And why there are some 4-5 GB size blu ray movies available for download? If both the 50GB and 5GB versions are 1080p, what has been lost due to compression? Will there be a huge difference to visual & audio?
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EDIT: Thanks everyone, now I have a new found perspective on quality.
In: Technology
The other top comment has done a good job of explaining how two different sized movies can have the same number of pixels in the frame, but not touched on why the publisher might choose to make the movie file smaller.
There are a few different reasons this might be the case:
* If you have a lot of special features (interviews, making of’s, different audio tracks, etc) on the disc in addition to the movie, then the movie itself needs to be smaller. Lots of blu-ray releases have two different cuts of the movie (theatrical and director’s), which basically halves the potential size of each one.
* Depending on the source of the movie itself, the publisher might be limited in terms of what’s even available. For example, if you want to release a newly restored version of a classic movie that you didn’t restore yourself, then you might find that the company that did the restoration has (for whatever reasons) only produced a copy at a certain size/resolution.
* Some publishers are just lazy. You often see complaints about blu-ray releases on specialist sites (such as DVD Beaver) that they didn’t bother to fill up the disc, and that the picture quality suffers as a result.
No doubt there are other reasons, but I suspect these are three of the biggest.
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