Hi Duke…
you guys might correct me….
H264 does compression across groups of frames. That’s why the file size is significantly smaller. But it takes the computer more effort to display those frames, because it has to read across the groups to do the reconstruction for display.
DNX flavors only do compression within each given frame.
Every frame exists as a frame and it takes the computer less horsepower to display.
The file size in DNX is reduced enough to make it easy on the drives to sustain the reading of the file…and easy enough for the CPU to send it to the display….
ProRes (for mac) would work in much the same way, for the exact same reason.
All these things are “lossy” compression…..meaning data is discarded when you transcode….but it’s negligible for your purposes.
hth,
Alex Udell
Editing, Motion Graphics, and Visual FX
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