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Resolution Problem

Discussion in 'MPEG-1 and MPEG-2 encoding (AVI to DVD)' started by matlamont, Sep 22, 2007.

  1. matlamont

    matlamont Member

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    Hi, im converting a avi file to PAL dvd Using mainconcept.

    The resolution of the avi is 800 x 432.

    I use a bitrate calculator to determing the correct resolution for the dvd. It says, resize to 720 x 415 then expand frame and letterbox to 720 x 576.

    I input this to mainconcept and look at it on the preview screen and its not right so, i cropped 80 off either side in mainconcept to get it right but im not sure if this is correct?



    Thanks in advance
     
  2. MysticE

    MysticE Active member

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    I've found MC's preview window to be almost useless. Let it convert a little then stop the conversion and open the new file in your media player to view it.

    Your source appears to be 1.85:1.

    If you choose not to set the height to 415 in MC you'll need some adjustments. Setting MC to 415 and 4:3 should produce correct AR with bars top and bottom. Setting MC to 16:9 and leaving the height at 576 will produce a WS vid (no bars) that will be very slightly off. A 12 trim on both sides should correct it. Or if you want all the video you can set the height in MC to 552 (576-24=552) which will give you very small bars which are found on 1:85 vids.

    It sounds like you are setting MC for 4:3 at 576. Your WS source is being converted to FS in MC, if trimming off the sides makes it look right. Assuming your source to be 1.85:1, your 80 side trims sound about right for FS (4:3).

    I can show you some rather convoluted math on how 80 and 12 work.

    You should always convert to 16:9 regardless of what TV you have, unless black bars bother you, as proper AR will then be maintained on both 4:3 and 16:9 sets.
     
  3. matlamont

    matlamont Member

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    Thanks Mystice, i trimmed 80 off and it did the trick.

    I would appriciate if you showed me how 80 and 12 work

    thanks mat
     

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