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29th April 2008, 01:20 | #1 | Link |
EphMan
Join Date: May 2004
Posts: 737
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Quality Improvement From Video Capture
I have a digital stream from the digital cable box captured via firewire. It appears to already be dvd-compliant 704x480 MPEG-2.
Do you guys think any avisynth filters would potentially yield a nicer result if I re-encoded it? Here's a sample of the video: http://www.filefactory.com/file/6d5e09 And a couple stills (ImageShack doesn't support PNG anymore): http://rapidshare.de/files/39259894/...tills.zip.html Last edited by EpheMeroN; 29th April 2008 at 01:22. |
29th April 2008, 03:39 | #2 | Link |
Sleepy overworked fellow
Join Date: Feb 2008
Location: Maple syrup's homeland
Posts: 933
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MCbob rm_logo dfttest crop+spline36resize
This is the bare minimum. edit: just had a doubt in my mind... is this rule 6 violation? Last edited by thetoof; 29th April 2008 at 03:58. |
29th April 2008, 05:38 | #3 | Link |
EphMan
Join Date: May 2004
Posts: 737
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It's from regular television... no need for rule violations!
And MCbob would be to double framerate yes? Why would I want to do this? The stream is 704x480 29.976fps wouldn't I only want to bob this video if I was to filter it with a denoiser or something? |
29th April 2008, 19:45 | #5 | Link |
Sleepy overworked fellow
Join Date: Feb 2008
Location: Maple syrup's homeland
Posts: 933
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MCBob().Selecteven() would keep the original framerate. To my eyes, deinterlaced video always looks better (if you play it on a TV, you won't notice the difference, but when you play it on a computer, the program has to deinterlace on playback, which is always worse that what a great mocomped bobber like MCbob can do)
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29th April 2008, 20:12 | #6 | Link | ||
EphMan
Join Date: May 2004
Posts: 737
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Quote:
Quote:
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29th April 2008, 20:28 | #7 | Link |
Sleepy overworked fellow
Join Date: Feb 2008
Location: Maple syrup's homeland
Posts: 933
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Well, what I suggested before (dfttest for denoise + rm_logo to remove those annoying logos) is enough imo to improve your source. If you can't see the visual difference, it'll at least improve the compressibility of your source. For the bottom, I'd suggest that you crop it (unless it's important for you) and use Addborders. Yes, it will be lost anyways in the overscan, but it'll make your source more compressible, again.
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29th April 2008, 21:38 | #8 | Link | |
EphMan
Join Date: May 2004
Posts: 737
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Quote:
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30th April 2008, 00:12 | #10 | Link |
Sleepy overworked fellow
Join Date: Feb 2008
Location: Maple syrup's homeland
Posts: 933
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Yeah, it's slow, but it's good.
You can download it here. Make sure to put libfftw3f-3.dll in your system32 folder. For SD sources like yours, I usually use Code:
dfttest(sigma=x,smode=0,sbsize=5,tbsize=5) But if you don't care about compressibility, don't want to remove the logos and if the video looks good to your eyes, I'd encode it straight to DVD without processing. |
30th April 2008, 01:31 | #11 | Link | |
Derek Prestegard IRL
Join Date: Nov 2003
Location: Los Angeles
Posts: 5,988
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Quote:
Interlaced video lets you cram 60 pictures per second into 30fps, which is fantastic for sports and other "lively" things. If you throw away half that temporal resolution you will most likely notice it! Of course, if you're talking a flatpanel TV that just throws away half the fields... then yes you won't notice a difference and in fact the MCBobbed version will look a _lot_ better. I try to backup my interlaced stuff to full rate progressive - that way I can spend all the billions of CPU cycles to MCBob it, then filter as necessary, and encode to 480p60 - keeping the full temporal resolution. Win. ~Misfit
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30th April 2008, 08:04 | #12 | Link |
EphMan
Join Date: May 2004
Posts: 737
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Will that dfftest filter help combat this? I'm noticing it at certain spots during the video... appears to be artifacts from compression in the source?
And is it just my eyes or do the colors seem a bit off? The faces on the two hosts look a bit too orange'ish. Last edited by EpheMeroN; 30th April 2008 at 08:09. |
30th April 2008, 08:11 | #13 | Link |
Sleepy overworked fellow
Join Date: Feb 2008
Location: Maple syrup's homeland
Posts: 933
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Check this thread (especially post #7) vinverse + deblock_qed will help you.
Also read the part where you can filter only a part of the video if the problem is not present throughout your clip. |
30th April 2008, 08:15 | #14 | Link |
Sleepy overworked fellow
Join Date: Feb 2008
Location: Maple syrup's homeland
Posts: 933
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For the colors, play a bit with tweak and coloryuv. The "color correction" section of this website will help you.
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30th April 2008, 12:29 | #15 | Link | |
Registered User
Join Date: Dec 2002
Location: UK
Posts: 1,673
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Quote:
If such "field dropping" TVs exist, then the mcbobbed version will either look identical to, or worse than, the original. Why? Because the TV is throwing half the fields away! It's either keeping the fields from mcbob that match those exactly from the original, or it's keeping the "created" fields from mcbob that don't. As it is not using both, it cannot benefit from mcbob. Of course mcbob deinterlacing looks better on a PC than most on-the-fly deinterlacing - but dropping 60i to 30p to put it on a DVD for watching on a TV is an abomination - unless you like that fake film stuttery motion look – I don't, and I think it would look terrible on the posted clip. Cheers, David. |
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2nd May 2008, 21:51 | #18 | Link |
EphMan
Join Date: May 2004
Posts: 737
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Tweaking Deblocking
Is there a way to setup deblocking so it ONLY deblocks when blocks actually appear? I've used deblockers in the past when only probably 4-5% of the actual video had blocking present, and in return the parts with no blocking get overly smoothed or flattened.
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