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![]() ![]() Thus it will use the same amount of data regardless of the content even if your screen recording has no sound, it's still going to save 5hrs * 44.1 thousand zeros. High, will be a H.264 compression at approx 20Mbit/sec, this is a reasonable data rate for compressing HD video with good quality. ProRes, is a close-to-uncompressed algorithm that is optimised for editing video (computationally light to decompress and scrub through at the cost of lots of disk space). IMovie is optimised for working with video, not screen recordings, so the output options are tuned with that in mind. This efficiency is due to h.264 and that, unlike regular video footage, in screen recordings not much is typically changing between frames. ![]() This is extremely efficient compression! (for comparison, standard definition DVDs rarely pack more than 4hrs of video onto 7GB of space). If you have ~5hrs of video in 4.73GB of data, that must be encoded at ~2.1Mbit per second. But your project is computer / hardrive independent and you can move it around anywhere freely. iMovie HD stores all the movie data within the project file, so they become quite large and you can't have a duplicate project without taking up much more space. It is designed to store video using the least possible amount of data at the cost of using a lot of CPU time to encode or decode. iMovieHD can use any type of external drives, USB or Firewire. Eventually it will contain all the video clips, transitions, effects, and audio used in y our. A new project file for your iMovie HD project is created in the location you chose. Click the pop-up menu labeled Where and choose a folder to store your movie. H.264 is a codec optimised for distribution of video. Apple-designed movie themes: iMovie HD 6 makes it easier than ever to add. The screen recording you made with Quicktime was initially saved using the extremely efficient H.264 compression algorithm. You have inadvertently wandered into the murky realm of video codecs. ![]()
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