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Activity Forums Compression Techniques Compression Confusion

  • Compression Confusion

    Posted by Andrew Crittenden on November 7, 2009 at 6:29 am

    Is 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
  • Daniel Low

    November 7, 2009 at 9:47 am

    Are 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

  • Andrew Crittenden

    November 7, 2009 at 9:36 pm

    Yes exact same video…

    Andy

  • Daniel Low

    November 7, 2009 at 9:44 pm

    Please 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 am

    Original File:
    QT Movie 641.8 mb
    Dimension 1280 x 720
    Codecs Animation, Integer
    Duration 00:27
    Total bit rate: 196,072

    export 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 FLV

    export 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 FLV

    Thanks

    Andy

  • Daniel Low

    November 8, 2009 at 9:57 am

    I 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 pm

    Here 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 pm

    yes, i inadvertently flopped the two.
    It’s not a huge difference, but still….

    Andy

  • Daniel Low

    November 8, 2009 at 11:53 pm

    What 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 pm

    Not 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): 1.39f5

    Andy

  • Daniel Low

    November 9, 2009 at 12:04 am

    Quicktime 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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