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Why are my file sizes different than on Youtube?
http://www.wideworldofwomen.net/Forum/viewtopic.php?f=18&t=159655		 Page 1 of 1
Author:  Nick! [ Fri Jun 01, 2012 8:41 pm ]
Post subject:  Why are my file sizes different than on Youtube?
When I make a mp4 video the file size is about 100MB per minute. But if I upload it to Youtube the file size is 75% less -100MB vs 25MB. Both videos are mp4. Both videos appear to have the same specs and look the same. Does anyone know why it is that way? Image

The point being that if I re-download my video from Youtube I can post it for members at a fraction of the download time and file size. With IDM it only takes 15 seconds to re-download 25MB.
Author:  HSF [ Tue Jun 05, 2012 8:28 am ]
Post subject:  Re: Why are my file sizes different than on Youtube?
I would assume that YouTube re-encodes the file for optimal streaming quality. I figure there's a fair amount of compression done for users with DSL and such.
Author:  joeycap666 [ Tue Jun 05, 2012 12:03 pm ]
Post subject:  Re: Why are my file sizes different than on Youtube?
Yeah, they probably compress them. Nick, you can use a program called virtualdubmod if you want to compress your clips.
Author:  Nick! [ Tue Jun 05, 2012 2:31 pm ]
Post subject:  Re: Why are my file sizes different than on Youtube?
Thanks for the info HSF. And I'll check out virtualdubmod JC.
:Kool
Author:  lateapex [ Fri Jun 08, 2012 8:40 pm ]
Post subject:  Re: Why are my file sizes different than on Youtube?
Out of curiosity, I compared two mp4 versions of your clip of Hannah Storm 5/18/12, from WWoW via Hotfile and Youtube.

Identical attributes
Duration: 01:49.
Resolution: 1,280x720.
Frame rate: 29.97 fps.
Audio codec: mp4a.

Different attributes, original vs. Youtube
Size: 123 MB | 28.4 MB (4.33:1 ratio).
Video codec: mp4v | avc1.
Bit rate: 9,443 kbps | 2,028 kbps (4.66:1 ratio)... aha.

So, Youtube's compression (along with the video codec change) seems to be the main reason for the large file size difference.

As long as there is no fast movement on screen... say, working out, dancing, leg crossing... 2,000-ish bit rate, combined with HD 720p, should be enough to do your sexy newsworthy subjects justice. :Kool
Author:  Nick! [ Fri Jun 08, 2012 9:04 pm ]
Post subject:  Re: Why are my file sizes different than on Youtube?
That is awesome to know. Great breakdown and explanation. Thanks a ton lateapex!
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