AVI to DVD with same quality.

[Hernan]

When I transform an AVI file (1GB) to DVD (with Premier Pro or Producer Gold), the DVD file that results weigh 0.5 GB approximately, because it was compressed and it lose quality. How could I transform the AVI to DVD (VOBs) without compressing like that don't it lose quality the image (Example: AVI 1GB to DVD 1GB)? Thank you

[manono]

To keep quality loss to a minimum, you give it a higher bitrate, and you probably want it about 3 GB for the final size.

[sohaibrazzaq]

give your dvd video the same bitrate as the avi have and the quality will be almost same and i am assuming that your avi is also in compressed format here.
If you have a 1GB uncompressed avi then there is no way that you can make it of same size when encoding for DVD, as max audio/video bitrate for dvd is approx equal to 10 MB/s while uncompressed avi has lot more then that.

[jagabo]

If your AVI file is MPEG4 (divx, xvid, etc) you'll need at least 2 times as much bitrate for DVD MEPG2.

[guns1inger]

If your AVI file is MPEG4 (divx, xvid, etc) you'll need at least 2 times as much bitrate for DVD MEPG2.

or more.

What you should have done was look at the length of the avi, put that into a bitrate calculator, then encoded to give it the correct bitrate for it's length. 2x for mpeg4 to mpeg2 is a minimum, and assumes the mpeg4 bitrate produced comparable quality to DVD. Most don't. This would require a bitrate around 2000kbps, whereas most mpeg4 encodes are done at around half that bitrate. To maintain the same quality you need closer to 3.x - 4x the size. It should never be smaller.

[vhelp]

Evening everyone

[ sec A ]
Source AVI Length vs. Compression sceme..
Think about it.. when your source AVI origin is divX/XviD based, and depending
on it's length, i.e., 2 hrs vs. 1 hrs, its a very good chance that it was highly
compressed to fit a given outcome. I've seen many many forms of this compression
format, but never seen anything aproach (assumed) original source, DVD.

Since you don't seem to have any control over those avi's, its a good chance that
you will have to feel (figure) out the best approach to *each* of those video avi
files you have for processing >>-- AVI -> DVD. This usually intails a battery of
trial n error test runs.

[ sec B ]
There are TWO types of video AVI's..
Those that are compressed to divX/XviD are one format, and the other more common
format via capture to AVI is the other format, i.e., DV; MJPEG; YUY2; etc.

These are the avi's that will give you maximum outcome vs. the above, when divX/XviD.

It's just that the sec A removes more of the video's detail than sec B. A lot of
the video is manipulated to fool the eye to some degree. This is it's ultimate
purpose, besides crunching for media space benefits.

Now, if your source is from sec A, then you have some work ahead of you. I think
that your's is such, and the aim of your (this) post is just that.. to achive the
maximum out of your divX/Xvid video files. That is hard for anyone here to really
answer. And since we don't have access to your avi's, all we can offer you is
best guesses

My suggestion..
Start with a very high bitrate and work your way down, reducing the bitrate in
each test trail run. The one that looks best to you, in terms of quality and
media space constraints, is your goal.

For example. If your media is DVD, then you already know it weights in at 4.3g
per disc. That means, you have that much bitrate to dish out, assuming that
your source is 1 hr in length. This example assumes a bitrate of roughly 9000
and with a decent audio bitrate as well. I usually use 192k for audio.
If your video each are 1 hr in length, then you have a basic starting point
to work with.

But, if you are trying to squeeze 2 hrs per disc, then you have even more work
ahead of you. Mind you, this is all assuming that your video avi's are in very
good quality. I doubt that. But, I will give you the benefit of my doubt

-vhelp 4049

[Hernan]

Thanks you very much. Very technical to me!!! I will study and test this and write you.