I have checked our email, but sorry for that we have not received your swf file until now. Could you please have a check?
1. Referring the issue about the video is not converted completely, please go to Conversion Parameters wizard page, and check whether you have checked "Auto and caputre after" box under Caputer settings box. If you have, please uncheck it to solve this problem.
2. And "Stereo Mix" options, have you checked the following steps provided on our website?
You can double-click "Volume" icon on Windows Taskbar to open the Volume/Recording Control panel. Please choose Options>Properties, and check "Recording" under "Adjust volume for", then you will find "Stereo Mix" funtion under "Show the following volume controls". Please enable it and click OK to confirm it.
If you still can not find "Stereo Mix" option according the above steps, you can choose "Midi" to record dound if you are a use of Sound blaster. Hope that helps.
If we can be further help, please feel free to contact us.
Have a nice day.