Analog to DV artifacts

DelCallo wrote on 4/23/2005, 11:06 AM
I've been dubbing my Hi8 footage to my Digi8 cam (which does not have pass-through) in order to capture for use in Vegas 5. For kicks, I bought a Dazzle DVC90 converter that allows for pass through from my Hi8 cam to my PC without dubbing. The image quality is surprisingly clear. Unfortunately, random frames contain artifacts - generally two diagonal rows of rectangularly shaped grey spots that appear in one or two frames - these things can crop up every three minutes or so of captured footage.

I can cut out the offending frames, and the result is not detectable in the finished footage - but it still bothers me. Furthermore, I don't want to spend the time to accurately cut these from my footage - nor do I want to depend upon my being able to spot all the bad spots and spend the time necessary to fix them on an ongoing basis - so, it's either figure out what the cause/correction may be, or it's back to the store with the DVC90.

The DVC90 device passes the video/audio signals to the PC via USB 2.0. I thought that perhaps other devices plugged into the USB ports on my setup could be causing the problem, so I disconnected all of them - it didn't work.

I disabled everything in my start-up folder, so that the only items running besides the (gag) Studio 9 quick start software is explorer (this is a WinXP machine with 1.5 megs RAM, plenty of drive space, etc). Still, no joy.

So, as I generally do when a problem has me stumped, I'm posting here in hopes that someone has some experience with this problem and some advice as to how to overcome it.

During capture, I can easily predict where the trouble spots will occur as the capture image (and counter) momentarily freezes then resumes. Whenever I see this, I know to expect artifacts at that point in the captured footage.

As much as I'd like to pin the blame on the Pinnacle software or this Dazzle thingy, the problem acts more like a problem in my system - as though some process is momentarily preempting my capture process and stealing CPU time to do something else.

I believe I've eliminated the most obvious causes - no other USB's plugged in during capture, no TSR's running. I'm stumped. Any suggestions welcome - I know already that I can go back to my Digi8 dubbing - but hoped to get this working as it would save me some time.

BTW, I know I can play Hi8 tapes in my Digi8 and transfer via firewire, but, that process, too, has left me with dropped frames and artifacts, and less than stereo sound. So far, the only foolproof method of transfer that I've found to work in capturing footage from my Hi8 is via dubbing from a Hi8 cam to a DV cam, then, sending the dub via firewire to the PC.

The Dazzle thingy is returnable within 30 days, and, if I don't find a solution soon, return is the path I will follow.

Thanks for any comments.


Thanks in advance for any help you can offer.
Caruso

Comments

Chienworks wrote on 4/23/2005, 4:36 PM
Most consider the Dazzle device to be a toy and not worthy of consideration.

Most consider USB to be a toy and not worth consideration, or at least not up to the task of transferring digital video.

You need a device that converts to DV and transfers through firewire. There are many available. Check out the Canopus ADVC line.
ezway wrote on 4/23/2005, 4:54 PM
Hello,
I wonder if a process is starting during capture? Sound like something is eating up clock ticks at a predictable interval.
OT I was rendering the other night when microsoft decided to send me an update for Anti-spyware, thanks m$.
anyway I just thought that if you could watch the process (sorted by %) then you might narrow it down to what is "interupting your capture".
The Canopus line is very good but very expensive as you know. The Canopus ADVC 1000 is a nice selection. http://www.canopus.us/US/products/ADVC1000/pm_advc1000.asp
I found it for sale for arourd $1400.00. That's seem alot to me, but you sort of get what you pay for. the ADVC 500 for around $900.00 is also good according to my sources, but I tried the 1000 so I can say that it works well.


Best Wishes,
Marty
DelCallo wrote on 4/24/2005, 12:21 AM
Thanks for the replies - wasn't certain if I would get any, but this board almost never disappoints.

ezway - I have been following your line of troubleshooting so far without success. However, I did use a setting in the Pinnacle capture utility to turn off preview during capture, and, so far, am working through a 90-minute capture, the first 20 minutes of which shows no evidence of the artifacts, and, since these were happening every three minutes or so, without jinxing myself, I dare say that this may have cured the problem.

Chien, in making this purchase, I was well aware that most (including myself) consider anything "Dazzle" to be a toy - but, for the price, and given that it is returnable, and, since I'm really just playing around, anyway, I figured I'd bring this thing home and give it a try (price at BB was $79.00 - way less than most anything Canopus which at $1400 or even $900 eats into the stash I'm hoarding to put towards a new cam) (have been tempted to plunk all down for a GL2, but may save a little longer and jump at one of the HD cams - we'll see).

I was unaware of, and didn't notice the Pinnacle connection until I had already given my debit card to the cashier, or I might have skipped the purchase altogether.

However, the bottom line for me is whether the thing can convert video with quality that is comparable to the results I currently obtain by dubbing Hi8 to my D8 then transferring to the PC via firewire. The initial results are a bit better for some reason - more detail in the video - slightly more saturation (albeit, my comparison is only done by lining up test clips on the V5 timeline and toggling between the two)..

The reason I am even messing around with Hi8 is because I recently purchased on Ebay an old, but once top-of-the line Sony Hi8 cam to compliment my D8 and a second Hi8 on multi-cam shots. This is a stop-gap measure to relieve me from having to rent or borrow digital cams on my multi-cam projects until I can upgrade to a second, more current digital cam. I spent only $365 for this Hi8 machine (and to my pleasant surprise, it takes beautiful pictures). I can't justify spending more than double that on an item which, if it works flawlessly, only relieves me from the extra time it takes to make a D8 dub before transferring footage to the PC. When I finally do buy a newer cam, it will probably feature pass-thru at which point, any converter will probably lay unused in my "can't-bear-to-throw-it-away-but-never-use-it-anymore" drawer.

We're straying a bit off-topic here, but, it would be fun to learn what real advantages the more expensive Canopus would offer over this $79.00 toy (or my D8) as a converter.

Chien, I don't pretend for a moment that my humble collection of equipment can keep up with current professional level or prosumer level equipment in terms of raw video quality. Nevertheless, I find it an enjoyable challenge to get the most out of what I have to work with, and, for me, Vegas is my "David's stone" that allows me to maximize what I can do with the equipment I have. If I do say so, myself, I find (and my clients find) my three-cam stuff more interesting than single-cam stuff shot on even the most expensive of cameras (I shoot mostly classical music recitals and amateur stage productions - plays, musicals, etc.). I don't know how you shoot that stuff with a single cam and keep it interesting - but, I'm open for suggestions.

Thanks again for the replies.

Caruso (aka-Del Callo - how do I change that? I don't use "del callo" anymore).
DelCallo wrote on 4/24/2005, 12:36 AM
Chien - one more point:

"Most consider USB to be a toy and not worth consideration, or at least not up to the task of transferring digital video."

I don't disagree with you - until I went into BB and saw this Dazzle thing, I didn't know that USB transfer of DV was even available. I have six external drive enclosures - all are firewire - but two can also interface through the USB port.

I'm sitting here, however, thinking to myself: "why do we (me included) develop these attitudes? Does it really matter how digital info is transferred from a converter to the PC?"

Now that I've turned off video preview during capture, it appears my USB 2.0 interface is up to the task, and digital is digital, right?

Just curious.

Thanks.

Caruso
DelCallo wrote on 4/24/2005, 3:23 AM
Ok . . . finished editing the first section of my capture - 35 minutes of capture - artifacts appeared three times - no set interval.

I have to think this is in my system, not in the Dazzle thingy or the Pinnacle software. Just seems more like a computer problem than a software problem to me.

My machine (it's a Shuttle XPC - 1.5 GB RAM, 3.01 gHz Intel Pentium 4 processor) should be plenty powerful. I'm wondering if disabling hyperthreading would have any effect.

Further suggestions/comments welcome.

Thanks.

Caruso
Chienworks wrote on 4/24/2005, 3:40 AM
The problem with USB is that it is a shared bus and can be used by many different processes at once. Many Windows functions will often probe the USB bus for inputs or other activity and these events can disrupt other USB traffic, hence many dropped frames. Real-time DV transfer needs a reliable pipe that won't get distracted by other traffic. Firewire is much better at this task.

Once you are finished with capture and are merely moving files around then USB 2.0 is certainly sufficient for transferring DV (and any other) files. Of course, these sorts of transfers aren't real-time, so the interruptions don't matter.

Have you checked out the Canopus ADVC 100 series? Some of these are as low as $200 on the street.

ps. Were you asking how to change your displayed forum name? It's under Forum Settings / User Name.
Laurence wrote on 4/24/2005, 7:11 AM
Are you by chance capturing footage to a USB drive? Capturing via USB and storing USB at the same time is bound to give you problems. If this is the case, try capturing to an internal or firewire drive instead.

I agree with the Canopus ADVC100 series recommendation though. I remember using my Dazzle box before I updated to the ADVC100 and thinking it wasn't that bad. On the small monitor in my studio it wasn't that bad actually. Then I saw a project projected on a screen that was about 6 feet diagonally. I could sure see some capture problems then! There were vertical artifacts running throughout the screen. On dark shots, the Dazzle capture didn't go all the way to black either. The quality of the Canopus ADVC100 is quite a lot better. If you audition it on a small TV you'll never see it, but on a high end big screen or projection it will just jump out at you!
riredale wrote on 4/24/2005, 10:05 AM
There are other ways for processes to be started up than by just putting the shortcut in a Startup folder. I suspect there are other things going on in your machine every few minutes. You might want to get some software such as this to see what is really being loaded when you boot up. This particular freeware utility has been very useful to me.
DelCallo wrote on 4/24/2005, 2:59 PM
To all: thanks for the additional info. I'm capturing either to my second internal HD or one of my six firewire drives. I doubt any of my footage will be displayed on larger than a 35-inch TV (what do you call it, one with a regular tube, LOL) and can probably live with any artifacts that don't show up on my crt or in my final renders when played back on a decent TV, but I can't live with these little squares that pop-up now and then.

Riredale, the software to which you pointed me - will it find things that running msconfig and disabling all misses? Just curious. I will probably download it and give it a try.

Caruso