user3890: I don't know if this is the correct place to ask this type of question, but here is it.
I wanted to find a ball park size of each blu-ray frame size in bytes. This is my calculation which cannot be correct.
Assuming we have a 2 hour blu-ray movie of size 25GB: 
(25 * 1024) / (2 * 3600) = 3.56 MB/s of data
Blu-ray's fps ranges from 25-59 fps: 
3.56 MB/s / 25 = 145 KB
That is around 145 KB for each 1910 x 1080 pixel picture?! I don't know what I'm doing wrong here...

user2836: What you are missing is that not every frame is stored as a picture.  A large number of frames are stored simply by keeping track of what changed from the previous picture.  If you think about most video, not a whole lot is actually changing since the majority of the scene stays the same or moves in a similar pattern.  By describing only the changes, the amount of space required can be reduced drastically.
This is why the actual data "per frame" can be so low since only a fraction of the frames are actually full frames.

3890: <p>I don't know if this is the correct place to ask this type of question, but here is it.
I wanted to find a ball park size of each blu-ray frame size in bytes. This is my calculation which cannot be correct.</p>

<p>Assuming we have a 2 hour blu-ray movie of size 25GB: </p>

<p><code>(25 * 1024) / (2 * 3600) = 3.56 MB/s of data</code></p>

<p>Blu-ray's fps ranges from 25-59 fps: </p>

<p><code>3.56 MB/s / 25 = 145 KB</code></p>

<p>That is around 145 KB for each <code>1910 x 1080</code> pixel picture?! I don't know what I'm doing wrong here...</p>
 2836: <p>What you are missing is that not every frame is stored as a picture.  A large number of frames are stored simply by keeping track of what changed from the previous picture.  If you think about most video, not a whole lot is actually changing since the majority of the scene stays the same or moves in a similar pattern.  By describing only the changes, the amount of space required can be reduced drastically.</p>

<p>This is why the actual data "per frame" can be so low since only a fraction of the frames are actually full frames.</p>
