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Hi Gary, All smartphones and cameras use hardware video encoders which should work in real time, and this applies certain limitations. To reach the best visual quality (less artefacts) these encoders set the highest bitrate (about 100 MBit for 4K videos). And this high bitrate is used for any kind of scenes - with many fine details (trees), or for scenes with less details (sky, snow, walls, etc). Software video encoders have more time for more effective use of bitrate. PTE AV Studio uses the newest smart mode of a video encoder which dynamically changes a bitrate according details in a video scene for each frame. It works like a JPEG compression in Photoshop where you set say "10" of compression quality and resulting JPEG file has different file size according pixel size and fine details in a picture. In other words, "High quality" preset (100%) in PTE gives a similar result as using "10" in Photoshop for saving JPEG. Try to create a new simple project with blank images and one text caption on each picture. No transitions (quality transition) for each slide. Encode a MP4 video in PTE with 1920 x 1080, High quality, 60p. I guess that you'll get a MP4 video file about 300-500 KB (less than 1 MB). Then replace blank images with JPEG pictures of landscapes/flows/trees and the resulting MP4 video will be about 10-20 MB. Add Dissolve transitions or any Pan/Zoom animations and MP4 file will be 30-50 MB. Then add videos, and file size will be 50-150 MB.