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DVD2One Variable/Constant Ratio
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joetex72
Newbie
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10. July 2003 @ 21:34 |
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Hi! I don't know if this question was asked before but, what's the difference between the variable and constant ratio in DVD2One?
And which should I choose when using Full Disk mode for the best quality when keeping menus, extras and the movie?
Key words being "best quality".
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AfterDawn Addict
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10. July 2003 @ 23:52 |
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hi
i'm not ofait with this but variable is better i think! but either are very simarlar probably not noticible?
Thx...
Nothing here to see, move along folks.
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joetex72
Newbie
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11. July 2003 @ 00:14 |
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Thanks for your input, Rotary.
Anyone else agrees or disagrees?
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AfterDawn Addict
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11. July 2003 @ 00:21 |
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hi
yes i have read posts on this and they say they look to our eyes the same! but in coding or encoding varible takes longer to process as its better quality! so i am going on that!
and if you run in a dvd drive that slight better quality could make all the diff from running or not?
thx...
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joetex72
Newbie
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11. July 2003 @ 00:45 |
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Many thanks again, Rotary. Variable Ratio it is, then. Your help has been greatly appreciated.
You guys and this forum are the best!!
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carlitob
Member
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11. July 2003 @ 07:51 |
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From my understanding it goes as the following
variable ratio is when the data in the files youre creating doesnt remain the same the whole time at 1 point it could be 2000KB/s at another point 6500KB/S for example you have 1 point in the movie which has a high ratio due to alot of movement, digital effects, action, which means to display this there is more data in a smaller space. and other parts of the movie lower ratio due to not so much stuff in the data.
constant ratio gives you the same ratio throughout the whole for example 6000KB/s throughout the whole movie regardless of the amount of data on any given part of the movie
variable does take longer but looks better in the end.
if im wrong don't flame me, this is just how i understand it.
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AfterDawn Addict
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11. July 2003 @ 08:21 |
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Carlitob is very much right.
It works like this:
The variable rate is chosen depending on the amount of screen movement. For instance, if it is a scene with two people talking and the backdrop stays the same, the variable ratio of the backdrop will drop, inlcuding the general aspects of thse talking.
However, if it were a fast moving scene, the variable bitrate and ratio would increase to take in all of the movements.
This allows for greater clarity for the fast moving scenes and the less moving scenes recieve lower bit rates, but similar clarity. To work, variable bit rate first has to read through the DVD to ascertain what is performed where. Thats one of the reasons it takes longer.
Constant is set at an average throughout, meaning that bitrates can be wasted on parts of the film such as the credits, where only the centre filed of text is moving. With variable, this part of the film would be reduced down a lot making a significant saving on the rest of the movie.
Chris
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carlitob
Member
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11. July 2003 @ 09:33 |
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see, who says im too old to learn
Don't ask a question that has been asked a million times already don't be lazy all the info you need is here: http://www.afterdawn.com/articles/
Pioneer DVD-+RW DL
Xbox and 360
PS2- DMS3
Over 250 Movies so far to know what I got PM me.
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baabaa
AfterDawn Addict
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11. July 2003 @ 09:34 |
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Would variable take longer to process whilst playing in a standalone then?
And could this be attributed to freezing/jumping issues, and then would constant be more beneficial??????
...............PIO is no go, DMA all the way...............
Beware of the Pixies - they move in over night and turn your life upside down
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AfterDawn Addict
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11. July 2003 @ 09:37 |
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hi
very interesting piont! but i suppose there will be some kind of prefetch system and buffer ram involved but food for thought!
Thx...
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carlitob
Member
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11. July 2003 @ 09:44 |
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Is original media variable or constant?
Don't ask a question that has been asked a million times already don't be lazy all the info you need is here: http://www.afterdawn.com/articles/
Pioneer DVD-+RW DL
Xbox and 360
PS2- DMS3
Over 250 Movies so far to know what I got PM me.
Dish Network Fully Open |
AfterDawn Addict
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11. July 2003 @ 09:51 |
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darn that is a good question!
EDIT:
Just noticed its the bouncing sheep smily box hacking guy clover leaf clan!
Nothing here to see, move along folks.
This message has been edited since posting. Last time this message was edited on 11. July 2003 @ 09:53
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AfterDawn Addict
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11. July 2003 @ 09:54 |
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Dont know the answer to whether the original media is variable or constant, [probably neither since compression isnt used. In reltaion to longer times to load, no is the answer. There will be no difference in times because all it is is a compression tool. It wont affect the performance of the disc.
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baabaa
AfterDawn Addict
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11. July 2003 @ 14:05 |
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LOL on that rotary - I prefer Rolex myself....can only look at one through a shop window though....... :-(
Nah, I am going to have a look into this one a wee bit deeper....
I can understand what your saying Oriphus about the compression tool, but when the title is played back, variable can really fluctuate, so would the player read it at a lower rate than if it was reading an original or higher or indeed both......maybe the freezing is because of such a steep rise in info being transferred in such a short time and goes off the scale.....
kinda like buffer under runs......
If you go from a still scene to bucket loads of action/explosions etc the variable bit rate/standalone are gonna go into overdrive...
(is it decoding fast enough to keep up with whats being read)
If your laser is out of wack - your gonna get problems - I'm sure.....
If the ram/buffer (as rotary stated) cannot cope with this sudden burst of data it's gonna get lost - like trying to find the corner in a barrel...
So for instance going from 1Mb/s to 6.5Mb/s in nano seconds - thats some increase, and if the wizardry inside the standalone is lets say poor, were gonna see issues.....
Do we experience this freezing/jumping if we use a pc dvdrom?
If not is it because it is constant. mmmmmm...
I don't know but this has got me intrigued and I'm just spit balling here.....
My brother has a latest cyberhome and it displays data rates - am gonna run some tests on it I think to find out - however whether the info is real time I very much doubt it but may highlight something interesting - DVD2One and see how it copes......
Were gonna get technical I think - stick with the Riteks......
...............PIO is no go, DMA all the way...............
Beware of the Pixies - they move in over night and turn your life upside down
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joetex72
Newbie
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12. July 2003 @ 03:33 |
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Whoa! I had no idea there were so much technical stuff involved with those ratios. Consider me educated.
Like I always say, this forum rocks!!
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AfterDawn Addict
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12. July 2003 @ 03:37 |
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hi all
This is "THE" place for debate!
NOW!
Anyone got any sex problems for "Doctor Rotary" ?
Thx LOL.....
EDIT:
On the weekends i like to be called MANDY! and BOB in the week!
Nothing here to see, move along folks.
This message has been edited since posting. Last time this message was edited on 12. July 2003 @ 03:40
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baabaa
AfterDawn Addict
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12. July 2003 @ 06:17 |
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Could you be an amalgamation of both - ManBob or maybe BobMand - as sometimes I am not fussy.....LOL
p.s - I am NOT being serious.......straight as a die......
...............PIO is no go, DMA all the way...............
Beware of the Pixies - they move in over night and turn your life upside down
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joetex72
Newbie
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12. July 2003 @ 23:14 |
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I don't know if I should start another thread for this one but, which ratio does DVDShrink use, variable or constant?
Any input will do.
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AfterDawn Addict
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13. July 2003 @ 10:55 |
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Variable.
BaaBaa, the reason i said about it not affecting the playback with either is that when it is encoded, the decoding process is standard and always operates at the same speed. It doesnt need to struiggle to decode faster scenes as all the 'struggling' would have been done in the encoding part of the process.
Quote:
So for instance going from 1Mb/s to 6.5Mb/s in nano seconds - thats some increase, and if the wizardry inside the standalone is lets say poor, were gonna see issues.....
I understand what you are saying, but the decoder doesnt need to know at what rate it was encoded as such. It is simply a play back decoding algortihm. From what i am aware of, the play back will be a constant ratio.
Chris
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carlitob
Member
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13. July 2003 @ 11:15 |
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OK smart guys, who can help with this one:
Quote:
OK, I know there have been numerous posts regarding this, but I was hoping someone has had a similar problem and I wanted to know of any viable solutions. I have the Matrix on PAL SVCD 3 discs. I turned it into 2 Elementary Streams .m2v for video and mpa for audio. The problem is when I use TMPGEnc plus v2.5 to encode to NTSC it chops of the last minute or so of the file. I am loading the SuperVideoCD (NTSC).mcf i have alos tried the SuperVideoCD (NTSC FILM).mcf file. and nothing. Any suggestions?
Don't ask a question that has been asked a million times already don't be lazy all the info you need is here: http://www.afterdawn.com/articles/
Pioneer DVD-+RW DL
Xbox and 360
PS2- DMS3
Over 250 Movies so far to know what I got PM me.
Dish Network Fully Open |
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baabaa
AfterDawn Addict
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13. July 2003 @ 11:51 |
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Oh yes Oriphus - quite right, done a little diggin and totally agree with what you said - something was whirring in my tiny little head and I thought I was sniffing at something....
Also, the skipping/freezing issue could also happen with fluctuations of the overall speed of the motor - with a VCR you hear the volume pitch slow up or speed up, but with a dvd player this would cause misreads and buffer under runs.
Now as the dvdrom operates on a closed loop system (feedback), then weaker areas of the dvd will cause slower/quicker speeds rather than a uniform speed - and this is 99% down to the media......
But still a very interesting thread - cheers for the gen...
...............PIO is no go, DMA all the way...............
Beware of the Pixies - they move in over night and turn your life upside down
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AfterDawn Addict
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13. July 2003 @ 11:55 |
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hi
Load (NTSC).mcf then load the "unlock" template one folder down from the folder the first template is in!
thx..
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AfterDawn Addict
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13. July 2003 @ 12:01 |
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hi
umm? wouldnt spin speed on watching main movie be the same through out? and laser travel speed changes? along the guides?
Thx..
Nothing here to see, move along folks.
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baabaa
AfterDawn Addict
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13. July 2003 @ 12:09 |
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Yes, the spin speed should be same throughout but as the laser travels to the outer circumference - the speed may need to be altered ever so slightly because:
The inner circumference travels slower than the outer circumference (like athletes on a running track - the outer track lags the inner so therefore they look as though they get a head start)....
So the speed may actually change ever so slightly in order to keep up with the streams...
Again spit-balling a little but just trying to fit some pegs into that square hole.....LOL
...............PIO is no go, DMA all the way...............
Beware of the Pixies - they move in over night and turn your life upside down
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AfterDawn Addict
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13. July 2003 @ 12:33 |
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Actually, i hate to be a painj in the ass and disagree. lol
I was under the impression that the spin speed is constant, depending on the quality of the media (there might be some variation). What i understood was that the DVD Spun constantly and the laser on its track moved progressively slower as it went along due to the ever increasing circumference of the the disc. That way, it could deal with the smaller (inner) end of the disc at the same roational speed as the larger (outer) end of the disc.
Thats my understanding of it anyway. Your right Paul, it has been a really interesting thread.
Wonder who can put us all straight on it lol
Chris
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