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17th October 2018, 09:40 | #681 | Link |
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From the screenshot it seems Sony is using bilinear downsampling for 444->422, this blends max 2 neighbor pixels as opposed to summed area.
I changed various interpolation options until I got very similar picture. For 442->444 it is still bilinear upsampling, no changes. Last edited by shekh; 17th October 2018 at 09:42. |
17th October 2018, 13:58 | #682 | Link | |
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Thanks again Skekh,
Just to be clear about VDub2: Quote:
Quote:
The change in behavior seen in 15.1.1 came in response to concern (from BMD forum members) about the quality of the export 422 sub-sampling: Which is when it became apparent that the 'new' behavior bore a striking similarity to that seen in VDub2 for 422 > 444 > 422. In fact, referring back to the series I posted earlier.... ....when I ran quality metrics (FFMPEG) on the matched v210 exports from the Resolve and VDub2 series, the SSIM scores were 1.000000 (lossless) for Luma and UV chroma.
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Nostalgia's not what it used to be Last edited by WorBry; 17th October 2018 at 15:08. |
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17th October 2018, 14:50 | #683 | Link |
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Bilinear. Even sample is centered so it is not blended but odd sample is blended.
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17th October 2018, 15:10 | #684 | Link | |
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Thank-you Shekh.
Quote:
Same pattern as seen on the Resolve scopes.
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Nostalgia's not what it used to be Last edited by WorBry; 17th October 2018 at 18:27. |
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17th October 2018, 18:21 | #685 | Link |
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Hi, I want to capture avi with an usb grabber which works without issue, but... the preview image not work.
Weirdly it worked at the first attempt. I go to capture mode and Video was set to Overlay and it was previewed. Then I opened Capture settings and the preview image got stuck... So I closed, reopen VirtualDub -> no more preview. So I changed "Display with Filters" and got a (distorted) preview, but it worked... also only for a moment. Next day, now every preview not show an image So I deleted the VirtualDub regedit settings to start from beginning, but no chance, I don't get a preview. The only way to get a preview is, when I open the Cropping dialog. So I wanted to cheat VirtualDub and start a recording during Cropping dialog is open. Of course, it doesn't work. It also not work to open Cropping dialog when it is in capture mode. Even open a second VirtualDub instance not work, because the USB grabber is taken of the first VirtualDub... Any idea how I get the preview back and what made the preview vanish. Many thank you for the idea. The Device itself is Dazzle DVC100 Video Device (DirectShow) Capturing the videosource just works, but without the preview I can't see if there is content. |
17th October 2018, 19:04 | #686 | Link |
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Morku, do you see anything in the log (Capture->Log)? What is capture format?
It is interesting that crop dialog can show preview. Maybe because it does not use audio. Try to disable it (previewing audio).
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17th October 2018, 19:19 | #687 | Link |
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Yes, there is an error:
[i] CapDShow: loading video filter state: (error code: 800704df, ERROR_ALREADY_INITIALIZED) [i] CapDShow: loading audio filter state: (error code: 800704df, ERROR_ALREADY_INITIALIZED) [i] Connected to capture device: Dazzle DVC100 Video Device (DirectShow) Audio preview is not enabled, only that audio capture is enabled and to show Volume meter. I switched the Audio device and for now, I have a preview with "Display with Filters". I reopen VDub, but with Audio "0 Line (DVC100)". Still, I can't say if there is a relation to the audio setting. Overlay preview still not work at all, no matter which audiosetting I pick (or disable). |
17th October 2018, 20:04 | #689 | Link | |
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Quote:
Also there is nothing special in the cropping dialog. I'm suspecting everything actually works but the window which should hold preview somehow disappeared. Can you see any preview with different device (usb camera?), or video file (emulation), or UScreenCapture? Edit: I misunderstood, do you now have stable preview using mode "display with filters"? Overlay mechanism is a bit vague to me, I consider it may work or not depending on some driver/system weirdness.
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VirtualDub2 Last edited by shekh; 17th October 2018 at 20:08. |
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17th October 2018, 20:46 | #690 | Link | |
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Quote:
Anything useful to add yourself ?
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Nostalgia's not what it used to be Last edited by WorBry; 17th October 2018 at 21:07. |
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17th October 2018, 20:55 | #691 | Link |
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No, just the Adobe tests - confirmed it's the same for DNxHD/DNxHR encode /decode
If richardpl's comment "Avid encodes behaves in similar way" means avid encode and re-import behaves the same way, that pretty much means that's how it is - since it's avid's own official encoder and decoder. Rant: Historically, it's the worst (near lossless) intermediate ever. Enormous issues and inconsistencies with levels across applications - all over the place. You almost needed to use Avid MC to ensure consistency . Performance isn't even that great decoding wise (FPS), and quality wise it's almost always lower in all tests , PSNR, SSIM or eyeball. This noise on the pattern test doesn't help either |
17th October 2018, 21:06 | #692 | Link | ||
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I was responding to richardpl there.
Quote:
Do I need to post some scope images or would that be "pointless" ? Quote:
Pity as its really the only 444 export option in Resolve on Windows. Cineform RGB 12bit exports at Filmscan 1/2 quality are too large for my purposes.
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Nostalgia's not what it used to be Last edited by WorBry; 17th October 2018 at 23:43. |
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17th October 2018, 21:21 | #693 | Link | |
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Quote:
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17th October 2018, 22:22 | #694 | Link |
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@shekh
I tried my Logitech 9000 Pro. Shown as "Logitech QuickCam Pro 9000 (DirectShow)". It is the same thing. Overlay not show anything. Display with Filters may work, but in a strange way (but always when I start capturing, the Preview is in that mode fine). Device Screen capture works without issue. I always get a preview (Overlay, Preview and Display with Filters). Than there is Microsoft WDM Image Capture (Win32) (VFW) -> it also always work (Overlay is greyed out, no problems with Preview and Display with Filters). This mode anyway is shaky and also the recordings aren't correct. So the only relation I see between my Webcam and USB grabber is DirectShow. Anything I could try here? |
17th October 2018, 23:22 | #695 | Link |
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And when you open cropping dialog, it is normal (not strange)? Btw how it is in strange way, may a screenshot show this?
I also received a somehow related ticket https://sourceforge.net/p/vdfiltermod/tickets/186/ Do you have Nvidia drivers?
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17th October 2018, 23:50 | #696 | Link |
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When directly opening an MKV (H.264/AVC) what does [+] mean when shown as the frame type (instead of [I], [B], [K], [P], etc)? Does it indicate a problem reading the file?
(also what's the difference between [I] and [K]?) |
18th October 2018, 00:14 | #697 | Link | |
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Quote:
some possible reasons: wrong framerate - you would see + at repeating intervals or variable framerate, wrong duration, also possible corrupt file If you think it is wrong maybe I need to look at sample. [I] is frame type as reported by ffmpeg, [K] is frame which I assume is keyframe (IDR) because it is marked as key in the index table. However I noticed weirdness about it. index in ffmpeg is in damn dts units/order which is slightly off real frames even in best case.
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18th October 2018, 04:39 | #698 | Link | |
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@ poisondeathray
Quote:
There I'm done. Sorry to interrupt more important VDub2 business.
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Nostalgia's not what it used to be Last edited by WorBry; 18th October 2018 at 04:51. |
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18th October 2018, 10:24 | #699 | Link | |
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Quote:
DGIndexNV/dgsource has no such trouble. Here's a sample, including the final (progressive) scene which plays back fine. The sample is a Trimmed TS output from DGIndexNV, rather than the full remuxed file I mentioned above: http://horman.net/credits.ts VLC and MPC-HC both have the same problem, causing stuttering. Windows Media Player is okay. I'm guessing it's purely an FFMPEG problem. |
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18th October 2018, 14:36 | #700 | Link |
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I did not study ts internals. It appears this format typically needs full parsing to understand frames timing (which I assume is what DGIndex is doing).
Also the magic of switching progressive and interlacing.. ffmpeg provides some info when decoding but I'm not sure what could I do with it.
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