Chapter 2.28 uses filter_complex without white spaces or colons? $ ffmpeg -i 20220421_163910-meet.mp4 -i image_with_clut-meet-edited-clut.png -filter_complex [0]eq=brightness=0.06[a];[a][1]haldclut -y 20220421_163910-meet-edited.mp4
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '20220421_163910-meet.mp4':
...
Filter eq has an unconnected output
bash: [a][1]haldclut: command not found
Notice, "haldclut command not found"
Including white space for filter_complex:
$ ffmpeg -i 20220421_163910-meet.mp4 -i image_with_clut-meet-edited-clut.png
-filter_complex '[0]eq=brightness=0.06 [a];[a] [1] haldclut' -y 20220421_1
63910-meet-edited.mp4
man ffmpeg-filters
Looks like you syntax omits the single quotes around the filter_complex option
AND has missing white spaces and/or colons.
Not sure if "[a];[a]" should have white spaces.
For sake of simplicity, here's what I have:
/* OWN MODIFIED LUT OR WHITE BALANCE FILTER */
Snip or extract portion of video requiring white balance, color or brightness
corrections.
$ ffmpeg -ss 590 -i 20220421_163910.mp4 -t 867 -codec copy
20220421_163910-meet.mp4
Frame of (VHS) video requiring white balance or color/brightness correction,
creating a CLUT embedded extracted image:
This is frame at "11:00" for this specific video
$ ffmpeg -ss 11:00 -i 20220421_163910.mp4 -f lavfi -i haldclutsrc=8
-filter_complex
"[1]format=pix_fmts=rgb48be[a];[a][0]xstack=inputs=2:layout=0_0|w0_0" -frames 1
-y image_with_clut-meet.png
Open image_with_clut-meet.png within Gimp, edit Color > Color Temperature
and/or Color > Levels > Output Levels, export as "16bpc RGB"
image_with_clut-meet-edited.png.
Crop the CLUT (512:512) from the Gimp exported image.
$ ffmpeg -i image_with_clut-meet-edited.png -vf crop=512:512:0:0 -y
image_with_clut-meet-edited-clut.png
Apply the resulting CLUT using FFmpeg's filter_complex.
TIP: Use acodec copy as this is only modifying the video stream.
TODO: Brightness reduction for color retention?
TODO: Added white space to filter_complex, likely could also use colons, but
white spacing is better for readability.
$ ffmpeg -i 20220421_163910-meet.mp4 -i image_with_clut-meet-edited-clut.png
-filter_complex '[0]eq=brightness=0.06 [a];[a] [1] haldclut' -y
20220421_163910-meet-edited.mp4
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