Anyone know why the Aja Ki Pro Mini detects an interlaced signal from HD-SDI output (even though I have the F3 set to 1080p)?
I've read that the F3 PsF output is an interlaced signal with progressive data.
AJA Ki Pro Mini (Interlaced Signal)
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darraghsinnott
- Posts: 6
- Joined: March 20th, 2011, 9:31 pm
Re: AJA Ki Pro Mini (Interlaced Signal)
I think that's because it is in fact an interlaced signal that the F3 sends on the HD-SDI output irrespective of whether the camera is set to interlaced or progressive.
However when he camera is in a progressive mode (e.g. 1080P) the frame being transmitted is in fact a single progressive frame captured from the sensor that has been divided into two interlaced fields for transmission on the HD-SDI 50i or 60i stream. The two interlaced fields can be re-combined to generate the original progressive frame that was captured. This would not be true of an actual interlaced signal where there is a time difference between the capture of the even and odd fields from the sensor.
Why it works like this I don't know - Perhaps it's because it's cheaper to implement and/or it's more compatible with the various transmission systems?
You can configure the KiPro to interpret the input as a progressive (PsF) through one of it's menu settings but I'm not sure that's actually necessary when feeding it a PsF signal from the F3. I have my KiPro set to PsF anyway just in case.
hope that helps - hope that's right?
Darragh.
However when he camera is in a progressive mode (e.g. 1080P) the frame being transmitted is in fact a single progressive frame captured from the sensor that has been divided into two interlaced fields for transmission on the HD-SDI 50i or 60i stream. The two interlaced fields can be re-combined to generate the original progressive frame that was captured. This would not be true of an actual interlaced signal where there is a time difference between the capture of the even and odd fields from the sensor.
Why it works like this I don't know - Perhaps it's because it's cheaper to implement and/or it's more compatible with the various transmission systems?
You can configure the KiPro to interpret the input as a progressive (PsF) through one of it's menu settings but I'm not sure that's actually necessary when feeding it a PsF signal from the F3. I have my KiPro set to PsF anyway just in case.
hope that helps - hope that's right?
Darragh.
Re: AJA Ki Pro Mini (Interlaced Signal)
Thanks for the info. Darragh...
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alisterchapman
- Site Admin
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- Joined: February 1st, 2011, 7:43 pm
Re: AJA Ki Pro Mini (Interlaced Signal)
Darragh is indeed correct. The conventional standard for 1080 HDSDI progressive is PsF, which looks like an interlace signal to any device receiving it.
One word of caution. Only set the device to PsF if you are sending it a progressive signal. By setting the device to PsF the clips recorded will be marked as Progressive. If you accidentally send a true interlace signal and the recordings get marked as progressive, any renders or processing will treat the clip as progressive and you may get problems with the fields becoming combined or see combing within the footage. So only set the recorder to PsF if you are sending a progressive signal. If at all unsure do not set it to PsF as progressive clips marked as interlace will not generally show any issues when edited or rendered, while interlace marked as progressive can be a complete nightmare.
One word of caution. Only set the device to PsF if you are sending it a progressive signal. By setting the device to PsF the clips recorded will be marked as Progressive. If you accidentally send a true interlace signal and the recordings get marked as progressive, any renders or processing will treat the clip as progressive and you may get problems with the fields becoming combined or see combing within the footage. So only set the recorder to PsF if you are sending a progressive signal. If at all unsure do not set it to PsF as progressive clips marked as interlace will not generally show any issues when edited or rendered, while interlace marked as progressive can be a complete nightmare.
Re: AJA Ki Pro Mini (Interlaced Signal)
Psf is Sony's workaround to allow older equipment support progressive data (so there is no hardware update needed).