What's causing the squares?

Discussion in 'DivX / XviD' started by InitialX, Aug 14, 2006.

  1. InitialX

    InitialX Member

    Joined:
    Jun 28, 2006
    Messages:
    18
    Likes Received:
    0
    Trophy Points:
    11
    The video starts at a pretty good quality, but at the end scene where the boat is speeding across waters, quality starts to lose and causes all these squares.

    Picture: http://www.stickied.net/files/c9c50cf6b3782dc08c7b2e0dc6621d9b.png

    Am I encoding it bad is it something to do with my graphic card? Playing the original dvd works fine.

    I'm using xvid and virtualdub mod for creating the avi. In virtual dub mod, I've set the filter mode to bicubic (A=-0.75).

    Edit: I'm converting a dvd to avi.
     
    Last edited: Aug 14, 2006
  2. celtic_d

    celtic_d Regular member

    Joined:
    Jan 23, 2005
    Messages:
    3,352
    Likes Received:
    0
    Trophy Points:
    46
    You actually upsized to that resolution with black bars?

    Common practice to encode credits at a lower quality using zones, although I would hope that you would remember if you did that. Still a little more detail of your process might help. Like you are doing two passes? Also I wouldn't recommend using VDub to resize and if you are upsizing, I wouldn't recommend resizing at all. Encode at the original DVD resolution instead.
     
  3. InitialX

    InitialX Member

    Joined:
    Jun 28, 2006
    Messages:
    18
    Likes Received:
    0
    Trophy Points:
    11
    I'm using single-pass and resizing a 720x480 to 640x360. And I've cropped out the black bars.

    The picture you saw wasn't the actual size, i put it in full view.

    I've tried doing a 2-pass but it asks me for a statfile which I'm not sure about.
     
    Last edited: Aug 14, 2006
  4. celtic_d

    celtic_d Regular member

    Joined:
    Jan 23, 2005
    Messages:
    3,352
    Likes Received:
    0
    Trophy Points:
    46
    The stats file is created by the first pass and used in the second. You can't jump straight to the 2nd pass without doing the first first.

    I wouldn't recommend single pass unless you are encoding at a fixed quant.

    Also 640x360 is not mod16. Using non mod16 resolutions makes the codec less efficient.
     
    Last edited: Aug 15, 2006
  5. InitialX

    InitialX Member

    Joined:
    Jun 28, 2006
    Messages:
    18
    Likes Received:
    0
    Trophy Points:
    11
    what do you mean non mod16? what would be a correct size? is there a guide on this?
     

Share This Page