On the other hand, in the "New Screen Recording" mode, recording the entire monitor screen display area uses up your storage space much faster than making a recording of a partial screen area of the monitor. I.e., for any given set of display dimensions, the "High" quality mode encodes your recording using H.264 video with Low Complexity AAC audio which is more "space" efficient than the "Maximum" quality settings which encodes as Apple ProRes 422 video with LPCM audio. For instance, in the "New Movie Recording" mode, the "Quality" setting can greatly change how long you can record. ![]() So anything that affects a change in the data rate of your recording will affect "how long" you can record. This is determined by the combined total data rate of the recording. The next consideration is the rate at which storage space is being consumed by the recording. ![]() Since current MacOS versions (Mavericks thru Sierra) store the "scratch" video data on your startup drive (internal or external), the amount of storage space available on this drive will determine your "how long" recording baseline. To be a bit more specific-it depends on the amount of storage space available, how fast you are filling up the available storage space and assumes nothing occurs to prematurely terminate the recording process. ![]() How long a video can i record in this version of Quicktime (10.4)?
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