Losing quality... where?

doncarp wrote on 8/8/2003, 4:11 PM
A client (large company) of mine wants to add NLE to their video department. I was called in because the head of the video department, whom I will call Jack, was impressed after seeing some of my work. About 3 years ago someone had sold them a system based on Pinnacle Studio 8 that they were never able to get working. I tested VV4 on the system and yielded some results (more than Studio 8 would do) but the finished test video on DVD was unacceptable. The system was using an ATI video card as the capture card.

We captured from the S-video out on Hi-8 camera to the S-video in on the ATI adapter. The end result was very grainy. I suspected the ATI capture card was the weak link.

I had Jack bring the Hi-8 camera to my editing system for a test.
The “path” was Hi-8 camera s-video out, to Canopus ADVC-100, firewire from there to the computer, captured into Vegas Video. Render the 2 minute capture file to MPEG-2, burn to a DVD+RW using DVD Architect.

Jack took the DVD back to his studio for comparison since his monitors are better than mine. He called and said the quality of the video on the second DVD was much better than the first attempt, but the quality was not as good as the original from the Hi-8; it appeared to him like a second or third generation copy.

I’m hoping that the many gurus here can tell me where the quality loss is occurring. I need to be able to produce a finished product that is at least as good as what they are getting now, but hopefully much better.

They use Beta cameras for most of their projects, and Hi-8 for projects that don’t require as much quality. We can capture from S-video out on a Beta deck too, but we have not tried that yet.

Do I need to spec a DV camera for this system too?

Comments

riredale wrote on 8/8/2003, 11:57 PM
Thought I'd bump this back up to the top.

Once you pull in your video you should be able to produce a DVD that looks pretty much identical to the original image. Try getting the video into the system over some alternate path, such as through a DV camcorder. Better yet, urge them to capture on miniDV or D8; that way there will never be any degradation anywhere in the chain.
farss wrote on 8/9/2003, 12:55 AM
I suspect the issue here isn't Hi8 or the ADVC100, its the amount of noise on the original tape. Certainly a better camera for a given light level will give a better result but better lighting will help not just noise but also depth of field.

From what I've seen noise gets worse with mpeg encoding, the encoder has no way of knowing its noise, single pixel bits of noise can end up being made larger and also bandwidth that could be used for detail that you want is sucked up by the noise.


To do a real test try using material from the Beta cameras, preferably something shot with plenty of light, I think then they'll be impressed with the results. I've done just that and it looks as good as a hollywood DVD.