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file size increase?

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file size increase?

Postby bradsta74 » Thu Dec 05, 2013 1:16 pm

When I add a 500mb avi file to a project,why does it become a 2.2gb file(high quality setting)? How can I make it remain the same size(500mb)? Thanks
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Re: file size increase?

Postby Ken Berry » Thu Dec 05, 2013 7:46 pm

In effect, you probably can't. There are over 800 different video formats which use the .avi extension. Some -- and I suspect yours is one of them -- are highly compressed, such as DivX/XVid which are in reality a type of mpeg-4 using the .avi extension. Depending on the degree of compression, you can usually fit about 90 minutes of such video into about 800 MB.

A DVD on the other hand, by international standard, MUST use mpeg-2 within certain parameters. And mpeg-2 is far less compressed than those types of .avi mentioned above. In the process of making your DVD, the .avi will be converted to mpeg-2 and expanded in the process to a much bigger file. Some quality will also be lost as mpeg generally, whether mpeg-2 or mpeg-4, is a lossy format and each conversion loses some quality. Anyway, that basically explains why your original .avi has now expanded by over four times its original size.

The only way I can think of to keep the DVD-compatible mpeg-2 down to 500 MB would be to apply a degree of compression -- which is done by lowering its bitrate -- down to a point where the resulting file is 500 MB. However, that would also involve an enormous quality hit, as bitrate also determines quality, and the higher the bitrate, the higher the end quality. I think you would find that the resulting mpeg-2 with a very low bitrate would be essentially unwatchable.
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Re: file size increase?

Postby Winfory » Mon Sep 05, 2016 11:03 am

Ken Berry wrote:In effect, you probably can't. There are over 800 different video formats which use the .avi extension. Some -- and I suspect yours is one of them -- are highly compressed, such as DivX/XVid which are in reality a type of mpeg-4 using the .avi extension. Depending on the degree of compression, you can usually fit about 90 minutes of such video into about 800 MB.

A DVD on the other hand, by international standard, MUST use mpeg-2 within certain parameters. And mpeg-2 is far less compressed than those types of .avi mentioned above. In the process of making your DVD, the .avi will be converted to mpeg-2 and expanded in the process to a much bigger file. Some quality will also be lost as mpeg generally, whether mpeg-2 or mpeg-4, is a lossy format and each conversion loses some quality. Anyway, that basically explains why your original .avi has now expanded by over four times its original size.

The only way I can think of to keep the phen375 http://ohdivinehealth.com/phen375-reviews/ DVD-compatible mpeg-2 down to 500 MB would be to apply a degree of compression -- which is done by lowering its bitrate -- down to a point where the resulting file is 500 MB. However, that would also involve an enormous quality hit, as bitrate also determines quality, and the higher the bitrate, the higher the end quality. I think you would find that the resulting mpeg-2 with a very low bitrate would be essentially unwatchable.


now i understand. i actually did the same thing and also result to a size that doesn't range on the same size that i was expecting. but through your concern, i finally have an idea. you are such a big help. thanks!
Last edited by Winfory on Sun Oct 16, 2016 11:53 pm, edited 1 time in total.
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Re: file size increase?

Postby Winfory » Mon Sep 05, 2016 11:07 am

bradsta74 wrote:When I add a 500mb avi file to a project,why does it become a 2.2gb file(high quality setting)? How can I make it remain the same size(500mb)? Thanks



Probably the AVI file you put is quite large. Also the quality is the main cause why its too heavy. Ive seen some softwares online that can lower the quality.
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Re: file size increase?

Postby susan albert » Mon Nov 14, 2016 10:09 am

Winfory wrote:
bradsta74 wrote:When I add a 500mb avi file to a project,why does it become a 2.2gb file(high quality setting)? How can I make it remain the same size(500mb)? Thanks
panniculectomyhyperthymesiadorsalgia



Probably the AVI file you put is quite large. Also the quality is the main cause why its too heavy. Ive seen some softwares online that can lower the quality.


If i use XVID file rather than AVi file will the size be managable of not?
Fordyce
Last edited by susan albert on Sun Dec 25, 2016 3:42 am, edited 2 times in total.
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Re: file size increase?

Postby canuck » Mon Nov 14, 2016 6:42 pm

susan albert wrote:
Winfory wrote:
bradsta74 wrote:When I add a 500mb avi file to a project,why does it become a 2.2gb file(high quality setting)? How can I make it remain the same size(500mb)? Thanks



Probably the AVI file you put is quite large. Also the quality is the main cause why its too heavy. Ive seen some softwares online that can lower the quality.


If i use XVID file rather than AVi file will the size be managable of not?



What do you mean by manageable? You will have to give some information on your source file (size, length in time) and what you are trying to do with it - create a DVD or just a video file.
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