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  1. Hi,

    All I'm trying to do like most is improve the VCD quality without increasing filesize too much. I'm more concerned with increasing the VIDEO bitrate when needed, mainly during action scenes to get rid of any macro-blocks.

    I'll only mention the settings that aren't recognised as being STANDARD VCD (PAL):

    1. Rate Control Mode
    - Constant Quality (CQ) 100%
    - Min. bitrate = 350
    - Max. bitrate = 1650

    2. VBV Buffer size
    - 110 Kbs

    By selecting MPEG-1 VideoCD under System, does this tend to cancel out the CQ 100% 350/1650.

    Do flame me guys, I'm just curious and so far I'm pretty happy with the results, virtually NIL macroblocks, no blending problems and similar file size.


    ©.¸¸.·´¯`·.¸¸.·´¯`·.¸¸.·´¯`·-- KennyC --·´¯`·.¸¸.·´¯`·.¸¸.·´¯`·.¸¸.©



    <font size=-1>[ This Message was edited by: KennyC on 2001-12-21 02:06:18 ]</font>
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  2. Member adam's Avatar
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    Sep 2000
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    CQ works on a quality setting which basically translates to an allowable level of degragation. At %100 this tells the encoder to not allow any degragation if it can help it, which basically means using full bitrate allowed. At %100 you are in fact encoding in cbr at whatever your max bitrate setting is, in this case 1650kbits per sec. There is nothing wrong with this level of bitrate, though it is non-standard, however you could achieve the same results using cbr and lower your encoding time. If you want your settings to make more sense try using a lower quality setting like %60-%70.

    My understanding of the VBV buffer is that it sets the rate at which data is sent to the dvd player so that no overflows or underflows occur which can result in garbage on the screen. There is a formula for calculating the correct VBV buffer size and its something best left up to the encoder. If your setting is too low or too high the encoder should let you know. One thing I am sure of though is that tweaking the VBV buffer setting has no effect on quality unless you go too high or too low, which of course is bad. Basically the VBV setting is not something you need to mess with.
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  3. Hi,

    Thankz ADAM.
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