Not all cameras output a 10bit signal through HDMI or HD-SDI (many are actually output 8bit even though the A/D signal processing upstream may be higher) While you can get gradients in live footage (like skies, shadows), it's easier to see with computer generated ramps, and you can more easily start with higher precision (like a 16 or 32bit RGB format). already quantized, so 8bit will look the same as 10bit). are less useful for this testing, because there are no gradients - they show discrete solid uniform colors (ie. How do you know it's a "valid" 10bit source? The answer is you don't know unless you have something like a gradient to look at. With some conversions I could finally get 10bit yuv, what a pain though. Update2: yep, povray can create 16bit linear rgb in PNG and PPM. If there's an output plugin for povray, that's pretty easy to script in.
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Great link! I can use that rgb2yuv program, but how to create 16bit SGI files? Even so, I still can't create YUV directly (but should be enough for 10bit yuv). Update: very cool! I've seen those images many times, never knew where they came from. I can transcode 8bit source to 10bit files, but where is my 10bit source generator? ffmpeg gives you a color generating function but it's only specified in RGB.
Just helps me verify if I generate it in script in 10bit someday, or use as is for now.Įven with ffmpeg, I have no way to generate real 10bit files.
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Any pro equipment should send this over SDI and you can just cap it. Yes, avisynth only uses 8bit, but I invented a pseudo-format which stores 16bits as two video clips, then functions to treat them as one.Īnd I didn't explaiin, I'm wondering if you have software that creates 10bit color bars originally. This is from the free SVT testing sequencesīut the original SGI scans can be found here I don't understand the programming behind it of course :) I always thought as soon as anything touched avisynth, it gets truncatedĪnd where did that parkjoy come from? It's definitely using all the bits. I can easily do blur/sharpen/gamma correct resize/color conversion etc.
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I can soon let you use many avisynth plugins with full 48bit processing - for example IVTC can be done on upper 8 bits as a proxy and then applied to 48bits. I think you would want a 10-bit or higher Y'CbCr source, or at least 8-bit RGB => 10-bit v210 Y'CbCr 4:2:2 If it's generated from avisynth, you can encode with ffmpeg (accepts avs)įfmpeg -i input.avs -vcodec v210 -an output.movīut HDColorBars returns YV12 according to info(), so I'm not sure how good the v210 sample will be. Ok, I'll try to whip some stuff up in the next few days. Really, it's up to you - what files would you use in production? I need these: 480p, 480i, and then all resolutions with sound. And yes, I could use more samples, specifically made ones for testing.