The issue with recoding Snagit sessions, is it puts the audio on two tracks and when uploading it to YouTube, the audio disappears. Use VLC to see how the audio would play. Using QuickTime to convert the video. iMove does the same thing too, but it takes lots of resources as it imports media into it's library.
Steps to Process with QuickTime 7
- Open Movie with Quicktime, and you are going to export the MP4 movies as a Quicktime MOV file instead. Other formats seem to lose quite a bit of quality
- Audio Channels: Mono
- Compression Typ: H.264 with Best quality (Multi-pass)
Steps to Process with iMovie
- Combine and export audio traces of MP4 Snagit Movie with Audacity
- Open media for both movie and audio, edit movie clip and drop audio
- Add audio track and export the entire movie
- Delete all off the media files and empty trash