Previous 1 2 3 Next 37 Replies Latest reply: Aug 7, 2010 6:38 AM by Zak Ray Go to original post
  • Zak Ray Level 4 Level 4
    Your clip is 720x576, it's just being displayed otherwise due to (I'm assuming) unsquare pixels.

    Seeing as you're going to the web, Compressor is making the right call by converting to square pixels. So I would say that's not your issue.
  • Tom Wolsky Level 10 Level 10
    Mac OS X
    Right. Red herring. Case closed. It's 720 not 768 or 788.

    Incredibly difficult image to compress. I'm guessing these people aren't standing still much. High contrast. Lots of deep shadow area creating gradients in the blacks. You have to use a high data rate with this material. No way around that.
  • Roberto Ficarella1 Level 1 Level 1
    So I should export to 720 x 576, ok.
    Thank you all!
  • Zak Ray Level 4 Level 4
    No! No, no. 768x576 is what you should be exporting to.
  • Roberto Ficarella1 Level 1 Level 1
    I had to work on other things in the past days, today I re-opened the project to export it.
    I still can't understand how to set the correct export size.
    This is the compressor info pane:
    the settings is H264 for apple tv, and this is the geometry tab, but cannot put any % in the dimensions area, I can only edit the pixel aspect.
    Even If I chose other than "custom" in the drop-down menu in the "Source Inset" area, there is no way to set the exact dimensions.
    I could only export to 720x540, which is quite good, but, since the media quality is low, I would like to avoid any frame resizing!
    Thank you all.

    thrillcat editorial wrote:
    Duplicate the AppleTV preset. Select the new one, go to the Geometry tab and for Dimensions, select 100% of source. Save the preset and use that.

    Out of curiosity, what creates a 768x576 frame size?
  • Zak Ray Level 4 Level 4
    The problem is pixel aspect ratio. To re-iterate what we found earlier: 720x576 with rectangular pixels is what your video actually is, but your computer is displaying it as 768x576, since computers display things using square pixels. It's basically showing you a square-pixel version (because a computer display can't of course change the shape of it's pixels), but it's not actually changing it to square pixels. Just displaying it that way.

    Now for the web, you always want to have things in square pixels, so you actually DO want to CONVERT your finished video to square pixels. So in Compressor, you want to indicate 768x576, with a Pixel Aspect of 1.0. If Compressor isn't letting you do this, try clicking Save As and saving it as a new custom setting, then try again.

    If you think the resizing is lowering the quality, go to the Frame Controls tab, click the gear, turn them on, and change the Resize Filter to Better or Best.
  • Roberto Ficarella1 Level 1 Level 1
    Thanks for the reply.
    I saved the preset, but still cannot change the frame size width and height.
    I will need no resize filter if I don't resize the movie, and I don't want to resize it since it is already low quality
  • Zak Ray Level 4 Level 4
    Okay, you're not listening to me: you HAVE to resize the movie if you're going to the web, because you HAVE to convert it to square pixels.

    Now if you turn on frame controls, and change the resize filter, you won't lose any quality from resizing.

    Make sure you have the right setting selected when you're trying to change dimensions. When you saved it, it will have appeared as a custom setting. You should now be using that setting.
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