Thanks for all the replies! I appears that one of many casualties of my Mac and OS upgrades is my Canopus video capture hardware. I have an old iMac with OS 10.12 that I am using as a dedicated central storage server. I could take the Canopus and all the analog A/V equipment and try to get it running there. But I'm willing to spend a little to update the hardware (and software?) and use my new iMac.
NEW QUESTION (should I start a new thread?):
HOW TO CAPTURE VHS TAPES with reasonably high resolution (720 x 480?) and STEREO SOUND
using iMac (2018 with USB 3.1 and USB 2.1 hubs) and OS 10.15.4 (Catalina).
Other installed software includes:
QuickTime 10.5
iMovie 10.1
VLC 3.0.8
Audio Hijack 3
BACKGROUND AND DETAILS
Per the discussions below, the Canopus AVDC-100 does not work with OS 10.15 and assorted A/V software. So I bought a Macromedia VC500.
iMovie 10.1 does not "see" either the AVDC-100 or VC500 as a device.
Quicktime 10.1 - as advertised Quicktime supports VC500 audio / video capture BUT Quicktime's audio is strictly mono. An unacceptable loss for some of my recordings. Also Quicktime's video output choices are limited. (I tried the Soundflower kludge to get stereo from Quicktime by using Audio Midi Setup to create and "aggregate device". But Soundflower is not compatible with OS 10.15.)
MOAVI suffers from the same problem as iMovie. It does not recognize the VC500’s existence. I can’t find any way to select an audio or video input device.
VLC 3.0.8 “sees” the VC500. Under the “File” menu is an “Open Capture Device” which produces a pop up screen allowing you to select the VC500 as a video and audio device. Unfortunately when you attempt to run a session with the VC500 selected as an audio device you get an “…unable to open MRL ‘qtsound:// AppleUSBAudioEngine:Unknown Manufacturer: USB 28286” error.
Debut 6.09 also sees the VC500 as a “Webcam" audio and video capture device. Unlike VLC Debut works generally well for video capture. Unlike Quicktime it allows you to select your encoding (e.g. .mp4). And you can adjust the audio and video quality settings for each encoding selection under “Encoder options”. Under “Video options” you can select resolution input as high as 1920x1080. However, like Quicktime, the audio capture is inferior. Perhaps there are some audio encoder options I need to set differently - but I'd prefer a simple stereo in - stereo out interface (see Audio Hijack below).
Audio Hijack 3 proves that the VC500 can detect and pass thru excellent audio. The Audio Hijack interface is easy to use. The VC500 shows up as a capture device. There is a large number of output formats to choose from and the capture is clear stereo. ...but no video.
Does anyone using a new (2018) iMac running Catalina (10.15.4) know of reasonably priced ($200 or less?):
Capture software for the VC500 OR (USB based) video capture hardware / software bundle
that produces reasonably high resolution (720 x 480 or better?) video like Debut (or better) and stereo audio like Audio Hijack.
I’ve been searching and testing for days now. The digital A/V forums are way over my head.