Is it possible to "remove" everything in a video except a specific color
(or maybe a range... ie close to a specific color)?
By "remove" I mean covert every that is NOT the color(s) I want to black
or transparent.
I have a video that contains a yellowish box that moves about the screen.
I want to isolate ONLY the yellowish box. Everything else should become
black or transparent. The specific color is "fbed54" according to the
color picker in Gimp.
FYI. My knowledge of "colors" in general is extremely limited... let's put
it this way, I'm pretty sure RGB stands for Red Green Blue... that's about
the extent of it. So, a specific example would be very helpful.
$ ffmpeg -i sample.mkv
ffmpeg version N-96974-g425b6a9a2c Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 9 (GCC)
configuration: --enable-gpl --enable-version3 --enable-nonfree
--enable-static --disable-shared --disable-debug --enable-libass
--enable-libfdk-aac --enable-libfontconfig --enable-libfreetype
--enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis
--enable-libvpx --enable-libx264 --enable-libx265 --enable-openssl
--enable-libbluray --enable-libcdio
libavutil 56. 42.100 / 56. 42.100
libavcodec 58. 75.100 / 58. 75.100
libavformat 58. 41.100 / 58. 41.100
libavdevice 58. 9.103 / 58. 9.103
libavfilter 7. 77.100 / 7. 77.100
libswscale 5. 6.101 / 5. 6.101
libswresample 3. 6.100 / 3. 6.100
libpostproc 55. 6.100 / 55. 6.100
Input #0, matroska,webm, from 'sample.mkv':
Metadata:
ENCODER : Lavf58.29.100
Duration: 00:01:28.33, start: -0.051000, bitrate: 3242 kb/s
Stream #0:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 1600x900
[SAR 1:1 DAR 16:9], 30.30 fps, 30.30 tbr, 1k tbn, 60 tbc (default)
Metadata:
DURATION : 00:01:28.333000000
Stream #0:1: Audio: vorbis, 48000 Hz, stereo, fltp (default)
Metadata:
DURATION : 00:01:28.249000000
At least one output file must be specified
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