Merging 2 gifs, one is animated and transparent

[av01d]

Reviving an old thread... I have a question similar to what was asked above.
I have a JPEG image of say 400x300px. I have a small animated GIF of say 100x50px.
I want to overlay the animated GIF over the JPG, which should result in an animated GIF. The GIF should have the same width/height as the JPEG image (400x300px in this particular example).

I tried:

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convert smallAnim.gif -coalesce -draw "image DstOver 0,0 0,0 background.jpg" -layers Optimize output.gif

Which is close to what I want: output.gif shows the animation (smallAnim.gif) over the background image (background.jpg), and it animates correctly, but the resulting image has the width/height of smallAnim.gif. It's too small.

When I want to position the animation to a certain x,y coordinate:

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convert smallAnim.gif -coalesce -draw "image DstOver 150,125 0,0 background.jpg" -layers Optimize output.gif

It gets worse; output.gif only shows the animation, the background image is not visible.

How can I make this work properly, without reverting to merging the images frame-by-frame (which works, but is cumbersome).

[snibgo]

Testing and suggesting a solution is far easier if you supply sample input files. You should also say what version IM you use, on what platform.

The problem is that IM uses the first input as metadata (including dimensions) for the output. You might use a dummy first input:

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convert background.jpg smallAnim.gif -delete 0 -coalesce -draw \"image DstOver 0,0 0,0 background.jpg\" -layers Optimize output.gif

[anthony]

This is covered by IM Examples!

[av01d]

I managed to figure it out myself:

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convert background.jpg null: \( smallAnim.gif -coalesce \) -geometry +150+125 -layers Composite -layers Optimize output.gif

Works like a charm. Is this indeed what I should be using?

The suggestion made by snibgo (thanks!) does not seem to work for me...

[anthony]

Yes... as per...
http://www.imagemagick.org/Usage/anim_mods/#background