accurate edits with DVDshrink

[johnsees]

I copied a movie from TV to DVD. The movie ends in a song, and immediately (less than a second) after the song ended, there was a commercial, which is on my copy. I used DVDshrink to cut out everything after the song ends. (Using reauthor and start/end frames.) I checked the files on my HD by playing them with WinDVD, MPC, and Windows Media Player. There was no TV crap, just the movie. So I burned a new disk and tested it with the same programs. Good movie, and it ends exactly where I wanted it to. But when I play the disk on my desktop DVD player, after the movie ends, I've got this big splash of commercial! What happened? How do I make accurate cuts with DVDshrink?

thanks for any advice.

[guns1inger]

You cant do it. DVD Shrink isn't an editor. It's ability to reauthor just sections is only I frame accurate. If you want to edit mpeg video, use an mpeg editor such as VideoRedo, Mpeg Tools in tmpgenc, cuttermaran etc.

[johnsees]

I would have thought "1 frame accurate" was as accurate as you could get. (Shows you how much I know about video!) Isn't video made up of a series of frames? And you just take out the ones you don't want? (Especially since I'm just trying to cut something off the end?)

[guns1inger]

Not 1 (one) frame, I (eye) frame. Mpeg uses temporal compression, where video is compressed across a series of frames based on the changes between frames. Each series is a called a group of pictures (GOP). The first frame, contains a complete image, the subsequent frames contain only the current frame (actually, this is grossly over-simplified, but it gives you an idea of how it works)

If you cut on an I frame, no encoding is required. As Shrink can't encode, it is restricted to I frames only. Properly built mpeg editors can cut to any frame by re-encoding the incomplete GOP left by the edit.

[aedipuss]

then, there are also the bothersome open and closed gops that blur the picture even more.

[guns1inger]

Trying to keep it simple here

[johnsees]

Learn something new every day, right?
Thanks for the info.
Oh, any idea why it looks good on the computer but not on the desktop player?

[hech54]

You also may run into audio sync errors too when doing "that" in DVDShrink.
Cutting/stopping at a pre made chapter point works fine however. I(used to) always try to create a chapter point in my DVD Recorder if at all possible beforehand...now I just use MPEGVCR.