1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
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
## Fix Loudness war, bring bass back
-af "equalizer=f=200:w=200:t=h:g=-9,equalizer=f=400:w=600:t=h:g=-9,equalizer=f=2000:w=2000:t=h:g=-12,equalizer=f=4000:w=4000:t=h:g=-12,equalizer=f=10000:w=10000:t=h:g=-12,volume=+0.0dB"
## Audio trim
HINT: Repeat afade twice for log.
-af "afade=t=in:d=500ms,afade=t=out:st=183427ms:d=500ms" \
## 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-$(date +%Y%m%d-%H%M%S).mp4"
## Trim video
-i INFILE -ss <pos> -t <dur> OUTFILE
-i INFILE -ss <pos> -to <pos> OUTFILE
## Concatenate
&& ffmpeg -i one.mkv -i two.mkv \
-filter_complex '[0:v] [0:a] [1:v] [1:a] concat=n=2:v=1:a=1 [v] [a]' \
-map "[v]" -map "[a]" out.mkv \
## Rotate Portrait
-i INFILE -vf "transpose=2" OUTFILE
## Video to Gif
HINT: Use same filter for palette as for conversion.
FILTERV=fps=6,scale=-1:600
FILTERV=fps=6,scale=-1:480
INPUTV=input.mp4
Create custom palette:
-i "${INPUTV:?}" -vf "${FILTERV:?},palettegen=stats_mode=diff" palette.png
Use this palette:
-i "$INPUTV" -i palette.png -filter_complex "[0:v]${FILTERV:?}[vid];[vid][1:v]paletteuse=dither=bayer:bayer_scale=5:diff_mode=rectangle" dst.gif
Working example from web (but not optimized):
ffmpeg -ss 0 -t 2.5 -i INPUT.mp4 -filter_complex "[0:v] fps=12,scale=-1:600,split [a][b];[a] palettegen=stats_mode=diff [p];[b][p] paletteuse=new=1" OUTPUT.gif
## Pictures to Video (eg Timelapse)
-start_number 5619 -framerate 24 -i "input/IMG_%d.JPG" \
-vf "scale=4096:-1,crop=4096:2160:0:0" \
out.mkv
## Create GIF by image series
&& TMPVID="tmp.mkv" \
&& PALETTE_PNG="palette.png" \
&& FPS="5" \
&& FILTERV="fps=${FPS:?}" \
&& ffmpeg -start_number 0 -framerate "${FPS:?}" -i "src%d.png" "${TMPVID:?}" \
&& ffmpeg -i "${TMPVID:?}" -vf "${FILTERV:?},palettegen=stats_mode=diff" "${PALETTE_PNG:?}" \
&& ffmpeg -i "${TMPVID:?}" -i "${PALETTE_PNG:?}" -filter_complex "[0:v]${FILTERV:?}[vid];[vid][1:v]paletteuse=dither=bayer:bayer_scale=5:diff_mode=rectangle" dst.gif \
&& rm "${TMPVID:?}" "${PALETTE_PNG:?}" \
|
