Doom9's Forum - Fun with Video Scopes

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- - Fun with Video Scopes (https://forum.doom9.org/showthread.php?t=72634)

Fun with Video Scopes

Hi,

I've had trouble knowing what to do with many of the lovely filters that are available. So, I made a vdub plugin that shows a bunch of charts of the video so I can measure/see the effect of filters like levels. I've included histograms, a waveform monitor, a vectorscope, and a scanner for 'non legal' composite signals.

I just reworked the thing so it could be called from avisynth. So, I thought I'd post here. It of course only works in RGB, but it's for seeing, not changing, so colorspace conversions should not be a big issue.

The plugin is here. Below is an avs usage function.

Code:

# Arguments:

#   mode:  0=Histograms, 1=Show Hot Pixels, 2=Video Channels, 

#          3=Waveform Monitor, 4=Vectorscope

#

#   (input Characteristic args mainly used for luma calcs)

#   NTSC vs PAL

#   stdDef (601) vs hiDef (709)

#   rng255 vs rng219 (Pick rng255=false if you want luma black=0)

#

#   (show channels used in modes 0,2,3)

#   luma,red,green,blue

#

#   hotFixMode: 0=turn hot pixels black, 1=lower intensity, 2=lower saturation

#   showWFMgrid: turn it off to see better.





function VD_clrtools(clip clip, int "mode",

                        \ bool "NTSC", bool "stdDef", bool "rng255",

                        \ bool "luma", bool "red", bool "green", bool "blue",

                        \ int "hotFixMode", bool "showWFMgrid")

{

  LoadVirtualdubPlugin(VirtualDub_plugin_directory+"\clrtools.vdf", "_VD_clrtools")



  return clip._VD_clrtools(default(mode,0),0,0,

                        \ default(NTSC,true)?1:0,0, 

                        \ default(stdDef,true)?1:0, 

                        \ default(rng255,true)?1:0, 

                        \ default(luma,true)?1:0, 

                        \ default(red,true)?1:0, 

                        \ default(green,true)?1:0, 

                        \ default(blue,true)?1:0, 

                        \ default(hotFixMode,0), 

                        \ default(showWFMgrid,true)?1:0)

}





#Example Usage:



avisource("my.avi", pixel_type="RGB32")



#Luma Histogram Only

VD_clrtools(mode=0,red=false,green=false,blue=false) 



#Luma Waveform Monitor

#VD_clrtools(mode=3,red=false,green=false,blue=false) 



#Vectorscope

#VD_clrtools(mode=4)

Many thanks for your plug-in and hard work.

richard
photorecall.net

:cool: :cool: :cool: :cool: :cool: :cool: :cool:

the link doesn't want to work...can anybody supply a mirror?

Try this one:

http://www.trevlac.us/colorCorrection/clrtools.vdf

(it's the www that makes the difference)

[edit] Spoke to soon!! Hey trev, your domain is gone!!

Is there a way to use this filter in a capture preview mode (possibly in vdub)?

I'd like to fine tune my analog capture setup (i.e. adjust color/brightness/etc) before capturing.

Thanks

This receipe is straight from trevlac. Make sure you use a recent ffdshow build and the latest colortools version.

Quote:

For Live DV feed Very Happy But should work for other sources.

Using
- VirtualVCR
- ffdshow
- my vdub scope
- avisynth script

1) Set ffdshow to decode DV as said in this thread

http://forum.doom9.org/showthread.ph...ght=ffdshow+dv

2) Make avisynth script to use colortools as said here

http://forum.doom9.org/showthread.ph...scope+avisynth

3) Change sample script to not use avisource and add a converttorgb32() at start, and a flipvertical() at end.

4) Startup vvcr capture preview (or another directshow cap app)

5) Check avisynth config setting in ffdshow decoder and load the script

Since my device is not DV, I used graphedit and attached the fddshow filter to the preview pin of the capture device.

It was a while back when I did this, so the details are a bit fuzzy by now. Prototyping in graphedit gives you a better grip on which conversions are happening along the chain.