UnderStanding Quality Bar?

vbimport

#1

Ok, I have Johnson Family Vacation. This is a Double sided disk, on 1 side is WideScreen and other is full screen. Movie is only 1:36 long. What I am confused about, on the WideScreen side if I have only just the main movie the percent is at 67%, while on the full screen side, it is @ 100%, movie is the same length in time. I don’t understand, Please Explain if anyone can.


#2

Does it have more than one angle for the wide screen version? Just pick the first one.


#3

@ Strachan

WideScreen side if I have only just the main movie the percent is at 67%

I only pick 1 thing


#4

Widescreen includes more information so the vobs will be bigger and need some compression.

Taroth


#5

Thats the only thing I can see, is that the widescreen needs more infomation, but I can’t see it needing that much more info.


#6

Does it have a DTS soundtrack as well? They take a lot of space.


#7

yea but why would there be more DTS information on the widescreen then the full screen, when the movie is the same length of time?

I am looking at the quality bar before I go into the sound and subtitle’s


#8

It may be 4:3 version with AC3 audio and 16:9 version with DTS audio, or perhaps the 16:9 version has many languages (English, French, German etc.). What does the quality bar say after you have selected just one soundtrack for each version?


#9

They are all the same with DTS and Dolby on both Widescreen and Full.


#10

This is where you’re mistaken - there is a fair amount more information for a widescreen version.

Think of it this way - a 4:3 movie on a W/S TV in 4:3 mode (so’s not to distort the sizes/shapes of things) will have black bars at left & right. A W/S movie will be exactly the same, PLUS will fill those bars at left & right for every frame of the movie. I have seen DTS tracks take 15-20% of a movie’s capacity, & video requires more data than any sound track (before compression, of course), so it is not so hard to believe, is it?


#11

PLUS will fill those bars at left & right for every frame of the movie

Are you saying that the black bars is the reason for more data, because of every frame that is made?


#12

The encoding bitrate of two different video streams may vary heavily (usually they are encoded between ~3MBit and 8MBit). While transcoding/remuxing the bitrate graph probably shows a noticable difference.


#13

No. I’m saying that the area where these black bars are at the left & right while watching a 4:3 movie on a widescreen TV in 4:3 mode is filled with extra movie width for a 16:9 version, thereby needing more data.

I have a 106cm (42") widescreen TV - it’s actual width is approx. 92cm (36"). Now, while watching in 4:3 mode, the width is only 69cm (27"), with 2 bars left & right of 11.5cm each (4.5"), or 23cm (9") total. That equates to about one-quarter of the total screen’s size for the left & right areas. So you could say that about a quarter of the total video information for a widescreen movie would be above & beyond the 4:3 version. Or, alternatively, you could say that the 4:3 version would only need about three-quarters of the data as the W/S version (video only).

That is a significant enough amount to certainly affect the quality bar to a noticeable degree, no?