LCD delay connected to ioHD

[Carsten Orlt]

The ioHD only outputs 1080i at this stage?

Carsten

[Gary Adcock]

[Carsten Orlt] “The ioHD only outputs 1080i at this stage?”

not true

it is the HDMI 1.1 spec does not support 24/25 playback – it has nothing to do with the geometry – it is the same in 720p also.

The HDMI 1.1 spec did not allow for professional frame rates, since it was designed specifically for consumer use, they did not include any format that was not in the SMTPE delivery spec.

and those were only 50/60 as Interlace or Progressive depending on the frame(geometry)

gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows
Inside look at the IoHD

[Carsten Orlt]

[gary adcock] “[Carsten Orlt] “The ioHD only outputs 1080i at this stage?”

not true “

but why then can I then only select 1080i25 and not 1080p25 in either the Aja Control panel/Aja TV/FCP? and I know that 1080i25 should be actually called 1080psf25

also you confirmed in other threats that there is no 1080p television standard at this stage and all 1080 is interlaced be it 50i or 60i(59.97)

I’m totally confused now 🙂

But it doesn’t matter. I know that it happens (the delay) and why. and I finally can see the full 1080 signal for final judgement.

Thanks Gary!!

Carsten

[Gary Adcock]

[Carsten Orlt] “but why then can I then only select 1080i25 and not 1080p25 “
you are not working in 1080p unless you recorded the content outside the camera-NO 1080 camera that I know of recording internally as true P. Unless it is recording FRAMES only.

The default format in 1080 is called PsF and is handled on playback as interlace, even though the image may have been captured as progressive. This is the same way that movies are played in the theatre with a shutter opening and closes 2x on every frame of film shown.- it smoothes the motion to the eye.

“also you confirmed in other threats that there is no 1080p television standard at this stage and all 1080 is interlaced be it 50i or 60i(59.97) “

partially correct –there is no BROADCAST standard for Satellite/ OTA transmission that is not 50i/p or 60i/p – there are deliver specs for other frame rates, just not transmission.

note that the issue with your BENq display is the HDMI connection you are using only conforms to the most primitive / basic / cheapest of the delivery standards.

gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows
Inside look at the IoHD

[Carsten Orlt]

[gary adcock] “you are not working in 1080p unless you recorded the content outside the camera-NO 1080 camera that I know of recording internally as true P. Unless it is recording FRAMES only.
“

if nothing records in 1080p what is your point then?

sorry for being so blunt but if I work in 1080i and HDMI only supports 1080i and the ioHD only outputs 1080i using the component analogue output will not change anything??
also the delay caused by the monitor buffering the 2 fields to then display them as one will not change because I’m still working in 1080i which I can’t change because I’m working with footage created by cameras and not cgi or whatever and according to your statement therefor will never be 1080p…

I just can’t follow your logic?

Carsten

[Gary Adcock]

[Carsten Orlt] “if I work in 1080i and HDMI only supports 1080i and the ioHD only outputs 1080i using the component analogue output will not change anything?? “

The IoHD can do more than 1080.

Your audio sync problem lies within the HDMI specs and your budget display purchase NOT the Iohd. AJA products only pass the audio thru.

However using component analog audio and video to the display will fix your SYNC issue.

gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows
Inside look at the IoHD

[Rob Alexander]

Carsten,

did connecting analogue component sort out the problem?

[Carsten Orlt]

I didn’t try 🙂
I bought the LCD so I can see a 1:1 representation of my 1080i footage. I want to do this in the best possible way meaning no signal degradation via digital-analogue conversion. I know that I can’t trust the color/luminance of the LCD but that doesn’t matter because I’m not using it for grading. I need to see the full HD signal on a larger screen to evaluate focus and general defects which I can’t do a 100% on the SD CRT because its down-converted.
That the LCD introduces a delay because of buffering is annoying but less important to me then the cleanest signal path. I also use the DVI input on the LCD (via HDMI-DVI adapter on the ioHD HDMI output) because of the way the monitor works and allows for more picture tweaking.
Lastly Aja hinted some upcoming changes which may solve the problem.
Lets wait and see for now.

Carsten