DVD File Size Wierdness....

  PaulB2005 17:56 05 Dec 05

I have 4 x 1 hour mpeg files

1 - 59m 59s - 2,380,696 KB
2 - 59m 40s - 2,369,388 KB
3 - 59m 43s - 2,367,710 KB
4 - 59m 23s - 2,355,798 KB

I'm trying to burn these to 4.7Gb DVD-R

All the files are in the same format.

I burnt 1 & 2 together. In order to do the quality had to be dropped to Long Play but it worked.

I've tried to burn 3 & 4 together but it won't let me. At first it shows the same error as with 1 & 2 (ie that the files are too big and the quality has to be reduced) but after i agree to reduce the quality it says it still can't fit them on a DVD! It shows the total amount of disk space used by 3 & 4 as hugely different to 1 & 2 even though 3 & 4 equal less than 1 & 2!!

Any explanation?

  PaulB2005 17:57 05 Dec 05

Sorry I'm using Nero Vision Express to burn them as movie files with a very basic menu set up. 1 & 2 left loads of free space after it was burnt but the shorter 3 & 4 videos won't fit!

Make your movie for 3 and 4 but select the option to burn to a hard drive folder. Then use RECODE to shrink to fit.

  PaulB2005 19:46 05 Dec 05

But then why does 1 & 2 fit on when they are larger?

I have no idea why they dont fit. All I am doing is providing a possible solution.

  De Marcus™ 13:08 06 Dec 05

Are they all the same framerate, pal or ntsc, 16:9, 4:3 etc?

  PaulB2005 13:09 06 Dec 05

tommo2000 - Sorry. You idea was very much appreciated but i really wanted to know why it behaved like that.

De Marcus™ - Yes but i'll double check now.

  PaulB2005 13:11 06 Dec 05

All as follows:


720 x 576

CCIR-601 D1

  PaulB2005 13:12 06 Dec 05

and PAL

  stlucia 13:13 06 Dec 05

Could it be something to do with the amount of compression being related to the actual content -- not just the original size -- of the files?

For instance, if you use WinZip (I know it's not the same), you'll see some files compressed 90% and some only 10%; so files starting out the same size end up different sizes when compressed.

  PaulB2005 13:22 06 Dec 05

Now you're thinking what i'm thinking.

If i follow then it's possible that a 55 minute clip could end up being bigger than a 45 minutes lip when burnt to DVD??? Once burnt to DVD it is "uncompressed" as it where? A file with more information will decompress bigger.

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