Welcome to Doom9's Forum, THE in-place to be for everyone interested in DVD conversion. Before you start posting please read the forum rules. By posting to this forum you agree to abide by the rules. |
|
30th April 2010, 16:47 | #1 | Link |
Registered User
Join Date: Apr 2009
Posts: 478
|
Deinterlacing Workflow Guides
Hi, I'm looking for advice on the order in which I should use various filters.
Let's assume my source is good. Not overly noisy or crappy framerate conversions or anything like that. My current workflow is thus, in plain English: Load Video using DGDecode TempGaussMC Encode with x264 --crf 23 --preset "Slower" My objective is to backup my DVDs, deinterlacing them with TGMC for smoother viewing while keeping file size low. It's a pain to be swapping discs. I like to keep the rips on an external hard drive for convenience Now, I'm wondering if there's anyway to improve my current workflow. Would adding FFT3DFilter(interlaced=true) before TempGaussMC help compressibility? I know denoising kills details, but I don't want it to kill TOO much detail. Thanks for your help! |
1st May 2010, 02:07 | #3 | Link |
Moderator
Join Date: Oct 2001
Location: Hawaii
Posts: 7,406
|
And most DVDs don't need and shouldn't be deinterlaced. If PAL movies, they may need the fields realigned or to be unblended (both pretty rare). If NTSC movies, they may need an IVTC or (rarely) unblending. You'd just be wasting computer cycles and, in some cases, seriously degrading the result. And what's the point of doubling the frame rate?
|
2nd May 2010, 22:03 | #4 | Link | |
Beyond Kawaii
Join Date: Feb 2008
Location: Russia
Posts: 724
|
Quote:
__________________
...desu! |
|
2nd May 2010, 23:14 | #5 | Link | |
Software Developer
Join Date: Jun 2005
Location: Last House on Slunk Street
Posts: 13,248
|
Quote:
Also if you have something that is Telecined and mostly has progressive frames after the IVTC (with only a few combed frames left), I certainly wouldn't bob that to the double framerate.
__________________
Go to https://standforukraine.com/ to find legitimate Ukrainian Charities 🇺🇦✊ Last edited by LoRd_MuldeR; 2nd May 2010 at 23:21. |
|
3rd May 2010, 09:20 | #6 | Link |
Moderator
Join Date: Oct 2001
Location: Hawaii
Posts: 7,406
|
There are only a very few cases where you'll need a conditional deinterlacer (TDeint(Full=False), Vinverse) after an IVTC, especially since they already have post-processing built in by default. In more cases like that an IVTC isn't called for in the first place (blended sources). If you have any examples handy, I'm sure we'd be happy to have a look.
Anyway, the OP wasn't talking about using an IVTC at all, but a pure double-rate deinterlacer for all cases. I stand by my statement. |
3rd May 2010, 12:53 | #7 | Link | ||
Software Developer
Join Date: Jun 2005
Location: Last House on Slunk Street
Posts: 13,248
|
Quote:
As you said already, most DVD's are either progressive or Telecined, so a proper IVTC should be sufficient in most cases. Deinterlacing most likely destroys quality for no benefit. Bobbing (i.e. doubling the frame-rate) of progressive/Telecined footage is even worse than "same rate" deinterlacing, as it produces lots of redundant data and thus hurts quality even more after compression. Anyway, blindly IVTC'ing everything isn't a solution either. In the rare case of "true interlaced" footage on DVD (as seen on "concert" discs), a deinterlacer (preferably a good bobber) will be required. Conclusion: The only thing that can be suggested in general is that one has to analyze the individual disc before deciding the proper way to deal with it... Quote:
If at all, you could use FFT3DFilter to remove the noise before TempGaussMC and re-add the noise afterwards: http://forum.doom9.org/showpost.php?...44&postcount=7
__________________
Go to https://standforukraine.com/ to find legitimate Ukrainian Charities 🇺🇦✊ Last edited by LoRd_MuldeR; 3rd May 2010 at 13:54. |
||
5th May 2010, 14:29 | #9 | Link |
Registered User
Join Date: May 2008
Posts: 1,618
|
No, that's dictated by pulldown flagging. Quite often in the 99% scenario, the movie itself is all film with pulldown but the credits/intro are flagged as interlaced. Whether they are actually interlaced or not is something you can only find out with your eyes, but since there are so many black frames anyway, often it's difficult to tell (and forcing film often won't create any noticeable problems).
|
|
|