This task refines the video capturing dialog that has been worked on during previous tasks.

The following behavior should be accomplished:

Once the "Start Recording" button is pressed a dialog should appear.

This dialog displays some means to choose the file name of the mpeg video (or the directory where the frames should end up). If a video is created the temporary frames should get saved in a temporary folder.

The dialog should offer some commonly used fileformats that are supported by the ffmpeg/avconf version installed.

The dialog should offer to change the framerate (no checking for reasonable speed yet).