Video recording prob. on 7500 with G3 upgrade--Help.

Discussion in 'Apple Collectors' started by Night Driver, Sep 4, 2008.

  1. Night Driver macrumors newbie

    Sep 4, 2008
    Not sure if this is in the correct forum...

    I just upgraded my old Power Mac 7500 with a 500mHz G3/1mb L2 upgrade card (Sonnet Cressendo). Prior to the G3 upgrade, the 7500 had been running a 200mHz 604e upgrade without issue.

    The 7500 is primarily used to record digital video. I keep the setup very simple. It's running System 7.5.5., has 256mb (2x128) of RAM (interleaved), and 2mb VRAM. The on-board video card is used to drive a 14" Audiovision monitor. Quicktime version is 3.0. Avid Videoshop 3.0 is used to record video.

    I picked up the G3 upgrade in hopes that video recording performance would be improved. And, indeed, it seems to be much faster than the 604e in this regard, but, now, unfortunately, every video I record using any sort of compression is streaked with bands of video artifacts. :(

    I've tried everything I can think of to remedy the problem, but the issue persists.

    Does anyone here have any insight in to what may be causing this problem and what I can do to fix it?
  2. RacerX macrumors 65832

    Aug 2, 2004
    I've run similar setups before... just not running that software (I generally use Mac OS 8.6 and Quicktime 6.0.2). You could try using a newer version of Quicktime, specifically a version that would take advantage of the G3 processor.

    On a side note, doubling the video memory (to 4 MB) and using a PCI video card to run the display will increase the capture abilities of the systems hardware. My 8600 works great in that type of configuration and it only has a G3/400 upgrade.

    Did you have any issues installing the G3 upgrade software in 7.5.5?
  3. jodelli macrumors 65816


    Jan 6, 2008
    Windsor, ON, Canada
    ^^^I second the motion. I had a 7600 with a 300 mhz Sonnet G3, 4mb onboard vram and an ATI Mach 64 video card for output. The ram varied but it was somewhere between 3-500 mb. The frame rate was low but I didn't get lines.

    Oh yeah, I think it was 8.6 as well; had 9.1 at one point.

    edit: With the Sonnet card I think I had to disable the onboard cache too.
  4. Night Driver thread starter macrumors newbie

    Sep 4, 2008
    Thank you for the replies. I ended up fiddling with things this evening and stumbled upon a solution, of sorts. It seems that as long as the video recording window isn't visible on screen, no video artifacts are generated in the recorded movie. :?

    Nevertheless, in searching for an answer to this problem, I learned that QT 5 was compatible with System 7.5.5. I didn't realize that it was still available for download, let alone compatible with System 7. Upgrading to QT 5 fixed all my problems. :eek::eek::eek:

    It also improved frame rate to the degree that I don't think this G3 upgrade was even necessary. lol

    Thanks again.

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