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Old 11th May 2017, 23:10   #19  |  Link
Sir Didymus
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Join Date: Mar 2004
Location: Italy
Posts: 953
Well, yes... It's not related to the PTS and DTS and SCR on their own. The timestamps are stored in 33 bit entries (having a time resolution of 1/90KHz, which is enough to store much more than 2 hours)... And it is not exactely 2 hours. The story of this limitation depends from the general initial target for the specifications of the optical support. Given that a single layer of a DVD disc contains 4.7 GB of data, and dividing by a bitrate of ~5 MBps (the half of the max allowed bitrate), you get more or less two hours of "good quality" material stored in a DVD-VIDEO disc. The initial target specifications were at the beginning of the story absurdely precise about "the storage capacity of 133 minutes of high-quality A/V in the DVD-VIDEO discs"...

Nevertheless what you get is that if you start with legit individual VOBs and you join them with a straight and simple binary copy without recalculating all of the involved PTS and DTS and SCR timestamps, you can not avoid these "2 hours" jumps and discontinuities among the chunks...

Last edited by Sir Didymus; 11th May 2017 at 23:14.
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