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ffmpeg
================
## Extract Audio From webm
Lookup format of audio stream with:
ffmpeg -i in.webm
Then use that knowlege to extract that (audio) stream:
ffmpeg -i in.webm -vn -acodec copy out.FORMAT_FROM_BEFORE
## Convert Formats
ffmpeg -i in.opus out.wav
## Fine-tune audio codec
[See also](https://slhck.info/video/2017/02/24/vbr-settings.html)
Use -codec:v copy to keep video, or -codec:v no for audio-only.
-codec:a aac -q:a 1.3 (min=0.1, good=1.3 max=2)
-codec:a aac -b:a 96k
-codec:a libmp3lame -q:a 2
-codec:a libopus
-filter:a lowpass=f=16000
## Record Desktop
ffmpeg -f gdigrab -framerate 6 -probesize 10M -offset_x 0 -offset_y 0 \
-video_size 1920x1200 -show_region 1 -i desktop -c:v h264_qsv \
-pix_fmt yuv420p "output-$(date +%Y%m%d-%H%M%S).mp4"
## Trim video
-i INFILE -ss <pos> -t <dur> OUTFILE
-i INFILE -ss <pos> -to <pos> OUTFILE
## Concatenate
&& ffmpeg -i one.mkv -i two.mkv \
-filter_complex '[0:v] [0:a] [1:v] [1:a] concat=n=2:v=1:a=1 [v] [a]' \
-map "[v]" -map "[a]" out.mkv \
## Rotate Portrait
-i INFILE -vf "transpose=2" OUTFILE
## Video to Gif
HINT: Use same filter for palette as for conversion.
FILTERV=fps=6,scale=-1:600
FILTERV=fps=6,scale=-1:480
INPUTV=input.mp4
Create custom palette:
ffmpeg -ss 4 -t 33 -i "$INPUTV" -vf "$FILTERV,palettegen=stats_mode=diff" palette.png
Use this palette:
ffmpeg -ss 4 -t 33 -i "$INPUTV" -i palette.png -filter_complex "[0:v]$FILTERV[vid];[vid][1:v]paletteuse=dither=bayer:bayer_scale=5:diff_mode=rectangle" output.gif
Working example from web (but not optimized):
ffmpeg -ss 0 -t 2.5 -i INPUT.mp4 -filter_complex "[0:v] fps=12,scale=-1:600,split [a][b];[a] palettegen=stats_mode=diff [p];[b][p] paletteuse=new=1" OUTPUT.gif
## Pictures to Video (eg Timelapse)
-start_number 5619 -framerate 24 -i "input/IMG_%d.JPG" \
-vf "scale=4096:-1,crop=4096:2160:0:0" \
out.mkv
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