Can VV deinterlace on render, and what's NTSC DV?

awbl wrote on 10/12/2001, 3:12 AM

I've tried all combinations of field order settings at the project and event level, but I still get interlaced video when playing a rendered clip back on a monitor. Does VV deinterlace? It looks like it does in the preview window, but it could just be throwing out a field. For now, I know I can deinterlace using Virtual Dub.

For my second question... what exactly is NTSC DV? Is it a compression format, and if so, is it lossy?

Please forgive me if these questions seem a bit naive. This is my first foray into video editing. Thanks in advance!

Alan

Comments

SonyEPM wrote on 10/12/2001, 9:04 AM

Does VV deinterlace?

Yes, you can render as progressive and set the deinterlace type in project properties/video/advanced.
For external monitor, draft and preview quality don't do fields, but good and best do.

NTSC DV is an .avi-for-DV compression format, and uses the DV codec from Microsoft (installed by DirectX). ALL compression formats are lossy, but you can get pretty darn good picture quality with DV these days. If you want "lossless" video compression at broadcast resolution (720x480x29.97fps) you will have a huge data rate that very few hardware cards can handle.

pacho wrote on 10/12/2001, 11:45 AM

Not ALL compression formats are lossy.
HuffyYUV codec is lossless.

It yelds about 2x size of DV

HPV wrote on 10/12/2001, 2:56 PM

>>For external monitor, draft and preview quality don't do fields, but good and best do
----------------------------

I get fields in preview setting on my external monitor (OHCI output).

Craig H.

Rednroll wrote on 10/12/2001, 3:16 PM

"Not ALL compression formats are lossy.
HuffyYUV codec is lossless."

Do you have any background information on this statement? Or maybe point us to some websites that have reviewed this codec and state that it is "lossless". It's funny the whole point of compression is to reduce file size and get rid of lots of information that that particular compression thinks is not necessary for good quality. So something is always lost, which means it is not "lossless" .Or should we just believe you with no background information that this codec is lossless, just because you said so?

Thanks for any additional info,
Brian Franz

Chienworks wrote on 10/12/2001, 10:32 PM

"Lossless compression" means that no information is thrown away. The
codec is able to eliminate redundant bits that can be restored completely
upon playback. Obviously to retain all the information, the codec has to
be very careful in deciding which bits are truly redundant, and often must
err on the side of keeping more of the bits. This is why lossless compression
produces larger files than lossy compression.

If you'd like a concrete and practical example of lossless compression,
consider .zip files. They are often less than half the size of the original
file, yet quite necessarily restore every bit flawlessly when unzipped.

awbl wrote on 10/13/2001, 2:12 AM

Here's the url for the Huffy codec website. It seems to work great, though I haven't tried editing an avi compressed with huffy.

http://www.math.berkeley.edu/~benrg/huffyuv.html

Alan

awbl wrote on 10/13/2001, 2:17 AM

Thanks for the info! Those were exactly the answers I was looking for. I only wish I had come here sooner!

Alan

HPV wrote on 10/13/2001, 8:13 PM

>>I've tried all combinations of field order settings at the project and event level, but I still get interlaced video when playing a rendered clip back on a monitor. Does VV deinterlace? It looks like it does in the preview window, but it could just be throwing out a field. For now, I know I can deinterlace using Virtual Dub.
-------------------------------
I think the de-interlace only works when rendering to formats that support progressive frame rates. Like MPEG. DV is always going to be interlaced.

Craig H.

pelvis wrote on 10/13/2001, 8:45 PM

I keep hearing people say this codec is lossless. Maybe somebody will claim it is "Perceptibly Lossless" (like, you supposedly can't see any difference), but if the file size is smaller than uncompressed, then data has been thrown away somewhere.

What kind of frame rate are you getting in a Vegas Preview?

pelvis wrote on 10/14/2001, 8:39 PM

Slight correction: DV source material (from camera), and renders in Vegas, can definitely be progressive.

haraldpz wrote on 12/10/2001, 4:48 PM

I have plenty of HuffYUV files I'd like to edit before rendering them into another format.

Unfortunately, unlike other editing software, VV3 still does not show HuffYUV files correctly when loaded for editing, only unusable blurry/fuzzy pictures ;(

Did I miss a setting somewhere?

RonC wrote on 12/10/2001, 6:13 PM

I use the Huffman Codec all the time. Try setting the "always request RGB" button in the huffy configuration menu. I have found that has to be set inorder for VV or VF to use the codec.

Ron

haraldpz wrote on 12/10/2001, 6:35 PM

Sorry, but where do I find the HuffYUV configuration menu? It obviously is buried .....
and I am blind :)