I'm trying and failing to get the pseudocolour filter to work. I think my
issue is more to do with not knowing how to formulate the filter syntax in
general. I basically just copy pasted the example from the filter
documentation and I am guessing that I should be populating the
amax/ymax/val values with actual numbers?
If so, I'm not sure what to populate val and amax with. Things like ymin
and ymax seem like they should be 235 and 255 for 8-bit, but I'm clueless
about the others.
Or perhaps I should be populating the values using signalstats in some way?
Anyhow here's what I tried.
./ffmpeg -i 5fr_out_of_brang.mkv -vf
pseudocolor="if(between(val,ymax,amax),lerp(ymin,ymax,(val-ymax)/(amax-ymax)),-1):if(between(val,ymax,amax),lerp(umax,umin,(val-ymax)/(amax-ymax)),-1):if(between(val,ymax,amax),lerp(vmin,vmax,(val-ymax)/(amax-ymax)),-1):-1"
-c:v ffv1 pseudo.mkv
ffmpeg version N-87068-g8a0954d Copyright (c) 2000-2017 the FFmpeg
developers
built with gcc 5.3.0 (Homebrew gcc 5.3.0)
configuration:
libavutil 55. 74.100 / 55. 74.100
libavcodec 57.103.100 / 57.103.100
libavformat 57. 77.100 / 57. 77.100
libavdevice 57. 7.101 / 57. 7.101
libavfilter 6.100.100 / 6.100.100
libswscale 4. 7.103 / 4. 7.103
libswresample 2. 8.100 / 2. 8.100
Guessed Channel Layout for Input Stream #0.1 : 4.0
Input #0, matroska,webm, from '5fr_out_of_brang.mkv':
Metadata:
ENCODER : Lavf57.76.100
Duration: 00:00:00.20, start: 0.000000, bitrate: 138359 kb/s
Stream #0:0(eng): Video: ffv1 (FFV1 / 0x31564646), yuv422p10le(top
coded first (swapped)), 720x576, SAR 16:15 DAR 4:3, 25 fps, 25 tbr, 1k tbn,
1k tbc (default)
Metadata:
HANDLER_NAME : Apple Alias Data Handler
TIMECODE : 06:00:05:01
ENCODER : Lavc57.75.100 ffv1
DURATION : 00:00:00.200000000
Stream #0:1(eng): Audio: pcm_s24le, 48000 Hz, 4.0, s32 (24 bit), 4608
kb/s (default)
Metadata:
HANDLER_NAME : Apple Alias Data Handler
DURATION : 00:00:00.168000000
File 'pseudo.mkv' already exists. Overwrite ? [y/N] y
Stream mapping:
Stream #0:0 -> #0:0 (ffv1 (native) -> ffv1 (native))
Stream #0:1 -> #0:1 (pcm_s24le (native) -> ac3 (native))
Press [q] to stop, [?] for help
[AVFilterGraph @ 0x3b0b460] No such filter: 'ymax'
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0
Conversion failed!
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