Deinterlace or not for film look? (for HDV 720p) at DVinfo.net

Johnny Cheung · May 10th, 2009, 05:18 PM

Hi,

I am just wondering if I am shooting HDV (Panasonic HVX 200 with 35mm adapter) 720p progressive (24fps), do I really need to deinterlace the footage in post-production to create the film look?

I mean, I already rendered some footage (using ppro) and it looks pretty good, it has the film look, so I am just wondering if deinterlacing it will enhance it? or is it just redundant to do it?

thanks

Jeff Harper · May 10th, 2009, 06:08 PM

If your are shooting in 24p it is not interlaced to begin with, why would you deinterlace it?

It's like having chocolate milk and asking if adding cocoa would make it chocolate. It's already chocolate.

Tripp Woelfel · May 10th, 2009, 06:18 PM

Depending upon how smart your software is, deinterlacing progressive footage could cause additional problems. In spite of working with Premier since release 1.0, not PPro just plain old Premier, I'm still not sure of all that PP does behind the curtain. Doing what you suggest would make me wonder if PP would take progressive footage and try to deinterlace it anyway. Not good.

Since I deal with both progressive and interlaced footage all the time, I pay particular attention to my frames and fields.

Matt Vanecek · May 10th, 2009, 08:11 PM

Quote:

Originally Posted by Johnny Cheung

Hi,

I am just wondering if I am shooting HDV (Panasonic HVX 200 with 35mm adapter) 720p progressive (24fps), do I really need to deinterlace the footage in post-production to create the film look?

I mean, I already rendered some footage (using ppro) and it looks pretty good, it has the film look, so I am just wondering if deinterlacing it will enhance it? or is it just redundant to do it?

thanks

Johnny,
It depends on your intermediate codec. NTSC HDV is generally 1080/60i (PAL is 1080/50i, I believe) or 720 (interlaced? not sure, I don't use 720). Various cameras wrap their 24/30 progressives in the interlaced stream, but I'm not sure how the Panasonic handles that. Various decoders can detect the progressive stream wrapped in the interlaced stream properly. Cineform is what I use. PPro can also detect the progressive stream wrapped inside the interlaced stream and play it back.

Not sure what the Panasonic does on the 720p (i.e., how that HDV stream is written to tape). However, it should still be handled correctly by your intermediate codec (or by PPro natively, if you have a current/recent version).

Deinterlacing progressive video will destroy the video's quality. If you're using modern software on progressive ingested from an HDV stream, then you should have no need to deinterlace, as your footage should be interpreted correctly by the software. You should only deinterlace if you recorded in the camera's interlaced mode (but I'm not saying you *have* to deinterlace). If you recorded in 24p, 30p, 30f, whatever, then your software should detect that and you should NOT deinterlace.

Thanks,
Matt

Johnny Cheung · May 11th, 2009, 09:13 PM

thanks guys, i use cs4, so i guess the software should detect it and i dont have to deinterlace..

May 10th, 2009, 05:18 PM	#1
Johnny Cheung Regular Crew Join Date: Dec 2003 Location: San Francisco CA Posts: 38	Deinterlace or not for film look? (for HDV 720p) Hi, I am just wondering if I am shooting HDV (Panasonic HVX 200 with 35mm adapter) 720p progressive (24fps), do I really need to deinterlace the footage in post-production to create the film look? I mean, I already rendered some footage (using ppro) and it looks pretty good, it has the film look, so I am just wondering if deinterlacing it will enhance it? or is it just redundant to do it? thanks

May 10th, 2009, 06:08 PM	#2
Jeff Harper Inner Circle Join Date: Jun 2005 Location: Cincinnati, OH Posts: 8,425	If your are shooting in 24p it is not interlaced to begin with, why would you deinterlace it? It's like having chocolate milk and asking if adding cocoa would make it chocolate. It's already chocolate.

May 10th, 2009, 06:18 PM	#3
Tripp Woelfel Trustee Join Date: Jan 2008 Location: North Conway, NH Posts: 1,745	Depending upon how smart your software is, deinterlacing progressive footage could cause additional problems. In spite of working with Premier since release 1.0, not PPro just plain old Premier, I'm still not sure of all that PP does behind the curtain. Doing what you suggest would make me wonder if PP would take progressive footage and try to deinterlace it anyway. Not good. Since I deal with both progressive and interlaced footage all the time, I pay particular attention to my frames and fields.

May 11th, 2009, 09:13 PM	#5
Johnny Cheung Regular Crew Join Date: Dec 2003 Location: San Francisco CA Posts: 38	thanks guys, i use cs4, so i guess the software should detect it and i dont have to deinterlace..