Analog capture into DV format. Why such small files? Why the poor quality?

I am capturing 8mm video cassettes with an "ADVC 3000" converter, using an S-Video into the converter and then via FireWire into my PowerMac G5.

All is almost going well, but the files seem to take up so little space on my Hard Drive. That's a good thing, but I'm wondering if it's recording into Digital Video or not since the files seem so small. Smaller than normal for DV at least, or maybe I'm just paranoid.

In the scratch files, when I press Command-I for information, the Codecs on the QuickTime files are DV/DVCPRO-NTSC, Interger (Big Endian), Timecode.

So I'm guessing they are DV files even though they look like crap.

My question is this though. When I put these old analog tapes on iDVD, burn it, and put it in my DVD player, the quality of my video looks pretty crappy on my hi-def television. But when I watch them on my computer in a tiny window (the tinier the better), the video looks great. A large window, or my Television, gives a bad picture. My theory is that it's my hi-def television and computer monitor, and that on an old Analog TV set, the videos would look much sharper.

Should I play 8 mm analog video, converted to DV in Final Cut Pro, on an older Analog T.V. set for best viewing results?

Anyone have any comments to share on the science of this?

G5, Mac OS X (10.4.7), FCP 5, Canopus ADVC 300 converter

Posted on Jul 8, 2008 3:27 PM

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8 replies

Jul 8, 2008 3:55 PM in response to yoshiman

It's probably not looking great, because it wasn't that great to begin with.. DV takes up about 4.7min/gig... so they're not particularly large files. Might do some color correction to improve the picture quality a bit, it makes a big difference anyway. 8mm wasn't much better than VHS... about 1/2 the resolution that a DV camera would shoot...

Up-converting the now SD to HD on a plasma doesn't look too good either. Would look better on an SD set usually.

Also the compression being done in iDVD isn't as good as you can get using Compressor and then DVD SP for the authoring. Might work with that instead.

Jerry

Jul 8, 2008 4:07 PM in response to yoshiman

DV is DV. Your settings upstream of the convertor might be adjustable (get out the manual) but what's coming out of the convertor is just plain ol' DV. No adjustments possible.

Original 8mm video was pretty lossy. I think there are only 230 or so horizontal lines of resolution being upconverted to DV's 480 or 486. So all of the faults and defects in the original format are being magnified.

bogiesan

Jul 8, 2008 11:26 PM in response to yoshiman

A TBC placed in-line between the 8mm playback device and the converter will do a lot to help stabilize the analog signal. And a stable signal is a better signal. The Canopus ADVC300 analog-to-digital converter has a built-in TBC.

DVD SP = DVD Studio Pro, part of the Final Cut Studio package.

Just about ANY SD content will NOT look it's best when stretched to fit an HDTV screen ... even when the TV is in 4:3 mode, it's still being stretched.

-DH

Jul 9, 2008 10:13 AM in response to yoshiman

Yoshiman,

Forgive me if you did know this, the TBC is a Time Base Corrector. (I am pretty sure corrector is right). Anyway, the 8mm has time code striped on it with the image information. If the playback device is not able to read the time code, the picture quality suffers. (remember tracking adjustments?).

The TBC will intercept the time code coming from the tape and provide accurate, consistent time code to the system. I use one from DataVideo, and have been happy with it whenever I have to work with old tapes. If you have a lot of tapes to capture, you might look into one.

My two disclaimers: this is a very general explanation, I simply don't know the physics of what's going on, and secondly I am not a power user of FCS, but have gotten so much from this forum I am trying to give a little back. Take what I bring to the table with that in mind - I'm proficient, but not an expert.

Jul 9, 2008 3:37 PM in response to John SAE

John

You are confusing timecode with sync:

Timecode is a digital code in hours minutes seconds and frames which allows each frame of video to have an individual address, nothing to do with timebase errors.

Field and line sync signals are contained in the video signal so that the picture can be accuratly processed and then displayed on a TV screen.
The TBC removes the unstable sync siglals and replaces them with a much more stable signal.

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Analog capture into DV format. Why such small files? Why the poor quality?

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