MKV output not adding chapter mark at time 0

[MrVideo]

Normally when creating a MKV file, VRD places a chapter mark near frame 0, though I've seen it placed anywhere up to frame 8.

But, I've run into an issue where VRD is not placing a chapter mark at the beginning of the file. Hell, I've manually placed a mark at frame 10 and when I run the job, which contains edits, there is no beginning chapter mark.

I tried setting one at the first internal IDR frame (15) and that failed. It wasn't until I set one and the 2nd IDR frame (24) that it worked.

The beginning chapter mark is needed for when the file is used in the creation of a Blu-ray. When played back, that first mark is used to indicate the first chapter. It is required.

 

[Danr]

Did you turn on the chapter at zero option on the Tools>Options>Chapters page?

 

[MrVideo]

Didn't know there was such an option. Probably because it was happening with it off. Only one file out of hundreds, over the years, have not had a chapter mark at zero, so I never thought about it.

Might explain while said marks at the beginning have been at frame 4, or 8 (for example).

 

[MrVideo]

We have an issue. Looking at that option again, especially after rerunning the job on the file that refused to put a chapter mark at time zero in the MKV file, I noticed that the option was for putting a mark at time zero in the chapter file. Well, it did that, but it still refuses to put a chapter mark at time zero in the MKV file.

 

[Danr]

According to the code, it will add a chapter mark at 0 only if there are other chapter marks in the file. How are you checking the chapter marks in the output MKV file? Have you tried to see if an MP4 behaves the same?

 

[MrVideo]

By opening the file in VRDPro. Because of the problem of edit errors at certain cut points and because VRD 758b (XP) also had an issue at an edit point, that I decided to recode files via my scripts. I pass along chapter info to the x264 encoder so that IDR frames are marked at those locations. Also, when it creates the MKV I pass it a MKV compatible chapter file, which has a marker at time 0.

When I read that MKV file into VRDPro, there is not marker whown for time 0. When I look at the same file with 758b, the marker is shown. I double-check with mkvinfo and yep, the time 0 marker is there.

So, that actual issue isn't that VRDPro isn't adding a time 0 marker in the file, it just doesn't display said marker if there is one.

 

[Danr]

Yes, that's correct the chapter at time 0 is no longer shown.

 

[MrVideo]

Any particular reason? Had me thinking that something was wrong. It lets me know for sure that the marker is there.