Images and Windows Movie Maker

re: Images and Windows Movie Maker

Rehan — Tue, 19 Apr 2005 14:24:49 GMT

Hi Dean,

Its good to see this covered here. I am not sure about 720x540 size you mentioned above. I think only 640x480 size will be able to avoid the resize operation.

This is based on the observation while debugging my custom plugins which seem to always get a frame of $:3 ratio, for both output sizes of 640x480 or dv avi 720x480. Note that: even when the output is DV AVI 720x480, the frame presented to the custom plugins is 640x480.

Fromthis I gather that there are two resize operations involved. One that happens at the very begininng in the pipeline to make input to be same size as output. The other resize is done by the encoder at the final encoding stage due to the profile used. I think the reason for the first resize is to avoid any resizing to happen at the encoding stage.

So when input=640x480 and output=320x240 => only first resize would happen.

when input=640x480 and output=720x480 => first resize won't happen but the encoder would resize using non-square pixel encoding to fit the frame to 720x480.

When input=640x480 and output=640x480 => no resize would happen

When input=720x540 and output=720x480 => both resizes happen: first makes the frame fit 640x480 with black borders, present this to the custom plugins and then the encoder finally stretches the output to 720x480.

Therefore I would argue that to avoid any resize of still images one must use input images of size 640x480 and a WMV prfile for output with size 640x480.

Which makes DV AVI to be not suitable as the profile to be used for outputting a still slideshow as it would always cause the second resize operation.

Comment please?

re: Images and Windows Movie Maker

Rehan — Tue, 19 Apr 2005 14:28:28 GMT

Please read "$:3" to be "4:3"
and
"with black borders" to be "without black borders" in

...
When input=720x540 and output=720x480 => both resizes happen: first makes the frame fit 640x480 WITHOUT black borders, present this to the custom plugins and then the encoder finally stretches the output to 720x480.
...

re: Images and Windows Movie Maker

Dean Rowe — Thu, 21 Apr 2005 19:39:49 GMT

Thanks for the comments Rehan, I'll check into the multiple resizes with plugins and report back.
Cheers
Dean.

re: Images and Windows Movie Maker

amanapart — Tue, 26 Apr 2005 22:46:03 GMT

I think I followed your instructions, and I certainly ended up with a very small .wmv file.

However, when I try and import (as video) this into Win Movie Maker I end up with a .5 sec clip. How do I get it to sustain for 3-4 secs?

re: Images and Windows Movie Maker

deanro — Wed, 27 Apr 2005 07:59:52 GMT

An excellent point :-). My original instructions only created a video file that was one frame long, which isn't that useful if you want to use it on the timeline. I've now updated the instructions so it will create a video file for as long as you need. Hopefully this will be a little more useful. See [New section Apr 26th 04] in the entry.
Cheers
Dean.

Image sizes and non-square pixels

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