Hi Robrowald
I think I might understand what is happening.
When you preview a file in the Media Browser, you will view the file in the quality it was created in. When a video is brought into the Mixing Screen for editing and mixing, we display the video in a 320x240 resolution for maximum PC performance. This is in order for users with any spec machines to be able to mix very large files (both resolution and frame rate) comfortably. When you export your file to MP4 H.264 level 4 or 5, you will notice that the quality of the file will be superb and very little quality has been lost.
I presume the video looks small because you have the Stretch to Video Frame button turned off the video output window. (see screenshot)
If you turn off this button you will see the video in the clear 320x240 resolution. It will look small but clear.
Another option is view your video in 640 x 480 or higher in the Mixing Screen..
You can do this by clicking on: Options/ Mixer Configuration ( see screenshot)
and in video mixing engine performance area: Select Medium or Low Performance:
NOTE: this option will require a reboot of the application and it will re-parse all the media that you are using. Also if you do not have high spec machine it might effect the playing of your video mix in the mixing screen. So generally it not really recommended but the option is there
I hope this helps please do not hesitate to contact me with any questions on this.
Best regards
Cormac