Generally, there are three common ways to reduce video file size: change video frame rate, resolution and bitrate cut unnecessary video clips and convert it to a flash video file.
Shrink Video File Size without reducing quality At least, we cannot visually discern any difference between the original and resulted file. What we can do is to make the compressed file close to the original file to the fullest extent. And discarding data means lowering quality and resolution.
Whatever the reason is, there is no such thing as lossless compression by definition. Large file size is really a big headache to people who want to send videos to someone via e-mail, or those who would like to upload videos to sharing sites like YouTube or Facebook or for the sake of saving device capacity.
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