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PTE vs VIDEO - Size of output file


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I made an 8 second Timelapse sequence made from about 200 images of the clouds forming over a mountain over a couple of hours with a shot being taken every 10 secs.

All images were scaled down to 720 pixels in width to fit the standard DVD format.

I then went into PTE and made an exe show displaying each image for 40ms (this gave me 25 frames per second - the same as PAL DVD film rate)

The result was an 8 sec smooth Timelapse of clouds scurrying over a mountain top.

Now this is the part I can't understand.

My PTE exe file is about 8MB which is the around the same size as all the images put together.

But when I made an uncompressed AVI file in a Video Editor the resulting size was 222 MB!!!

How can a video file be bigger than the total of the images being used in the video? especially when one image is one frame.

Any ideas as to why this happens?

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