Avi Uncompressed Playback problems

magicool wrote on 6/4/2001, 5:10 AM
Hi all!!! I'm a new user of Vegas Video 2.0d. I have recently mad a clip and the result is very cool. Now I would like to put the video on a VHS.
The first thing that i'm trying to do is to render the video as Avi Uncompressed so that the quality is the best as possible. Unfortunately, when I do so and I try to play the video on media player the result is a video with a very good quality but it's absolutely not smooth!!! If I try to render with a ntsc or pal template the result is smooth but the quality is not as good as uncompressed. How can I resolve my problem?
My system is an AMD Duron 800 Mhz, 256Mb Ram and a Voodoo 4 video card with an IBM 30 Gb Ultra DMA Hard Disk. My operating system is Windows 2000.
Thanks in advance, Andrea

Comments

teomorell wrote on 6/4/2001, 8:41 AM
If you have a MiniDV camcorder, your video is already compressed in a 5:1 ratio; so if you save as uncompressed you are not improving the video quality.
To play an uncompressed video you need special harwared beacuse it is very demmanding on the system resources.
The NTSC template is the only one you can use to print back to tape your edited video.
magicool wrote on 6/4/2001, 9:45 AM
Thank you very much for your answer.
I don't think that my Camcorder anyway is a mini dv. It's a JVC but I can't remember the model (that's because it isn't mine but it's of a friend of mine...I am the computer technician, you know).
So I will try to render it as NTSC template.
Anyway, of which hardware do I need to play my videos in an uncompressed format?

P.S. Since I live in Italy, where the TV standard is PAL, what happens if I use an NTSC template?
teomorell wrote on 6/4/2001, 10:52 AM
Oops. MiniDV. It is also true for Digital8. I do not know if other formats use the same compretion.
If you use PAL, use the PAL template. With DirectX 8 it should work fine. This NTSC or PAL templates are to create AVI files that can be exported/printed back to the camcorder or to VHS tape.
If you want to display the videos on a computer you can to use another codec that needs less disk space (Video 5:1 uses around 3.7 MBS per second).
I have a PIII 933 with 512 MB RAM and a 7200 rpm HD with 33 MB sustained data tranfer rate and I can play uncompressed videos, so I think that you will need a speciall and-on card or maybe a P4.
chaboud wrote on 6/4/2001, 5:43 PM
For the record, uncompressed 4:2:2 video takes roughly 20MB per second sustained transfer (~20.00256) for just the video. The audio takes roughly 0.18 MB per second, so it really doesn't matter.

If you can sustain 21MB per second, you can do uncompressed NTSC.

PAL takes ~19.77MB per second for video, so you could actually use a slightly slower storage systemfor PAL.

It's really just splitting hairs though. 50mbps (6.25MBps) MPEG-2 I-Frame and DV formats look really good, and don't take nearly as much space. There is some loss from the compression, but it isn't nearly as bad as with DV25.