Can I export other file extension on stereo panoramic movie capture?

Hi, I’m using stereo panoramic movie capture, but it make alpha channel when i export image sequence.
I want remove alpha channel or change file extension, but i can’t figure out how do that.

ps)I follow on this article: Capturing Stereoscopic 360 Screenshots and Movies from Unreal Engine 4 - Unreal Engine

For everyone running into this issue:

I was looking into the same problem and I found that this is working. you can automate it with actions in photoshop.

In the Layers panel, select the layer.
Choose Layer > Layer Mask > From Transparency.

You see a layer mask thumbnail that is linked to the original layer. You can Shift-click on the thumbnail to disable it and make the image and its channels opaque.

Clicking the thumbnail again reenables it.

Cheers!