On Saturday 26 August 2006 16:55, Michael Riepe wrote: > Hi! > > Ralph Glasstetter wrote: > > Hi, > > > > At the moment I'm trying to read that DVD back into dvbcut (to get it > > without pack stuffing bytes) and encountered a problem cuting the vobs. > > > > I just copied them to one file with "cat *.vob >out.mpg" and wanted to > > cut the chapters out with dvbcut. I noticed that for every chapter in the > > file the time stamps are starting at zero again and this seems to confuse > > dvbcut (eating lots of memory and producing no output at all if trying to > > cut the second chapter...the first worked!). > > You can't concatenate MPEG files that way. > In the special case where a single original MPEG for 1 titleset is > 1GB and dvdauthor (or whatever) slices it into several VOBs each 1GB (max) then my (limited) reading and some experiments suggest that those particular VOBs _can_ be joined by cat into a single file and successfully operated on by dvbcut.
or have I just been lucky? Ref: http://www.mpucoder.com/DVD/vobov.html This informal doc is ambiguous about VOBs, or overloads the meaning of VOB. At one point it says: [ quote ] A VOB file is an MPEG-2 system stream. This means that it complies 100% with the MPEG-2 system level standard, ISO 13818-1. [ /quote ] But later it admits that a physical VOB file (on the disk) might start at an arbitrary position: [ quote ] All the content for one title set (VTS) is contiguous on the DVD, but broken up into 1GB files in the computer compatible file systems for the convenience of the various operating systems. ... The files are broken up without regard to content, which is why it is difficult to process any file but the first, since it most likely will not start at a VOBU (start with a NAV pack). The usual split point is at 524,287 sectors (1,048,574 KB, 1,073,739,776 bytes). [ /quote ] Perhaps your particular DVD has a single titleset built from a set of MPEGs, one per chapter, and merged into bigger VOBs by the author program. (The dvdstyler config for creating such a DVD results in separate chapter lists for each original MPEG.) When I built a DVD like that I noticed that navigating the DVD became slightly more awkward - on my Philips player I could not fast-rewind (i.e. go backwards continuously) across chapter points. Dont know whether that is a 'feature' of the DVD spec, or a 'feature' in my DVD player. I too noticed instructions somewhere-out-there re using cat to simply join vobs (or possibly MPEGs). The first time I tried I got nonsense in dvbcut after the cut point - I dont remember the exact details but I certainly lost the audio. Of course, at that time I also did not have a sufficiently well patched dvbcut... When I create my own DVDs with one MPEG per titleset, so far I can (always?) cat VOB files in the same titleset to recreate a single dvbcut friendly 'mpeg'. ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ DVBCUT-user mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/dvbcut-user
