Movie editing/Griggs brain pic. - Ranger-Forums - The Ultimate Ford Ranger Resource


Audio & Video Tech General discussion of audio and video for the Ford Ranger.

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  #1  
Old 02-10-2007
D.
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Movie editing/Griggs brain pic.

I finished editing a movie. I'm in final production in final cut HD. All teh effects are done in motion and look great in playback.

I do NOT wish to compress the bloody **** out of this as I do NOT want to loose quality.

I'm presently using DV-NTSC format.

IS THERE A HIGHER COMPRESSION NTHAT DOES NOT LOOSE QUALITY?

D.
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Old 02-10-2007
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First of all, I sympathize! I get so involved with what I've done that anything less than the DVD quality bugs me.

I really think you'll find better answers at these two forums:

http://www.doom9.net/
http://neuron2.net

Both of these sites have forums, downloads and links you may find useful. In your quest, you may find that only "expert" tools are available which will require some technical tweaking and you'll get your education over on these.

But, every compression loses quality, lol. I guess the question becomes, "is there a further compression that most people won't notice the loss of quality".

There are several things that go together in this, D. Probably the first thing you need to target is a bit rate. Alternatively, you can target a size for the file.

Once you have that, you can try various codecs and control programs for the codecs to see what you can get. Of course DivX is a biggie these days, but it's not for free as an encoder (the decoder is). There's one derived from the same techniques that is free (forget the name) -- but it's not as good generally.

Most encoders use transform matrices of some kind, and the coefficients which go in the cells can make a big difference in quality and compression -- but they revolve around particular types of material.

Generally, images where fewer pixels change/move from frame to frame can be compressed the most. Motion is the next biggest challenge, and flashing to a completely unrelated frame is the biggest challenge. Both of those require higher bit rates to encode. Motion takes less because often similar groups of pixels are simply moving from one location to another and the encoder can detect that using motion sensing algorithms and simply supply information on the change in the pixels location and quality rather than re-encoding them all.

Those matrices I mentioned can be tweaked to give better results with different color encoding vs. black and white vs. anime/cartoons etc. Each type of material has a "depth" that comes from the chromanance/luminance in each pixel and the number of bits required to express that depends on the overall "palette" of colors in the source material. There are different color encoding schemes used like YV12, YUY2, RGB15/16, RGB24 and so on (there are quite a few -- some not used in regular video) that have an effect on what you can do and sometimes a certain scheme may be a requirement to even use an encoder -- though some encoders do "conversion" for you if you supply the wrong scheme.

A note on conversions: the more you scale ANYTHING -- colorspace, dimensions, etc. -- the more decay in "quality" you can suffer. Just a word of warning. Sometimes it pays to have lots of harddrive space and use as little compression as you can until the final cut. However, that also requires a lot of overhead in terms of data transfer for previews and what not during editing so you need very fast equipment.

Another thing which can help is just a small amount of noise filtering. Though primarily used for analog video sources, some CGI effects create noise as a side effect. Using a mild noise filtering algorithm on the final result sometimes gives you a smaller file or lower bit rate.

I guess what I'm saying is: this isn't a "get the right appliance and all your problems are solved". Video encoding by it's very nature requires attention to a lot of detail and parameters and if you want to REALLY compress something, it can be quite an experimental process. It pays to learn what's available and what's possible and then decide what direction to try.

You will find that over there, like here, experts disagree so you must sort it out for yourself!

Edit: DOH! Memory is weird when you get older. I couldn't remember the name of the DivX alternative -- it's XviD, lol -- DivX backwards!

Last edited by n3elz; 02-10-2007 at 07:50 PM.
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Old 02-10-2007
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Nice to see you two getting along. lol
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Old 02-10-2007
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Oh, I still like D. -- I just disagree STRONGLY with certain directions he's gone in, lol. No mystery about it and I've made it pretty clear.

Doesn't mean I wouldn't help him though. This is one thing we can for sure still talk about!
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Old 02-14-2007
D.
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Buzzy..

I have nothing but good words in regards for ' Daddy Griggs '. He and I have hung out on several occasions and even swapped some parts for our trucks along the ways :).

DAMMIT! He called me ' Dave ' INTENTIONALLY the first time we met

Quote:
Originally Posted by n3elz
Oh, I still like D. -- I just disagree STRONGLY with certain directions he's gone in, lol. No mystery about it and I've made it pretty clear.

Doesn't mean I wouldn't help him though. This is one thing we can for sure still talk about!
Thats why I mentioned ya ( sorry so long in the reply, I've been actually doing contract work this week to try and get out of the house.. ).

I'm just going to spit it all out, see what your take is on it.

I have a friend from the local news stations. He sorta.. well.. I ' aquired ' his talents and equipment for an evening ( Man.. that sure doesn't sound good.. ). We did some filming on the Waterfront.. Its all of a certian SYC Yenko Chevelle getting taken by a .. 01 Ranger . It was done in 60fps format.

I was able to import it all into final cut, edit it ( 5 months to edit this thing! ) but the final movie is a 3minute entity.. thats 2.5 GIG big. Full Screen HD/Dolby5.1 . Not something easily Streamed/Shared.

I was HOPING to find a way to smack it down to.. Under 100megs. I was able to import it, Convert and output to NTSC.. but it was still HUGE ( about a gig ) and the quality took a mighty dive bomb.

I understand theres a proportional ratio of ' quality ' -vs ' size ' ( That didn't sound good either.. ) .. Damn.. Enuff.

I looked at part of that Site and picked up on a few things. If I edit a bit differently, not nessecarily cutting corners, but using different relms of textures and such, I can take down the initial video to about 1.3 gigs. It should be about..140megs when encoded.

I just need to figure out some more with editing. I'm quite certian theres something I'm overlooking. I've seen some great 30-60fps vids out there that are 4-5minutes long and under 100meg in size with VERY good quality.

I might stop by the Mac store and speak with their ' Final Cut Genius ' ( Technical staff for the sofwtware named - final cut - ). He might have some answers.

Good links though! Found a LOT of my questions answered there!

Danke!
D.
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