Hello,
You may try to adjust your Debut settings to match the following:
1-Select .avi from the Record Screen as: drop-down under the preview screen
2-Click the Encoder Options.... button
3-In the AVI Encoding Settings window, change your settings to the following:
*Video Compressor: H264 (Native)
-CompressionSettings...
*Set the Quality (Rate factor): to 10.0(High quality)
*Sound Compressor: MP3(Native)
*Sound Format: 44100Hz,320kbps, Stereo
4-Click the OK button to save your settings
Regards.