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Rendering quicktime / pixelated photos
I am putting together a show which contains some video (delivered as mpeg 2) and some photos. It needs to be rendered as quicktime as the show-control is on a macbook pro running qlab driving three projectors @ 800 x 600.
I place the photos on the timeline and have a one second fade in at the start, then a 1 second fade out at the end.
The problem I have is that as the photos fade-in they pixelate during the fade. Fade-out is fine – only fade-in has the problem. I thought it might have been to do with the size/resolution (I originally dropped the 3264 x 2448 @ 72dpi, 24 bits onto the timeline) so I reduced them to 800 x 600 (the project dimensions – but still exactly the same. I also tried both a png and a jpeg version of the photo (png created using paint.net from the original jpeg)
I rendered the quicktime file @ 5mbs
Would it be to do with the 72 DPI? It seems a bit low? Interestingly when I render as MPEG2 they fade in perfectly. I did try viewing the .mov file on quicktime viewer on both the PC and a Macbook pro. I also tried viewing the file in VLC – same results.
Would anybody know if I should be preparing the stills in a specific way, or is this just another of the QT-related issues?
Thank you.
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3 Replies
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What QuickTime template did you use? If you made your own template, what codec did you use? Try using Motion JPEG B, Photo JPEG, or PNG.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
Ok, that worked.. PNG – perfect fades and really clear picture…
I clearly have a lot to learn… I thought PNG was only for still images – does this mean that the .MOV file contains a sequence of still PNG images, each one representing a full frame?
I noticed also that when I select PNG I cannot set the bitrate? Does this mean that each image is a full-res PNG resized to the resolution of the project? If this is the case, how is the bitrate for the video events in the project determined?
Thank you
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[Stewart Bourke] “I clearly have a lot to learn… I thought PNG was only for still images – does this mean that the .MOV file contains a sequence of still PNG images, each one representing a full frame? “
Yes, the video is made up of PNG images which is why you get such high quality.
[Stewart Bourke] “I noticed also that when I select PNG I cannot set the bitrate? Does this mean that each image is a full-res PNG resized to the resolution of the project? If this is the case, how is the bitrate for the video events in the project determined? “
The bit-rate is fixed. This is designed for very high quality transfers. You can get a smaller file by using Photo-JPEG which uses slightly more compression and JPEG encoding for a smaller file size.
~jr
http://www.johnrofrano.com
http://www.vasst.com
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