Jurassic Park 3 DVD Small?

[Pulp Catalyst]

i've just ripped My Jurassic park boxset, 1 & 2 was around 5.5 GB (main stream with Commentary)

However i just looked at number 3, main stream with commentary is 3.3 GB.

am i right to be concerned, isn't that extremely low for an mpeg 2 stream DVD, especially when considering all the effect and fast motion stuff Jurassic park has, and when factoring in that it's two predecessors were about 5.5GB.

i've never seen such a low bitrate DVD before.

the DVD in total is 7.8 GB, but all of the space is taken up by a lot of 2-3 minute clips...the mainstream is only 3.3GB (i have checked several times to make sure i'm not seeing things)

i just can't fathom why the DVD creator (company) would put such a low priority towards the main video stream on this DVD, it seems that the extras have been given the same priority as the main video stream.

could some advise please, have i got a bogus DVD?

i have ripped many DVD's, and only B movies (STV) are put on DVD-5, and even they i have seen to use the full space of a DVD-5 (around 4.3GB)

i'm shocked, and very concern that although the eye may not see it, Jurassic Park 3 is in fact inferior to in quality.

[AnonCrow]

JP I is 127 minutes, JP II 129 minutes, but JP III only 92 minutes long , so that could explain most of the difference.

There seem to be about half a dozen different trilogy boxsets available (not including pan&scan and widescreen or region variants) - which one have you got ?

[Pulp Catalyst]

i suppose when taking that time into account, yes that would explain some, but i will never accept why the DVD's creators decided to give the main stream the same priority as the extras.

although 92 mins and 127 is a significant difference, and does help elevate a lot of my concerns, but not all, i have done many 90 minute films and the streams i have seen have never dipped that low before, i'm use to seeing numbers ranging in the upper 4gb region (English streams only including directors commentary NO DTS).

but doing the math JP1 & 2 average about 4.1GB (i think...quick math in my head)

still feel uncomfortable, but thanks for the heads up about the time, forgot to factor that in, doesn't explain why the extras on the DVD was given so much bitrate (almost on par with the main movie itself....such waste) but does ease my concerns somewhat...thanks.

[setarip_old]

@Pulp Catalyst

Hi!

Instead of speculating about how you THINK things should be, the most obvious question - Have you simply PLAYED the original, commercial DVD in order to determine if there actually are any quality problems?

[Pulp Catalyst]

yes i have, and the quality looked really bad (i do a lot of encoding and have been doing so for nearly 12 years now), which is why i started to investigate, realized the size differential when comparing to the other two films, although a large part of my concern was based on the FACT that i rarely come across a Blockbuster DVD 90 minute action film that only weighs in at 3.3GB in size....

oh... for the record the average size of a DVD Blockbuster film (90mins) with 2 Audio tracks (1 AC3 5.1 & 1 AC3 2.0) is about 4.5 - 5.5 GB (that is a fact sir...not speculation)

anyway i got my answer and a considerable in-depth explanation in another forum.... too put it bluntly.... some dvdbox sets are of a lower quality than there separate counterparts, more worrying still, yes it has been noticed that on some occasions DVD's extras are done with a considerable higher bitrate that many would deem wasteful.

[-TiLT-]

The bitrate of a mpeg2 encoding depends on how much DNR was applied. Humans do not experience grain as movement, the encoder does.
The production studio possibly thinks about the final size of a DVD in one of the last producion steps. First concern is visual quality and for the average audience, less grain is better quality.
Less grain is lower bitrate as I stated first.
Two pass encoding is only applied on demand or if single pass encoding would overshoot media capacity. And again, more DNR or less edge sharpening is an alternative easy way to deal with the situation.

Extras compress less good as they don't get a professional treatment. Shot with studio cameras they are usually 59.94i instead of 23.976p. Higher framerate and interlaced encoding mode raise the bitrate.
Again the production studio does not want visual impact on extras, as for their client, it is part of the production. Think of returns of angry customers that claim bad visual quality of the extras. It would be legit, as it is part of what they bought.