Two issues with Vegas and Sony Ax100 4K at DVinfo.net

Go Back   DV Info Net > Windows / PC Post Production Solutions > What Happens in Vegas...

What Happens in Vegas...
...stays in Vegas! This PC-based editing app is a safe bet with these tips.


Reply
 
Thread Tools Search this Thread
Old August 2nd, 2015, 04:12 PM   #1
Regular Crew
 
Join Date: Feb 2015
Location: Newbury UK
Posts: 43
Two issues with Vegas and Sony Ax100 4K

I have two issues which I would like to see if anyone else has experienced.

1). When rendering down from 4K to 2K using the Sony AVC (or Mainconcept MPEG2) to Blu-ray 24p I get pumping/flashing of light areas during movement of the image. For example in a shot of a house with white drain pipe the drain pipe flashes in intensity as you slowly pan across. Also happens with window frames etc.

2). Rendering down to SD DVD produces a poor quality image with shimmering on any movement even when setting to two pass MPEG2. I have to use Video to Video converter which uses ffmpeg as a compressor which gives a MUCH better image quality.

Andy
Andy Smith is offline   Reply With Quote
Old August 2nd, 2015, 11:57 PM   #2
Major Player
 
Join Date: Oct 2012
Location: Riga, Latvija, EU
Posts: 280
Re: Two issues with Vegas and Sony Ax100 4K

Hi, Andy
This phenomenon is called Aliassing and is not specific for the AX-100
https://en.wikipedia.org/wiki/Aliasing
https://en.wikipedia.org/wiki/Anti-aliasing_filter
Juris Lielpeteris is offline   Reply With Quote
Old August 3rd, 2015, 06:18 AM   #3
Regular Crew
 
Join Date: Feb 2015
Location: Newbury UK
Posts: 43
Re: Two issues with Vegas and Sony Ax100 4K

Juris, many thanks for the links about the issue, very interesting. Luckily the effect is not such that it spoils the video, it is just noticeable as an element not visible in the original clips.
Andy Smith is offline   Reply With Quote
Old August 9th, 2015, 04:01 PM   #4
Inner Circle
 
Join Date: Feb 2007
Location: Apple Valley CA
Posts: 4,866
Re: Two issues with Vegas and Sony Ax100 4K

You may want to play with frame rates - this came up in the never ending thread when the AX100 came out - I myself saw it as a "flashing" (could also call it "shimmer" or "pulsing") sort of effect on high contrast edges. Some criticized the camera as being somehow defective, when it's really just a by product of the super sharp image quality!

I believe it is at least in part the result of high shutter speeds creating what in effect a series of 30 "stills" per second, which then creates a jerky feel to moving images. This "effect" can then make it look like high contrast elements are flashing or pulsing as they move...

Once I started to run in manual and keep shutter speeds down (auto can bump them WAY up, I've had best luck under 125, 60 or 90 seem to be workable with ND's even in bright sunlight), it introduced a slight natural motion blur that for the most part eliminated the "pulsing".

In turn, you may want to try to fiddle with settings while exporting? I found the "fix it while shooting" effective, never been a "fix it in the mix" kind o' guy!

Hopefully you'll find this useful, not sure how one would fix existing footage if the shutter was too fast, maybe a "blur" filter of some sort? Of course we want the super sharp 4K image, seems a shame to add "blur" to it!
Dave Blackhurst is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Windows / PC Post Production Solutions > What Happens in Vegas...

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 05:18 AM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network