7/3/2023 0 Comments Exporting imovieThat decoding restores the original frames as if they were uncompressed, and then then applies your new export options. But when you export a clip, the software has to decode it and then re-encode. When QuickTime Player and other software plays back a video, it decodes the compression, and modern iOS and Mac (and other makers’) devices have built-in chips that handle that decompression for real-time playback, rather than handling it in software. ![]() The higher fidelity you want, the more tonal and motion variations are preserved, and the bigger the file. If a large area of an image or frame is more or less the same blue, with a high level of compression, it becomes all blue and takes just a few bytes to store. In compression, algorithms scan regions of an image or both regions of frames and differences between frames in video to find patterns or approximations. ![]() Rob then imported his file into iMovie, chose the lowest resolution of 540p, and got an estimate that the output file would be even bigger: 166.8MB! He asks, “Surely, there must be some catch I don’t know about…” This seems counterintuitive, but it comes from how video files are stored, played back, and export. Rob notes he exported his 720p file at 480p, and got a larger file in result. But the more significant issue here is what’s missing entirely: export options.
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