![]() ![]() The MPG files are compressed, and limited to 256 (8-bit) grayscales. Results are presented in two forms: MPG format movies, and stacks of TIF format images. Cropping the volume to this range decreases its size by a factor of 10. In run 'e', for example, visual inspection establishes that the track is contained in the volume range 362 < x < 428, 230 < y < 270, and the full range of z. ![]() These volumes were cropped to contain only the track, for convenience. The latter cannot be manipulated using IDL on a 32-bit operating system. Full volume files in NetCDF format are 425 MB for binned runs, and 3.4GB for unbinned runs. Results of reconstruction are 3D data volumes with 16-bit values for x-ray attenuation (white = higher attenuation) at each volume element (voxel). The resulting size is just a little higher that the originals, and there is no degradation in quality (keeping in mind that the movies are just slide shows with and audio track). This has the effect to convert the mp4 files to a lower bitrate (160kbps). Less compressed is better for quality and editing, and is desirable unless one intends to upload to the internet, or email it somewhere, or has storage space limitations.īut iMovie does not know that: it assumes I'm actually editing a real movie where the scene changes constantly, so it applies a reasonable bitrate, that essentially matches the 360p/480p internet movies. The likely answer is that your input video was very highly compressed and iMovie unpacked it for editing and rendered a less compressed version. The Medium or small options would give you a larger file, of course. I tried it and compressed a 47.8 mb video down to 1.7 mb using the small option. Regarding what options you have to make the file a smaller size, probably the easiest is to share it to Email instead of File, and under the Resolution options you will have options to make the video Small, Medium, or Large. Clear fluff from the front and the end as people fiddle with the presentation, insert a clean slide title at the front and a closing slide at the end. Last one: I need to edit some movies (conference recording, mostly slide shows with audio).
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