After working with Camtasia studio for a period of time, recording the video format Trec, in "Generate and share", there are many conversion formats, but after trying, click on the effect and size of the perfect control:
1, first, in the adjustment of the video "edit Size" to 1080p, do not use the default 720p
2. Second, after the "Generate and Share" selection, select "Custom Build Settings" and select "recommended" that is MP4, then continue by default.
Of course, in the next step there is a "video" tab, you want to ensure that the video size is really your best resolution size. As for the quality of the compression ratio of 50% on the line, 70% will be compressed after the size will be larger and the quality of the small increase, no difference.
Last try, the video 128M Trec, can be compressed into 22.9M MP4 format, and very clear.
Camtasia Studio Recording video format TREC compression release best practices