Long - sorry!
OK. Tried GOP again last night.
Recorded Max and Paddy's Road to Nowhere (6 episodes on back-to-back), so lots of adverts to remove.
For simplicity I simply wanted each episode as a seperate chapter.
Went into Chapter Editing and the first thing I did was put it in GOP mode.
Set up my chapters where I wanted them (working on the assumption that the frames I was dividing on were the exact frames I would get in my finished DVD).
Some anomolies to note here which may be important:
For example, I went to the end of the ads and went forward frame by frame until I was on the 1st frame after the ads (frame 21 of the particular time for example). If I then went forward a few more frames and then back again, when I got back to frame 21 (the same frame 21) it was showing the last frame of the ads instead. How can frame 21 be both these things! This is the main thing that was confusing me.
This didn't happen all the time, maybe 1 out of 5 marks I did. When it did, just in case, I moved the chapter mark forward (or back depending on what I wanted) by an extra frame for the 'confused' frame was not used.
Any way - finished my chapters, and on the thumbnails everything looked spot on. Jumped back and forth through the chapter marks and everything was great.
Next I created a playlist of the chapters and I wanted.
Then I wanted each episode as a single chapter (after removing the ads there are two chapters per episode).
Started Chapter Editing on the Playlist. First thing I did after entering Chapter Editing was to put it back into GOP mode again.
Merged the 1st and 2nd chapter of each episode into a single chapter and gave the chapters names.
I started playing the Playlist off the HDD and jumped to each chapter point. Free-framed it and went bak and forward over the chapter frame-by-frame to see if everything looked OK. It didn't!
On one (only one) of the breaks (the one between episode 2 and 3 not that it's relevant) if you jumped to the start of episode 3's chapter all was fine. If you then went back by a single frame there was a frame of the ads (just one).
Maybe it's just on the HDD I thought - time to burn to a DVD-Video. Using a RW disc just in case it's got the rogue frames in.
Set up my menu (a chapter menu) and set it burning (with full test first).
Played the finalized disc and there are still rogue frames. Not just the 1 I saw on the HDD now, but others too (only a small amount - they are not every chapter break - but that's not the point - one of them is 7 frames long and some of 2 or 3 frames!!).
Can anyone please offer any advice on this? It is really starting to annoy me now.
I did all the Chapter Editing in GOP mode which was suggested here, so how has this happened.
Why was there the rogue frame between episodes 2 and 3 on the hard disk after making the Playist which was not evident by looking at the chapter breaks in Chapter Edit mode?
Why has it still burn to disc with rogue frames in (not just the 1 I saw) even though I am using GOP?