I recorded entirely new eyeTV 1-min MPEG-2 clip captures (3) from one VHS tape after I had installed the new OS X combined and, as I said, still received the Error message, "result code = -18768". Toast will burn one of the video clips, but not multiple video clips.
This "Error" message was the reason for my original post. I was trying to quickly solve the much larger problem of determining which eyeTV encoding settings would best suit the capturing of VHS tapes for burning to DVD discs. Therefore, by burning to one DVD disc, multiple short VHS clip captures from one tape using different eyeTV encodings, I would be able to evaluate the different quality vs. file size settings offered by eyeTV. Without being able to burn multiple video clips, I would have to burn individual clips, of which there are six encoding settings that I'd like to evaluate. But, Toast should be able to burn multiple MPEG-2 video files, hence my original post here regarding the error message.
The "much bigger problem" is that my first attempts in early February to capture VHS tapes and edit them with eyeTV (you can't edit using DVD recorders) and then burn them with Toast, produced inferior quality or very large file sizes depending on my encoding selection. eyeTv does offer standard MPEG-2 automatic options (1.8gb/hr.), etc. But, they also offer custom settings... up to 6.4gb/hr (15mbps). It's between this range that I was recording the short clips of different encoding settings.
Recording/capturing live TV programs with eyeTV in it's "Standard" 1.8gb/hr encoding setting produces excellent quality and acceptable file size. I haven't tried to capture DVD to DVD with eyeTV, but I have read on discussion boards that it also works very well. But, my first attempts at recording/capturing VHS tapes in MPEG-2 for editing and burning to DVD discs with acceptable quality vs. files size was unacceptable.
Well, tsantee, your persistence (thank you) forced me to spend considerable time yesterday and today backtracking everything I've done over the last month and a half... and I successfully recorded duplicate quality of several different VHS tapes (5-min. segments) using the eyeTV "Standard" 1.8gb/hr encoding. Not only that, I successfully burned three of the video recordings simultaneously in Toast without encountering the Error code.
Regarding the Error code, it is my opinion that the reason I was getting the Error code when attempting to burn multiple video clips simultaneously, is that the "Half-PEL" check-box was not enabled/activated in the "Customs" encodings panel. This has to do with "Motion Estimation"... and the manual says, "When this option is activated the motion estimation operation also looks for pixels that move only one-half of a pixel from one frame to the next. This setting should usually be enabled and should only be disabled if speed is desired over quality." The problem is, that this check-box is in the "Custom" encoding panel, and I don't believe it was checked/enabled by default. I always used "Automatic" encoding for all the burning I had been doing, resulting (in my opinion) in the Error code. When I activated this check-box and clicked "OK" to close the "Custom" encoding panel, it remained activated even when I used the "Automatic" encoding selection for my successful multiple clip burning session (no Error code).
Regarding the issue of quality and file size when recording VHS tapes in eyeTV... I don't know what I had been doing wrong, but I'm able to record using the "Standard" encoding of 1.8gb/hr and it looks the same as the original tape.
So, I want to thank you for all your suggestions and help. Thom