4G files from a predicted 4.31G (is IC 8% out?)

[MackemX]

using IC I have just backed up Back To The Future part 1 and got a resulting file of 4.37 GB (4,698,556,416 bytes)
talk about close and being lucky 1st time

I oversized to 4.71Gb, but I wrote the figures down 1st to get an indication of what is going on regarding my issue with undersizing

I had 3 titles I could adjust and the menu makes it 4 out of a possible 17
menu=90MB
title1=5.35Gb
title3=1.59Gb
title14=19mb
plus very small titles=7.06Gb which is also size of my ripped folder

the info in the cellset window for main movie (title1) was

4.19(5.35)
3.23(3.81)@76.93%
and the resulting file was 2.99(3.4) after putting it in IC again

& title3 was

1.51(1.59)
773(861) @ 50%
and 834(0.9) again in IC

others too small to show but these 2 above will do for my reference

doing the maths I can now see that it's an 8% difference between what IC predicted to fit onto 4.31Gb and the actual % needed to fill disk

title1 = 3.23(predicted)/2.99(actual)=1.0803 (+-0.003) due to inaccuracy of filesizes only shown in Gb

title3 834/773=1.0789 (bit more accurate due to more accurate filesizes due to MB shown)

so basically it's just under the 8%

this 8% difference relates to the transcoded size of each title and the actual outcome

so using this formulae in my movie title originally with the predicted title1 size of 2.99Gb then adding 8% of 2.99 to it making 3.23Gb and so on with the rest of the titles would have saved me all the bother of guessing @ 4.71Gb

the actual slider bar % increase relating to title1 is 5.61% from 71.32% to 76.93% (add 8% of predicted transcoded size to transcoded size and slide bar until it transcoded size reaches that size)

I reckon 7% is a safer margin due to only 2 decimal places for Gb not giving the actual size of file correctly

I'm gonna try again with BTTF 2 with an 7.5% increase and will post the info, but if anyone else can add the before and after info I would appreciate it (can I ask people if possible to write down the figures before and after like I have including disc totals & % settings etc)

I hope you can understand which way I came to this conclusion, and if it's totally wrong which it probably is then I will keep looking for the answer

p.s. if you do add the extra % and the file is tadge too big at the end just run ONE of the smaller files through IC again (only takes a few mins) then use IFOEDIT to reinsert it into the main files, so you don't have to run the whole process again (haven't tried it but surely it should work)

[MackemX]

here are my BTTF disc 2 results

menu
62.32
43.56 @ 60.06%
Title 1
5.00(5.89)
3.54(3.54) @ 64.24
title 2
1.13(1.18Gb)
580(634MB) @ 50.31
title 8
138(144)
69.29(75.69) @ 50.31
title 13
17.99(19.21)
9.05(10.27) @ 50.31
all the rest @100% but very small in total but I dont think 100% transcoded files affect the end result

total disc size 7.30Gb(7475MB)

I had set my menu's & extras to what I wanted and the 8% I wanted to add to Title 1 (main movie)

to work out what I could add I took the total of each predicted filesize using MB as units

43MB+3625MB(3.54Gb)+69MB+9MB= 4325MB or 4.226Gb (remembering 1GB=1024MB)

then I calculated 7.5% of that total(just to be safe) = 324MB or 0.317Gb

I took 5MB off just in case for rounding down and this made 319MB(.03115Gb) to add title 1

this then gave me 3.5215Gb but I decided to play it safe again and reduced it again to 3.51Gb @ 70.25%

well, guess what

final disc size was 4428MB only 61MB shy

if I had used 8% originally without taking off any safety margins I should have used 3.547Gb which is an extra 39MB I should have added yet again!

that would have been even closer to 4489MB barrier but because of Gb being only 2 decimal places a Gb figure can be out by as much a 9MB!, so I played it safe and rounded down

gonna try Simpsons Disc 2 again as last time I got 3.99Gb but didnt extract any audio only reduced video so I will do the same again and add the 8%

[nickel]

Interesting theory that I will try out later. My trouble was with K-19. Here are the scenarios:

Movie only (used reg hack to drop all other title sets). I set slider to 4.67 and I got final output of 3.95 (Windows Explorer GB).

So I added the trailer at 30% quality. I set slider to 4.67 and final output was about 3.97 and the movie was still around 3.95.

So I did the full disc. Set the slider at 4.67 and final output was "correct" - 4.3 GB (Windows Explorer reporting 4.3 GB is equivalent to the 4.7 GB for DVD media). And movie was still around 3.95.

So then I tried doing just the extras I really wanted to save with the movie. The final output was short again. I realized that it was short by an amount roughly equivalent to the size of the extras that I chose to drop.

I suspect that even though the reg hack allows title sets to be dropped, Instant Copy is still doing the math for its predictions based on a full disk.

So next I will test out what happens if I set up my source VIDEO_TS folder with only the movie and use IfoEdit to make new IFOs so that InstantCopy doesn't see any other extras. I suspect that, then, I will get a movie only version that fills the blank media. Then I will try the same, but adding in the extra features that I want to keep. I'll report back here.