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afterdawn.com > forums > dvd±r discussion > dvd±r for advanced users > why does a 498mb .avi, wind up as 3.79gb dvd?
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Why does a 498mb .avi, wind up as 3.79gb DVD?
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bvdd
Newbie
_ 		24. March 2006 @ 12:11 _ Link to this message    Send private message to this user   
Using Nero 6.
I'm trying to burn a 498mb avi file to DVD+R. After my first attempt
I wound up with a 3.79gb DVD. It plays fine but the quality is much worse than the .avi itself. I assume that's because of transcoding.

1. Why would burning this file increase the size by 6 times when transcoding to mpeg2 should make it smaller?
2. Is there another way to get this on DVD without losing quality?

Thanks all.
Bill
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larrylje
AfterDawn Addict
_ 		24. March 2006 @ 13:26 _ Link to this message    Send private message to this user   
an AVI is a compressed video file. When you convert it to DVD your in sorts uncompressing it which makes it larger in size. The quility will only be as good or worse then the orignel file that your converting it from.
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Jigen
Senior Member
_ 		24. March 2006 @ 20:21 _ Link to this message    Send private message to this user   
It is possible to reduce the size of an uncompressed or lightly compressed AVI by converting to MPG, but the AVI's you are using are already highly compressed beyond what MPEG-2 is capable of.
The reason that your new files are so much bigger is all about the bitrate. You are obviously using a very high bitrate no doubt to preserve quality, and that comes at the price of creating a gigantic file. Use a bitrate calculator to compute the optimal bitrate to suit your purpose, but if you want them to look good on a DVD you're going to have to get used to the fact that they will be several times larger than the Divx/Xivd AVI files you started with.
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bvdd
Newbie
_ 		24. March 2006 @ 21:09 _ Link to this message    Send private message to this user   
Thanks guys.
Ok .. so if I understand correctly:
The very best I'm going to get this AVI file to look after burned on DVD (as an mpeg2) is to use the highest bitrate I can which results in the largest file possible that will still fit on the disc.
For example, I want a DVD filled as close to 4.7gb as possible ..
and that's as good as it will ever get quality wise.
Is that accurate?

Larry:
I thought an AVI file was larger than an mpeg2 file, because it's always much larger when when I capture video in those two formats.
Is it different when CAPTURING?

Jigen:
I honestly don't mind the final size of a file .. as long as it fits on the disc. I DO care about quality though, and the original AVI is WAY better than the DVD I wind up with. The AVI looks like a DVD rip.
So there's nothing else I can do to keep it 'clean'?
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Jigen
Senior Member
_ 		24. March 2006 @ 21:46 _ Link to this message    Send private message to this user   
The highest bitrate won't necessarily result in the best image. There is a point at which the picture isn't going to benefit from it and whatever extra you put in is just wasted. I'd try to find a balance where the picture is as good as it's going to get, and squeeze as many episodes on there as possible.
BTW AVI is just a container. You can put damn near whatever type of video and audio in there that you want. When you capture as AVI you are capturing basically uncompressed or only some light compression and those are large files indeed. Stuff you download is DivX inside the AVI container and that is usually highly compressed video so the size is very small.
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bvdd
Newbie
_ 		25. March 2006 @ 06:29 _ Link to this message    Send private message to this user   
Thanks Jigen,
That cleared some stuff up for me.
So there's no other way to maintain the original DivX quality?

Bill
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Jigen
Senior Member
_ 		25. March 2006 @ 09:43 _ Link to this message    Send private message to this user   
What are you using to convert with? One of those "1 click" programs? I always used TMPGEnc myself so that I had complete control over what is done and how. This may make a difference in the outcome.
What I do these days is to use a DVD player that supports DivX videos. This way you don't convert at all so the picture is only limited by the quality of the original.
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bvdd
Newbie
_ 		25. March 2006 @ 21:13 _ Link to this message    Send private message to this user   
I'm trying different programs. I'll check out TMPGEnc now.
I'll also look around for a DivX compatible DVD player.

Thanks
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afterdawn.com > forums > dvd±r discussion > dvd±r for advanced users > why does a 498mb .avi, wind up as 3.79gb dvd?
 

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