[andersbk]

Whenever I try to build my project in DVD Studio Pro, I get this error:

MyShow (Video):Marker Position In Movie Not At GOP Boundary

help!

[-Q-]

Damn republicans always messing things up. (US government joke only funny to me probably.)

However, this thread may help you out.

[DP Roberts]

Originally posted by andersbk:
Whenever I try to build my project in DVD Studio Pro, I get this error:

MyShow (Video):Marker Position In Movie Not At GOP Boundary

help!

In case a knowledgeable person doesn't respond, here's an answer--accuracy may very:

GOP (Group of Pictures) is a small segment of a MPEG2 video clip. It's how the MPEG2 standard compresses video. The first picture in the group of picture is called the "I-frame" (for intra-frame or key frame) and is a complete image of the video frame in all its glory. Sebsequent frames in the GOP are either "B-frames" or "P-frames". The B-frames (bi-directional) contain the motion difference between the I and P frame before and after it, and therefore depend upon a reference to them to reconstruct an image. P-frames (predicted frames) are only based on the closest I or P frame immediately before it.

A Group of Pictures can have different patterns and lenghts of the I, P, and B frames. The most common pattern is IBP and IBBP.

If your marker is not on a B or P-frame, then It doesn't have enough information to reconstruct the image. Markers in DVDSP need to be set on an I-frame only. (This is the GOP boundary). MPEG2 from Quicktime uses a GOP length of 15 frames using the IBBP pattern (12 frames for PAL, 15 for NTSC).

If you set Chapter markers in FCP and use it (Quicktime) to compress your MPEG2, it will force an I-frame to the exact position you want. If you set Markers in DVDSP or another editor, then you might not have the precise control over placement, because the I-frames are already set in the pattern.

You haven't specified what program created your MPEG2 files, nor have you specified what program you're using to set your markers. Also, what version of DVDSP are you using. All of these things would be needed to answer your question, I think. Hopefully, the rest of this message increased your understanding of the process. BTW, it got if from the manual that comes with DVDSP v2. It's good reading. The "manual" from DVDSP 1.5 sucked...

Cheers

[andersbk]

I'm using DVDSP 2.0 and FCP 4.0

I've set chapter markers in FCP and exported with Quicktime, don't know why it doesn't work

I did the exact same thing last week with another project and it worked just fine.

I guess I'll try to export it from FCP again and see if anything changes.

[DP Roberts]

Instead of being helpful, now, I'm guessing. Do you have markers closer than 1 second of another (this includes a marker that's within a second of the beginning or end of the clip)?

[direktor]

DVDSP will also throw this error if you have a marker past the end of a video clip in a track.

[andersbk]

No, I've gone through my makers and there is more than 1 sec between them, and no marker outside of the video clip

But could the error come because the clip is too big for the disk?

The "disk-meter" is full and says 4.7 GB...