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With many devices can build a capture graph in GraphStudio then open that graph with AviSynth's AviSource() or DirectShowSource(). Then you can use AviSynth's Histogram() function to get live feedback while you adjust the proc amp. The exact graph varies from device to device. Search through these forums look for examples. I've been playing with a US$6 HDMI capture device that emulates a webcam. Here's an example using that:
[Attachment 57964 - Click to enlarge]
In that image you can see the simple GraphEdit graph (most capture devices will need a more complex graph) that's used both for capturing and for adjusting the proc amp. The AVS script looks like:
DirectShowSource("cap.grf", audio=false, framecount=100000) BilinearResize(width/2, height/2) # just make it smaller for this test TurnRight().Histogram().TurnLeft() # horizontal waveform monitor at the top of the frame ConvertToRGB(matrix="rec709") # the device is putting out rec.709
Here's a thread with some more complex graphs:
Those aren't for AviSynth monitoring but they may give you ideas about kind of filters you need to string together. Leave a video (and audio?) output pin open for AviSynth.
Last edited by jagabo; 24th Mar 2021 at 06:52.
Thanks Jagabo, I'll check that thread out.