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"On the fly" encoding

Discussion in 'Video capturing from analog sources' started by Al1970, Jan 19, 2005.

  1. Al1970

    Al1970 Member

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    Hello Minion,

    Thanks for all your contributions in this forum…
    I have two questions that you may have some answers on.

    1-Is it possible to create good quality divx “on the fly” from a winfast 2000 expert card and the original winfast PVR software ?
    My computer is a athlon 2600 slightly overclocked, 512megs ram DDR 400 running 360Mhz, 80goHDD 7200rpm.
    My experience on this is bad : Divx5.2 codec gives blurry and freezing images as well as microsoft mpg4v3 codec. Xvid is the best codec that gives excellent quality on slow motion movies but getting blurry (squares) with any fast motion in the movie. While encoding with Xvid the %of UC used oscilate from 65 to 90%.

    2- Is there a simple program that allows to encode in mpeg2 “on the fly” and that always create by itself 4.7Go file. I mean whatever the length of the programmed recording that adapts automatiquely the encoding parameters so that the final files fits perfectly in an empty DVDR ?

    Thanks.
    Alex from France :)
     
  2. Minion

    Minion Senior member

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    Hi Alex, It is Hard to capture good Quality Mpeg-4/divX/XviD because the Codec works Best when it is allowed to make at least one Pass over the Video to analize it"s Complexity and detect scene Changes and when captureing the Codec doesn"t get to do that Analizeing pass so it has to predict what the video Complexity is which is a very Inefficient way for the codecs to encode so you will get Blurry and Blocky Frames especially in high motion Scenes ..
    Pluss these codecs need a lot of CPU to encode and it is Difficult for most PC"s to encode at Full resolution in real time without dropping frames....

    And no there is No software that will Make the captured File under 4.3gb no matter the Length of the Movie..It would be Impossible to do so because there is no way for the Software to know How long the Movie is going to be...
    What you need is a Bitrate Calculator which will tell you what bitrate to use based on the Length of the Movie you are Encodeing/Captureing , Then you will never have a problem with captured Files being too large for a DVD....

    Cheers
     
  3. Al1970

    Al1970 Member

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    Minion,
    Thanks for your time & knowledge.

    Must I conclude that there is no way to obtain a good quality Mpeg4 or Mpeg2 file in real time encoding ?

    I tried "AVI no compression" (to be able to encode the files after capure in 2 passes) but the file obtained are so big that I got freezing of the movie when the ram transfers data to the HDD...

    Alex from France :-(
     
  4. Minion

    Minion Senior member

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    You shouldn"t have any problems captureing to Mpeg-2 with good Quality as long as you use a Good Mpeg-2 capture program and have a fast enough PC....

    The Mpeg-2 Capture Programs I have had good Luck with are "Intervideo WinDVR 3.0" and "Sonic MyDVD Studio 6" both of Which captured Good Quality.....

    If you want to capture Good Quality AVI files then Try the HuffYUV Lossless Codec as it Produces Quality as good as Uncompressed AVI but uses Half the Disk space....

    Cheers
     

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