Gear Talk > EOS Bodies - For Video

IPB vs ALL-I settings

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Wilmark:
Has anyone done any extensive comparison about choosing between these two settings other than the fact that one produces much larger files. The manual says it is easier to edit in post.

Axilrod:

--- Quote from: Wilmark on May 22, 2012, 03:08:11 AM ---Has anyone done any extensive comparison about choosing between these two settings other than the fact that one produces much larger files. The manual says it is easier to edit in post.

--- End quote ---

All-I may have a bit more latitude in terms of post, but I thought the IPB responded to changes just fine and I honestly couldn't tell the difference between the two.  I've heard if there is going to be a lot of motion involved that ALL-I is better, but for relatively static subjects I think IPB is just fine (and much smaller!)

psolberg:
IMO all-i looks worse often and not better often enough so I wouldn't use it for anything as the file size doesn't really yield better quality.

HurtinMinorKey:
I think the basic deal is that you get more latitude in post, but only if you are editing frame by frame. If you are applying edits to the whole take, then IPB is just as good for editing. Furthermore, IPB has more detail in each frame because it isn't reliant on each frame providing all the information for the entire frame.  Many people have reported block artifacts with ALL-I, because it requires significant compression in each frame.

Think about it, truly uncompressed 1080, ALL-I should be (2M(resolution)*3bytes(24bit color)*(24fps)=144 MB/s=1.1Gb/s

The 5dmkiii max data rate is 1/10th of that, so it requires massive compression in each frame. IPB circumvents this issue somewhat by putting more detail in a key frame.

Cptn Rigo:

--- Quote from: HurtinMinorKey on May 23, 2012, 12:05:47 PM ---I think the basic deal is that you get more latitude in post, but only if you are editing frame by frame. If you are applying edits to the whole take, then IPB is just as good for editing. Furthermore, IPB has more detail in each frame because it isn't reliant on each frame providing all the information for the entire frame.  Many people have reported block artifacts with ALL-I, because it requires significant compression in each frame.

Think about it, truly uncompressed 1080, ALL-I should be (2M(resolution)*3bytes(24bit color)*(24fps)=144 MB/s=1.1Gb/s

The 5dmkiii max data rate is 1/10th of that, so it requires massive compression in each frame. IPB circumvents this issue somewhat by putting more detail in a key frame.

--- End quote ---

144 MB/s=1.1Gb/s mhhh.... nope  ;)

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