I have an animation I've exported from Flash Pro CS6 as a MOV file with an alpha channel (ignore stage), and I want to do some editing in AE CS6. When I go to import the MOV as Strait-Unmatted, I do get a transparent background, however when I scrub the playhead with transparency grid toggled, a black background appears behind my animation.

I've tried a number of methods found here and elsewhere on the web including keying out black with luma key, but results were undesirable. Is there a way to get rid of the black behind my animation in AE without effecting the rest of my animation? Or is there an export setting I'm missing in Flash Pro?

4 Answers 4


Seeing as this appears to be a bug, my only suggestion is to export it as a PNG sequence. At my work we always transfer from Flash to AE as a PNG sequence, as we find MOV notoriously unreliable and buggy.

If you need to retain an audio track, try exporting that separately as a WAV or MP3 and placing it on your timeline in AE.


Sometimes you can pick number of colors for output like 256, if the option doesn't have a + symbol after it, it doesn't actually output the matte properly.
Or at least I've had a similar problem when outputting stuff with a trasnparency in AE


In AFX import MOV with options: "Premultiplied - Matted with color" and select black or white color


The only success I've had in AE with regard to rendering a video that has a transparent background is to render it as an FLV file. The other outputs I tried (various MPEGs, MOV, AVI) always pulled a background into the export regardless of the fact I had the transparent background toggle on. (Reminder: also render as RGB+Alpha).

There should be a toggle button to click as to whether or not you want the original video to be in the background of an effect or on top.

With regard to creating a PNG sequence, you'll end up with a PNG image for every frame in your sequence......just sayin' I tried it once.....but only once......I ended up with THOUSANDS of PNG images. I deleted them all and started over because there was no way I was going to assemble all of those. augh!)

  • Assembling a PNG sequence in AE is very straightforward, though - it is often the simplest way.
    – Dr Mayhem
    Commented Feb 17, 2015 at 8:37

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