Re: Chapter marks not where specified.

On Thu, 05 Apr 2012 20:24:13 +0100, Tom Brock wrote:

> What is not obvious is what, if anything, marks a VOBU start.

That’s this:

> 00000000: mpeg2 pack hdr, 0.460 sec
> 0000000e: system header; length=18
> 00000026: pes private2, PCI; length=980
> 00000400: pes private2, DSI; length=1018

A VOBU is defined to start with a NAV PACK, which is a PACK containing
a PCI and DSI packet. That’s it.

> What's also a bit curious is that times on the 'pes video 0; line
> are always about a second ahead of the GOP time.

Looking at the GOP header description here
<http://www.mpucoder.com/DVD/mpeghdrs.html>, that GOP time looks like a
timecode, rather than the usual MPEG timestamp (integer units of a
90kHz clock). Presumably it’s there for editing purposes, not for
playback purposes.

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