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Compression Confusion
Posted by Andrew Crittenden on November 7, 2009 at 6:29 amIs there a place anybody knows where I can study up on everything about video compression?
I’m constantly baffled. For instance, I just exported from a QT movie to FLV. The first movie was compressed at 400kbps (medium quality) The second at 700kpbs (high quality). The final file size for the 400kbps was bigger than the 700!
Does this make sense to anybody?
Thanks,
Andy
Andy
Daniel Low replied 16 years, 6 months ago 3 Members · 10 Replies -
10 Replies
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Daniel Low
November 7, 2009 at 9:47 amAre they both the same length?
__________________________________________________________________
“There’s no chance that the iPhone is going to get any significant market share. No chance.”
Steve Ballmer To USA Today: 30 April 2007“We and Apple are neck and neck and we’re chasing the two
other players,”
Steve Ballmer, referring to Nokia and Research in Motion. October 6th 2009 -
Daniel Low
November 7, 2009 at 9:44 pmPlease detail the exact settings for both.
__________________________________________________________________
“There’s no chance that the iPhone is going to get any significant market share. No chance.”
Steve Ballmer To USA Today: 30 April 2007“We and Apple are neck and neck and we’re chasing the two
other players,”
Steve Ballmer, referring to Nokia and Research in Motion. October 6th 2009 -
Andrew Crittenden
November 8, 2009 at 1:11 amOriginal File:
QT Movie 641.8 mb
Dimension 1280 x 720
Codecs Animation, Integer
Duration 00:27
Total bit rate: 196,072export Movie to Flash Video
Flash 8 Medium Quality 400kbps
Video On2 VP6 at 400
Audio MPEG layer III MP3 at 96kbps stereo converts to 2.2 mb FLVexport Movie to Flash Video
Flash 8 High Quality 700kbps
Video On2 VP6 at 700
Audio MPEG layer III MP3 at 128kbps stereo converts to 3.1 mb FLVThanks
Andy
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Daniel Low
November 8, 2009 at 9:57 amI thought you said the 400kbs clip had a bigger file size?
__________________________________________________________________
“There’s no chance that the iPhone is going to get any significant market share. No chance.”
Steve Ballmer To USA Today: 30 April 2007“We and Apple are neck and neck and we’re chasing the two
other players,”
Steve Ballmer, referring to Nokia and Research in Motion. October 6th 2009 -
Chris Blair
November 8, 2009 at 5:11 pmHere are some past threads with great links to information about encoding:
https://forums.creativecow.net/readpost/20/863282
https://forums.creativecow.net/thread/20/863293#863294
If you do further google searches you can likely find even more info, although those two links provide pages of information from some of the most knowledgeable people in the insdustry. You could also do a search for onine articles by a guy named Jan Ozer, who conducts all sorts of tests on codecs and encoding software, and writes and lectures about it extensively.
But….even after reading all of that…(and I have several times over), you’ll still occasionally end up having to experiment with settings depending on your source material and it’s codec/format. There are literally thousands of format/codec combinations out there and each one has its own quirks, which makes it dicey to apply them globally to all video sources. Generally, the higher quality and resolution your source footage is, the better your compressed footage is going to look.
Chris Blair
Magnetic Image, Inc.
Evansville, IN
http://www.videomi.com -
Andrew Crittenden
November 8, 2009 at 11:20 pmyes, i inadvertently flopped the two.
It’s not a huge difference, but still….Andy
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Daniel Low
November 8, 2009 at 11:53 pmWhat are you using to to the compression step for you?
__________________________________________________________________
“There’s no chance that the iPhone is going to get any significant market share. No chance.”
Steve Ballmer To USA Today: 30 April 2007“We and Apple are neck and neck and we’re chasing the two
other players,”
Steve Ballmer, referring to Nokia and Research in Motion. October 6th 2009 -
Andrew Crittenden
November 8, 2009 at 11:59 pmNot sure what you are looking for. Taking a641 mb QT movie > File > Export > Movie to FLV
My computer specs follow:
Model Name: Mac Pro Mac OSX version 10.5.8 Memory 6GB 1066 MHz DDR3
Model Identifier: MacPro4,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 2.26 GHz
Number Of Processors: 2
Total Number Of Cores: 8
L2 Cache (per core): 256 KB
L3 Cache (per processor): 8 MB
Memory: 6 GB
Processor Interconnect Speed: 5.86 GT/s
Boot ROM Version: MP41.0081.B04
SMC Version (system): 1.39f5
SMC Version (processor tray): 1.39f5Andy
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Daniel Low
November 9, 2009 at 12:04 amQuicktime is crap at doing any kind of encoding. You really need to use dedicated software like Apple compressor or Telestream Episode. You’ll never get consistent results exporting from QT player.
__________________________________________________________________
“There’s no chance that the iPhone is going to get any significant market share. No chance.”
Steve Ballmer To USA Today: 30 April 2007“We and Apple are neck and neck and we’re chasing the two
other players,”
Steve Ballmer, referring to Nokia and Research in Motion. October 6th 2009
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