file size puzzle

[ctoz]

Hi, first-timer, old'n'slow... with the free version. I'll love it when I get the hang of it.

Never done video, but have some experience with image compression for web, and with html.

 

The objective is to make a short sequence which, when embedded in a webpage, will play automatically as a loop.

 

Starting from a video, .mp4 : using Quicktime, it's trimmed down and saved in the only format option available: .mov: it's 25 seconds duration, size 1.2MB.

 

To get a smooth transition from the end back to the start (very different frames), I've made a sequence in Videopad by repeating the clip with a 3-second crossfade: it's now 47 seconds duration.

 

Next, I trimmed this down so that the loop ends and starts on sequential frames in the action: back to 25 seconds duration.

 

In the Export Video options to save it, the option presented is 768x576: check, yes, same aspect ratio as original, so I use that. Result is a .mov file, 25 seconds duration, size 5MB.

 

I don't get it. I've been working in the same format all the way through, but the finished file is four times the size of what I started with. Can anyone explain?

[Nationalsolo]

Hi

 

Your original clip may have had the same aspect ratio as the out video, but was it the same size in pixels?

 

If you inputted at 640 x 480 pixels (AR 1.33) and then outputted the same length of clip at 768 x 576 (AR also 1.33)

then the file will be larger. (and be about 4x the size as each frame is 4X the area)

 

Try saving your output video to a smaller pixel size. In the Video Output Setup window, click the down arrow to the right of the resolution box and select a smaller format.

 

Nat