As part of acheiving its tremendous performance, Screenflick records movies to a custom "intermediate" file format. To create a movie file you can view on the web or share with someone (.mp4, .mov, .webm, .gif or any other format), the recording must be exported from Screenflick.
In the movies view, your previously recorded movies are displayed on the list of the left side of the window. After selecting the movie, you can add metadata to the movie (copyright, description, etc which will be used in formats that can use it), choose your keyboard and mouse visualization options, audio delay, timelapse settings, etc, and then click on the "Export…" button at the bottom of the window.
In the sidebar of the export panel that is displayed, several options for file formats are shown. You can even select a format and customize the settings, then save it as a preset for later use.
MPEG-4 (.mp4) files are the most common movie file format currently in use. Use this option for any purpose.
Choose the "YouTube" exporter in the export panel to export a video suitable for uploading to YouTube.
Choose the "Vimeo" exporter in the export panel to export a video suitable for uploading to Vimeo.
Choose the "ProRes" exporter in the export panel to export a super high quality intermediate video in Apple's ProRes format. The video file will be very large and is only suitable for importing into a video editor such as Adobe Premiere and Apple's Final Cut. The audio in the movie is all exported as uncompressed linear PCM to preserve the full quality.
HTML5 web video supports either .mp4 files or .webm files encoded with the VP8 and VP9 codecs. The "Prioritize Speed over Quality" option is a hint to Screenflick to export the file as quickly as possible, while sacrificing some amount of quality.
Sometimes a good old-fashioned .gif file is just what you need.
Because you may often export movies with the same quality settings, you can save the settings as export "presets" which you can recall any time you export. To save the currently selected settings as a preset, select "Save as Preset…" from the Preset menu. The next time you want to use the preset, just select it from the pulldown menu.
Click on the Quick Test button to use the current settings to export a short section of the recording (instead of the entire thing) so that you can verify visual quality settings are to your liking.
Some terms used in video and audio compression can be confusing. Read about them here to learn how to make the best use of these settings.
As a general recommendation, if you're unsure which settings to use, you can stick to H.264 video compression with High quality, multipass turned on, and AAC Stereo at 44.1KHz 128 kbps.