How to encode video from raw RGB (grayscale) to Xvid (color)

[Fixer]

Hello
How to convert this video:

MediaInfo

General
Complete name : test.avi
Format : AVI
Format/Info : Audio Video Interleave
Format profile : OpenDML
File size : 2.41 GiB
Duration : 49s 640ms
Overall bit rate : 416 Mbps

Video
ID : 0
Format : RGB
Codec ID : 0x00000000
Codec ID/Info : Basic Windows bitmap format. 1, 4 and 8 bpp versions are palettised. 16, 24 and 32bpp contain raw RGB samples
Duration : 49s 640ms
Bit rate : 416 Mbps
Width : 1 924 pixels
Height : 1 082 pixels
Display aspect ratio : 16:9
Frame rate : 25.000 fps
Bit depth : 8 bits
Bits/(Pixel*Frame) : 8.000
Stream size : 2.41 GiB (100%)

into this

Format settings, Matrix : Default (H.263)
Codec ID : XVID
Codec ID/Hint : XviD
Duration : 4s 760ms
Bit rate : 13.1 Mbps
Width : 1 924 pixels
Height : 1 082 pixels
Display aspect ratio : 16:9
Frame rate : 25.000 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive

I use:
VirtualDub 1.10.0 build: 33848
ffdshow beta7 rev3154 20091209

Why I still have grayscale video?

[jagabo]

You can't make color from grayscale. In a grayscale image all the color information has been removed.

[Fixer]

I need to use debayering method...

[jagabo]

Then use a debayering or demosaicing filter:

https://forum.videohelp.com/threads/331647-YUY2-vs-RGB24-vs-Y800?highlight=debayering

That thread links to one for VirtualDub.

https://forum.videohelp.com/threads/331647-YUY2-vs-RGB24-vs-Y800?p=2057308#post2057308

[Fixer]

Debayering Filter v1.0 plugin crash VirtualDub
It works only to 1280x720px
how to resize from 1 924 to 1 920 without crash?

[jagabo]

Debayering Filter v1.0 plugin crash VirtualDub
It works only to 1280x720px

I didn't realize that.

how to resize from 1 924 to 1 920 without crash?

I would use the crop filter before debayering. Crop to 1/4 the size and debayer. Do the same for all four quadrants. Then you can paste the four pieces together in a paint program.

Or try using the AviSynth debayering filters.

[Fixer]

Now I try AviSynth debayering filter

1. download filter: http://moodub.free.fr/video/Avisynth_DebayerFilter.zip

2. unzip to: C:\Program Files\AviSynth 2.5\plugins\

3. make file.avs

4. paste this script

LoadPlugin("C:\Program Files\AviSynth 2.5\plugins\rawsource.dll")
LoadPlugin("C:\Program Files\AviSynth 2.5\plugins\DebayerFilter.dll")
DirectShowSource("Z:\test.avi")
Crop(0,0,-4,-2)
ConvertToYV12()
FlipVertical()
FlipHorizontal()
DebayerFilter(swap=0)
FlipHorizontal()
LanczosResize(1280,720)

5. open file.avs into VirtualDub

6. save as avi...

7. done

[jagabo]

Could you post a short sample of your source video?

Did you try cropping the source before using the VirtualDub Debayering filter? Did you get proper colors results in the output pane?

[Fixer]

1. no, in zip archive (http://www.infognition.com/VirtualDubFilters/mirror/debayering.zip) you have sample movie "Test.avi"

2. yes I try this with no positive results VirtualDub just crash when you try crop movie in RAW RGB mode
probably I have wrong offset 1924, VD suspect 1920
but you can use a litle "hack" to crop RAW RGB without crash VD
a) open file.avs
b) paste script:

LoadPlugin("C:\Program Files\AviSynth 2.5\plugins\rawsource.dll")
LoadPlugin("C:\Program Files\AviSynth 2.5\plugins\DebayerFilter.dll")
DirectShowSource("Z:\test.avi")
Crop(0,0,-4,-2)

c) now you can use filter cal: "null transorm" and crop (or trim timeline) movie
d) save as... it works for me
e) now we have nice RAW RGB movie + crop, without debayering filter

3. yes, after debayering filter I have proper colors

[jagabo]

I took that sample video and mosaiced it into a 2160x1152 frame:

AviSource("Test.avi", audio=false)
StackHorizontal(last,last,last)
StackVertical(last,last)

The debayering filter in VirtualDub had no problems with it. It looks like the debayering filter requires mod 16 frame sizes. Crop or pad your source video to suit. I cropped a 1924x1080 video down to 1920x1072 with VirtualDub's crop feature then used the debayering filter -- it worked fine.

If you're going to use AviSynth to crop you might as well use one of the debayering filters for AviSynth.

import("C:\Program Files (x86)\AviSynth 2.5\plugins\Demosaic.avs")
AviSource("Test.avi", audio=false)
StackHorizontal(last,last,last)
StackVertical(last,last)
Demosaic(xoffset=2,yoffset=2)

[Fixer]

big thx for help, on weekend i will be test your advice.