Re: does HPX170 shoot 1080p?

[Michael Sacci] "Took me a while to convince one person that it was truly progressive. It writes as segmented frames but it is a true progressive frame when it is put back together "


Yes it can be very confusing unless you understand the origin.

Film is projected at 24 frames a second, however in most film projectors the shutter opens and closes twice for everyone of those film frames as they pass by the lens. SO film to your eye is actually 48 distinct images per second since the opening and closing of the shutter makes your eye > brain connection thinks (or presumes) that it is seeing more frames than actually exist.

Progressive Segmented Frame is a modernized version of the same process for video. The Frames are captured progressively at the camera and then during transport the signal is split into odd and even lines - like transmission and the device on the receiving end of that signal can take it as 48i/24p or as 25p/50i.


So that NLE's like FCP/ AE /Premier capture and handle the file as a progressive signal internally, but the transport over baseband (component or HDSDI) to your monitor or deck allows that device to see and control on the output side whether to understand and accept the signal as interlace or take a second look to see that it is a progressive signal "in transport"

Remember that Monitors are lazy (less expensive) so they will take the first signal it understands; ie: the interlace signal. Traditional most LCD's will show data as "i" when asked to display info on a signal. Some MFGs still try to confuse the situation.

HDMI is an issue for another day.



gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows

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