If you used Livestream Studio to record and the AVI file does not play back in other software, Studio may be able to recover the file via the built-in transcoder in the Media bin.
To repair your AVI file, navigate to either Media tab in Livestream Studio and import your AVI file. If the file transcodes and plays back in the Media bin, then Studio was able to recover it. After doing so, export the file to your hard drive.
We have seen this method work in cases where Studio crashed during the recording and the AVI file left over was corrupt and unplayable.