Audio & Video Software forum

General discussion

avi to mpeg, now i'm confused

by jonah jones / June 12, 2005 1:33 PM PDT

a few days ago i used Tmpgenc v2,5 to convert a 715 avi file to a 256 mpg

yesterday, using exactly the same procedure:
avi file #1 505M gave a 995M mpg
avi file #2 544M gave a 1G mpg

why such a HUGE difference in the resulting mpg file??

XP pro (sp2)
768 RAM
120G of HD



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Just asking.
by R. Proffitt Forum moderator / June 12, 2005 9:25 PM PDT

How much have you read about video compression? Remember that I can't teach such here, but in a nutshell or short paragraphs.

In short, video compression ratios depend not only on the settings but the content.


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i admit, the very minimum Bob :-(
by jonah jones / June 12, 2005 11:39 PM PDT
In reply to: Just asking.

but when you think "conversion" (2.2lbs to a kilo) you 'expect' that the end result -mpeg- will be in direct proportion to the input -avi-....

so, when i get an inverse? result, i start to think that something is wrong...




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I get it now.
by R. Proffitt Forum moderator / June 13, 2005 12:19 AM PDT

Your original content was compressed better than your new compressed content. I can think of where this happens with regularity. For example "Joe and a downloaded .AVI."

Joe downloads an .AVI and wants it on a DVD that plays on the common DVD player. Joe converts it to the standard MPEG2 and is confounded that the .AVI doubles or more in size. The reason is quite simple. MPEG2 is a very old compression algorithm and the original download may have been some spiffy newer DivX content.

There are far too many websites about how video compression works and I am forbidden to copy content here.

Another issue is that one video will not compress like another because the scenes or frames are not exactly the same.


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i got it too Bob
by jonah jones / June 13, 2005 2:00 AM PDT
In reply to: I get it now.

or, to para-phrase you, "Joe checked his downloaded .AVI."....Div-X



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