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Forum nameThe Computer Forum
Topic subjectRE: file compression
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566085, RE: file compression
Posted by therube, Mon Jul-29-19 04:01 PM
A lossless compressor will compress an item & should be able to restore it - exactly as it was.

That said, a lossless compressor is generally not very effective (as in very little to no file size savings) on "video" (say a .flv or mp4) or a "picture" (say a .jpg or .png).

Video or images can be transcoded into other formats or with other constraints that may result in smaller file sizes, but will always result in quality loss compared to the original.

And that type of operation is typically time consuming (often quite time consuming), though can be of benefit if you're OK with the time & the quality loss. (Similarly some video, generally shot at very high quality, can be made quite a bit smaller, with quite acceptable quality loss. Some video, simply has a higher bitrate only so that it can claim to be "HD" or some such meaning tag (where in actuality, the video is no better quality then a "360" or "480" of the same clip.)

There is no magic bullet to that kind of thing, & often needs experimentation.