Skip to the end of navigation

Welcome to the Community!

F5 & F55

Showing results for 
Search instead for 
Do you mean 
Reply
Specialist
Posts: 19
Registered: ‎03-23-2013
Message 1 of 80 (2,257 Views)
Accepted Solution

HFR XAVC 120p, 1080 HD Blocky Image

[ Edited ]

Just shot a few scenes at 120p in various ISO's from 3200 all the way up to 8000 in XAVC and SLOG 2 directly to SXS pro + cards.  There seems to be an increased "compression" level as you push up the ISO.  It looks less like the sort of noise when recording at 23.98 or even 60p for that matter and more like compression blocks.  Anyone else have the same experience?  Is this due to a detail or noise reduction setting somehow?  I did an all reset after the V 2.0 update so may have forgotten to turn something back off again.  

 

The image looks mostly clean at the lower ISO's.

 

I am viewing at full resolution in Content Browser Version 2.01.423

 

 

Expert
Posts: 584
Registered: ‎11-19-2012
Message 2 of 80 (2,224 Views)

Re: HFR XAVC 120p, 1080 HD Blocky Image

[ Edited ]

I think it's aliasing, not compression. It would appear not every pixel is being read out from the sensor above 60fps, therefore aliasing starts to happen and net noise goes up.

 

I'm doing tests to see if raw via R5 helps at all, etc etc. 

 

I'm not sure it's usable to me because of this...

 

There is going to be an OLPF (optical low-pass filter) to put in front of the sensor to help with this, but it's not something you can switch out from shot to shot on a job you're going back and forth between 24 and 120 or 240.

www.nateweaver.net
Specialist
Posts: 19
Registered: ‎03-23-2013
Message 3 of 80 (2,213 Views)

Re: HFR XAVC 120p, 1080 HD Blocky Image

[ Edited ]

Whoa that's nuts! One major reason I bought this camera was for the high frame rates. I have waited patiently all this time for the ability to record as advertised and now to hear it is compromised in this way is shocking. I'm at a loss as to what to do. Will wait until I either hear more about the raw version or directly from Sony. I'm using this footage on a major ABC Special that is supposed to air in November for sweeps. Scary stuff.  Why was this not made explicit in the advertising of this camera? Was I suppose to somehow know this by osmosis?

JBH Apprentice
Apprentice
Posts: 13
Registered: ‎03-13-2013
Message 4 of 80 (2,173 Views)

Re: HFR XAVC 120p, 1080 HD Blocky Image

[ Edited ]

Hard to say. I've checked my XAVC -Files and 2K-RAW and cannot see any blocks tough the RAWs are much cleaner...

 

Screenshots?

 

JBH
Expert
Posts: 401
Registered: ‎11-20-2012
Message 5 of 80 (2,168 Views)

Re: HFR XAVC 120p, 1080 HD Blocky Image

120 HFR XAVC looks great over here. Super clean.
Reuben Steinberg
reubendp.com
@reubendp
Expert
Posts: 584
Registered: ‎11-19-2012
Message 6 of 80 (2,148 Views)

Re: HFR XAVC 120p, 1080 HD Blocky Image


JBH wrote:

 

Screenshots?

 


Can't really see it in screenshots. Much more visible in motion. Have to have tons of small detail in frame and small amounts of camera movement, like handheld.

www.nateweaver.net
Specialist
Posts: 19
Registered: ‎03-23-2013
Message 7 of 80 (2,107 Views)

Re: HFR XAVC 120p, 1080 HD Blocky Image

[ Edited ]

Blaine.120FPS.Blocky.Compression.2.jpgBlaine.120fps.Choppy.Compression.jpg

 

This is an image shot with a 135mm Nikon Prime and the Optitek Nikon adapter.  It was at roughly an f2.8 and 8000 ISO at 120fps and SLOG 2 XAVC direct to the SXS Pro + cards.  I shot this last night just before the sun was completely down. 

Expert
Posts: 305
Registered: ‎11-19-2012
Message 8 of 80 (2,098 Views)

Re: HFR XAVC 120p, 1080 HD Blocky Image


nweaver wrote:

I think it's aliasing, not compression. It would appear not every pixel is being read out from the sensor above 60fps, therefore aliasing starts to happen and net noise goes up.



I did notice excessive noise in the raw clip I sent you.  I'll have to do some more tests to be sure.  The only way at present to check 240fps footage (for me) on a HD-SDI monitor is to do a DPX conversion in viewer, then play it in Premiere.

Peter Corbett
Powerhouse Productions
www.php.com.au
https://vimeo.com/92718514

https://vimeo.com/92718514
Expert
Posts: 305
Registered: ‎11-19-2012
Message 9 of 80 (2,099 Views)

Re: HFR XAVC 120p, 1080 HD Blocky Image


reubendp wrote:
120 HFR XAVC looks great over here. Super clean.

I agree.  The 120fps XAVC looks good in my tests, better than the 2K raw stuff.   But until the Adobe raw plugin has been fixed, the jury is out.

Peter Corbett
Powerhouse Productions
www.php.com.au
https://vimeo.com/92718514

https://vimeo.com/92718514
Expert
Posts: 305
Registered: ‎11-19-2012
Message 10 of 80 (2,096 Views)

Re: HFR XAVC 120p, 1080 HD Blocky Image


nweaver wrote:
Can't really see it in screenshots. Much more visible in motion. Have to have tons of small detail in frame and small amounts of camera movement, like handheld.

Yes, as Nate says it's more noticable in motion.  It probably won't be a problem tracking an athlete, vehicle or moving central subject, but it is visible in pans, exhibiting similar charateristics to the FS700

Peter Corbett
Powerhouse Productions
www.php.com.au
https://vimeo.com/92718514

https://vimeo.com/92718514

Get Social

Share your ideas Watch YouTube Support Videos follow us on Twitter Visit us on Facebook