ScreenFlow User Guide | Exporting — Codec Settings
| Editing the Codecs Although ScreenFlow ships with some very common codec presets, it supports any codec that QuickTime provides. It is beyond the scope of this documentation to describe all of the codec settings. However, here is a brief description of the QuickTime movie settings dialog. This dialog will be presented when you press the “Customize…” button in the Export Dialog: Video If you want your exported movie to contain any video, then check this checkbox. Settings… Pressing this button will allow you to change the video codec and its various settings. Each codec can have its own very large set of options, controlling framerate, bitrates, quality, etc. Filter… Can be used to add effects such as Sharpen, Sepia, Gamma (Adjust) and others. Using filters will increase the time it takes for ScreenFlow to render the final movie. Size… Although you can configure the size in the codec itself, we strongly recommend that you keep the default setting of “Current”. Use the “Dimensions:” of the Export Dialog itself to modify the resulting size of the movie. Resizing will increase the time it takes for ScreenFlow to render the final movie. Sound If you want your exported movie to contain any audible sound, then check this checkbox. Unchecking this box is a very easy way to reduce output size for screencasts without narration. Settings… Pressing this button will allow you to change the audio codec and its various settings. Each codec can have its own very large set of options, controlling framerate, bitrates, quality, etc. Prepare for Internet Streaming There are several ways you can export your movie for use on the internet: Fast Start Allows your movie to begin playing before the movie has finished downloading. This is the most common option to use. Fast Start—Compressed Header Same as the Fast Start option, but compresses the header of the file. Some older versions of QuickTime do not support this option, and therefore some users may not be able to view this format. Hinted Streaming Use this option if the video will be hosted on a QuickTime Streaming Server (QTSS). This option adds “hint tracks” which allow QTSS to stream the movie.