AVI is a popular video format developed by Microsoft. It can contain both audio and video data in a file container and thus realizes synchronous audio-with-video playback. AVI with alpha refers to AVI video with transparency, or in other words, you can do further editing on the converted AVI with Alpha, for example, you can edit whatever background you like to the output AVI video. It is a common word in Adobe Premiere. It is with the advantage of video blending. You can composite a video by blending a video and a video with alpha. The result will be that one video shows above the other without covering it.
Now I am going to tell you how to convert swf to avi with alpha channel and how to import it into Adobe Premiere for further editing.
Step1 Input SWF
Click the button of “Add”, you will see a popup window, and then choose a flash with transparent background to input it into the file list of Aunsoft SWF Converter.


Step2 Output Setting
To click the SWF file into AVI with Alpha, you need firstly choose corresponding profile.
And then locate a folder for the output video.


Step 3  Start Converting
Click on the button of “Convert” next to the profile box presenting in the file list.


Step 4 : Follow the onscreen instructions to finish the converting and you will get your desired AVI video with alpha.

With alpha AVI, you are free to edit the background, and customize the video whatever way you like.
Now let me tell you how to embed this transparent AVI to Adobe Premiere and customize your AVI video.
Step 1 Import AVI with Alpha into Adobe Premiere Pro
Step2 Import another regular video or image and add it onto the AVI with alpha as background.


I just found it not long ago. Aunsoft SWF Converter is a new program with powerful functions. It can convert SWF to AVI, AVI Alpha, MPEG, WMV, 3GPP, MOV, MP4, ASF, DV, TS, and VOB etc. This useful SWF to video converter can also convert SWF to iPod, iPhone, Zune, PS3, PSP, Zune, Xbox360, Creative Zen Player, Blackberry, iRiver, Dell Axim, Apple TV, etc.
Moreover, it supports single conversion and batch conversion.