Audio & Video Software forum

General discussion

avi to mpeg, now i'm confused

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


jonah

.

Discussion is locked
You are posting a reply to: avi to mpeg, now i'm confused
The posting of advertisements, profanity, or personal attacks is prohibited. Please refer to our CNET Forums policies for details. All submitted content is subject to our Terms of Use.
Track this discussion and email me when there are updates

If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. Also please exercise your best judgment when posting in the forums--revealing personal information such as your e-mail address, telephone number, and address is not recommended.

You are reporting the following post: avi to mpeg, now i'm confused
This post has been flagged and will be reviewed by our staff. Thank you for helping us maintain CNET's great community.
Sorry, there was a problem flagging this post. Please try again now or at a later time.
If you believe this post is offensive or violates the CNET Forums' Usage policies, you can report it below (this will not automatically remove the post). Once reported, our moderators will be notified and the post will be reviewed.
Collapse -
Just asking.

In reply to: avi to mpeg, now i'm confused

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.

Bob

Collapse -
i admit, the very minimum Bob :-(

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...

thanks

jonah

.

Collapse -
I get it now.

In reply to: i admit, the very minimum Bob :-(

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.

Bob

Collapse -
i got it too Bob

In reply to: I get it now.

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

thanks

.

Popular Forums

icon
Computer Newbies 10,686 discussions
icon
Computer Help 54,365 discussions
icon
Laptops 21,181 discussions
icon
Networking & Wireless 16,313 discussions
icon
Phones 17,137 discussions
icon
Security 31,287 discussions
icon
TVs & Home Theaters 22,101 discussions
icon
Windows 7 8,164 discussions
icon
Windows 10 2,657 discussions

SMART HOME

This one tip will help you sleep better tonight

A few seconds are all you need to get a better night's rest.