How so small?

A

apple1rule

I have a question, comparing between 'professional' movies, and home made movies. My question is that when I go to download a featured movie, any movie around 1 and a half hours long, it is usually around 2 or 3 gigabytes. However, when ever I shoot a movie in my house, at HD 1080p, after just 10 minutes of shooting my 2 gigabytes become full. That means a 1 hour movie I shoot will be 12 gigabytes. How come thebig-screen movies are considerably less in size, than mine? :)

Thanks!
 
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Compression.

Your own 1080p HD is less compressed than a 1080p movie that you download. Downloadable files are encoded to be smaller to conserve bandwidth. For example, an AVCHD clip fresh from your camera will be significantly larger than if you export an H.264 version of the same clip from your editing software. But the much smaller H.264 version will also not look as good as the original version, and may have a smaller color palette, a narrower contrast range, and have compression artifacts not present in the source. So the trade off for smaller files is lower quality.
 
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