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1080i vs 1080p
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Yes, all DVD’s end up with progressive frames as I understand it. I don’t know why it works better with interlaced footage but I shot the same scenes in 60i, 1080/30p, and 720/30p and 60p but the best end result was the 60i footage even though it gets converted to progressive in Compressor. And again there was a big difference in FCS3. FCS2 never gave me the results I needed. I don’t know if these results are typical but it is what works for me.
Apple Certified Master Pro FCS 2
Sony EX-3
MacBook Pro -
I kinda liked ‘interrelation’ better. Means ‘keeping it in the family’ :0
– Don
Don Greening
Reeltime Videoworks
http://www.reeltimevideoworks.com -
Guys, I know this is a bit ‘off thread’ but since Compressor was referred to as an encoder may I just say how fabulous is the latest version of BitVice. I too used to get a lot of bother with EX footage (1080i) to DVD but now my discs are as good as tape. I edit in Media 100. Import EX footage in Apple ProRes HQ 422. export to QT still in ProRes, encode in BitVice (2 pass VBR average around 7 or less), format in Studio Pro and burn in Toast – to decent quality discs of course. BD’s are of course even better and Toast 10 does the business there.
Michael Slowe
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OK, I might get attacked for saying this, and I might be wrong. But I have had a couple of recognized experts tell me thus:
NTSC is interlaced. It is part of the NTSC spec. Therefore, an NTSC DVD can only be interlaced. This would explain why, when I try to make a progressive DVD in Compressor, the resulting .m2v file still comes out interlaced. Try this by opening one of your own “progressive” DVD files in Mpeg Streamclip and checking the properties. In my case, it still says it is 1080i. DVD players are able to de-interlace a DVD and put out a progressive signal, but all NTSC DVDs are progressive to begin with.
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[john sharaf] “But if you intend to also dvd publish, there’s every reason to shoot in 1080!
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The bigger the picture, the most complicated the downscallin.
If you want to go to SD Interlaced, you get thei50 from the p50 (or i30 from p60).
rafael -
[john sharaf] “This is exactly what I don’t recommend; 60p stresses the compression more than anything. 30p is the ideal frame rate for the web as it allows the compressor the time of two frames (1/30th of a second) in which to do its business.”
P50/60 on the web is awesome.
rafael -
[Chris Babbitt] “NTSC is interlaced. It is part of the NTSC spec.”
Right. NTSC video signal is always Interlaced.[Chris Babbitt] “Therefore, an NTSC DVD can only be interlaced.”
Wrong.
A DVD is not a “Video Signal” so can be Interlaced or Progressive.
The video signal that the DVD will put out, will ALWAYS be interlaced, whatever the content is Interlace or Progressive. When the content is Progressive we get the famous “PSF” stuff.[Chris Babbitt] “DVD players are able to de-interlace a DVD and put out a progressive signal, but all NTSC DVDs are progressive to begin with.”
This is a contradiction on what we just said.
DVD players can not de-interlace nothing because they need to put out Intelaced (NTSC).
rafael -
Sorry Raphael. I didn’t check before posting. I meant to say, “all DVDs are interlaced to begin with.”
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Hi can I just add my pennyworth ‘the world as i see it’:
I jumped ship to progressive as soon as I was able, heres the big question, is my logic sound?
Apart from those lucky enough to have a Samsung HD CRT, all footage ends up on a progressive scan device, be it PC screen, LCD or Plasma.
Any interlaced material will at sometime need to be ‘de-interlaced’.
De-interlacing by means of taking 50% of the vertical information, throwing it away and replacing with interpolated content.
So, here goes, is the vertical resolution of 720p better than 1080i once it has been de-interlaced and up on a plasma? hmm.
True, DVD video disc data is indeed interlaced and the de-interlacing and if required, scaling, performed by the player or the onboard software in the screen. If not all scaler algorithms are created equal then does the same apply to de-interlacing software?
Answers on my desk before registration please. -
This discussion has centered on the web and DVD.
I sometimes need to create video news releases, which are put on a website for local tv stations to access and use in their own stories. What should I be shooting for that? 1080p30? 1080i60?
I would very much like to find a table on the web which lays out each format, with its optimal purpose. Has anyone seen anything like that (and accurate, too?).
Bob C
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