Sean Oneil
Forum Replies Created
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[Jeff Weisinger] “One of them is encoded as 23.98 progressive; received the source information of the MPEG-2 rip from MPEG Streamclip. Another is 29.97 interlaced; again from Streamclip. BOTH original DVDs play fine on my DVD player in my home and the software DVD player on my computer. I only notice interlaced artifacts on the computer monitor when looking at the interlaced MPEG-2 source stream.”
Anyone who encodes and authors a film to 29.97 DVD is a total hack. Aside from the visual problems it causes on certain displays (next paragraph), it is a total waste of bandwidth. The redundant 6fps eats into the effectiveness of the MPEG-2 encoding.
I recently watched Season 5 of The Wire. The show is filmed, but the DVD was 29.97 and the artifacts showed. At first I thought the person responsible was a complete tool. Then I realized that the show itself (oddly) uses 60i video occasionally (like surveillance cameras) so 23.98 wasn’t an option for them. So sometimes there’s a reason for it. But if there isn’t, then the person authoring is simply clueless.
Back to your point. Your TV at home is either A) an interlaced TV (CRT) so interlace artifacts are not visible or B) is a flat panel but has an intelligent deinterlacing chip like most modern flat panel TVs do. These work fine so long as the 3:2 cadence is consistent.
Your computer monitor is neither of those things, that’s why you see artifacts when playing on your Mac.
Sean
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[Chris Borjis] “In my experience NEVER EVER de-interlace footage. All that does is effectively discard half the resolution”
Chris, that is not good information you’re giving out there. All interlaced footage can be deinterlaced properly if you know what kind of footage you’re working with and you choose the proper deinterlace method for that footage. I suggest getting JES Deinterlace. Aside from be the best tool for this stuff, the help file is simple and explains all the methods and how they work.
Anyone who works with NTSC or 1080i, and wants to publish high-res video to the web needs to understand these fundamentals.
Sean
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[Jeff Weisinger] “That being said, the original question: does de-interlacing, then re-interlacing a piece of footage cause quality loss?”
The process of de-interlacing and re-interlacing in and of itself doesn’t cause loss. But in most cases doing this requires the video to be re-encoded. Re-encoding will cause loss if it is a lossy codec.
Sean
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Output 23.98, not 29.97. You can’t have pulldown video in a web clip. It will look horrific. This is actually a common amateur mistake.
Like Walter said, there are several h264 settings in Compressor you should use.
Sean
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[David Roth Weiss] “Hold on a minute fellas, this is one of rare those cases where everyone is correct. Progressive-source video (such as from film) is usually encoded on DVD as interlaced field pairs that can be reinterleaved by a progressive player to recreate the original progressive video.”
Nope. You guys are both wrong. It’s a 23.98 progressive scan MPEG-2 on all major studio DVD releases.
A DVD player will add pulldown on output during regular NTSC playback. But the encoded video is 23.98 progressive. No if ands or buts about it.
I just ripped 40 DVDs to do a spec promo fro Fox Home video. Every single one of them was progressive scan. But I’m mot basing my claims on this. It’s actually common knowledge that DVDs of movies are all encoded authored at 23.98 progressive.
Sean
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I think you need Flash to display the web player at 2x scaled.
Sean
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The VAST majority of DVDs now are actually 23.98 progressive.
Sean
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[Malcolm Oliver] “When I output a standard def 4:3 29.97 NTSC format as a quicktime”
Question. Why would you ever output 29.97 for the web when your footage is 24?
Sean
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[Kenyon Blower] “Is there an advantage to using the 4gb modules instead”
The only advantage is you have more open slots, thus the opportunity to add more later.
[Kenyon Blower] “I have 24TB Fibre Channel raid. Is there any reason to buy the quad channel 4GB Fibre channel cards vs the dual channel?”
I guess it could give you redundancy. I don’t know if OSX and/or your equipment supports this. As far as extra speed, then no it won’t help you. Your PCIe slot will be maxed out before you exceed that of a dual-4gb fibre. Unless you set it to 16 lanes – which you can’t because you’ll be using lanes for the graphics card and the Kona.
Just my 2 cents: I would go through a dealer. Don’t get me wrong, I’m the king of DIY. I’ve actually built a fibre storage server from scratch using Opensolaris. But given your situation you might want to cover your ass. If and when something goes wrong you’ll have someone to call who is obliged to get you back up and running. If you want to recover the extra costs, consider 8gb of RAM instead of 16.
Sean
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You need to use the Kona’s downconvert capability because that is the only practical way to add 3:2 pulldown, which is required for your type of conversion. The Kona handles this automatically.
Sean