss to end
ffmpeg -i longer.mkv -ss 00:00:02 -c copy -t 99:99:99 shorter.mkv

# replace video in mkv (BASH only)
# map from second video (stream 0, the video) (1:0)
# map all other streams from first video exept the first stream (¬0:0 but 0:1..99) if they exist ('?')
eval "$(echo ffmpeg -i videotoreplace.mkv -i newvideo.av1 -map 1:0 '-map '0:{1..99}'?' -c copy outputwithnewvideo.mkv)"

# concatenate ts video files including all streams - might not copy subs
ffmpeg -i "concat:00000.m2ts|00001.m2ts|00002.m2ts" -c copy -map 0 output.ts

# concatenate MKV
echo "file '/path/part1.mkv'" >  list.txt
echo "file '/path/part2.mkv'" >> list.txt
# safe for absolute paths
# concat for concatenation
# list.txt has list of files
# c:a copy all audio files
# c:s copy all subs
# vcodec copy video
# map 0 as std option to copy everything
ffmpeg -safe 0 -f concat -i list.txt -c:a copy -c:s copy -vcodec copy -map 0 output.mkv

# gource h265 encode
gource -a 1 -i 0 -s 1 -c 1.5 -r 60 --title TITLE --key --date-format "%Y-%m-%d %H:%M" --highlight-users -1920x1080 -o - |\
ffmpeg -y -r 60 -f image2pipe -vcodec ppm -i - -vcodec libx265 -preset slow -pix_fmt yuv420p -crf 22 -bf 0 gource.mp4

# HANDBRAKE
# 90° right math handbrake
--rotate=angle=0:hflip=0