Need Help! Trying something unusual at DVinfo.net

Emrys Roberts · October 30th, 2009, 12:45 PM

Basically I am trying to use an HV40 as a webcam to do a live web broadcast through my companies main network. So far everything has worked but I'm experiencing some very strange field separation issues. When ever I pan it's incredibly apparent. Anyone got any ideas on how to fix this? Has anyone had the same issue before?

The camera is connected to the computer via fire-wire. The application we're using to broadcast is Microsoft Live Meeting. Any help would be greatly appreciated. :)

Roger Van Duyn · October 30th, 2009, 01:36 PM

It quite possibly is the "rolling shutter" phenomena from the cmos chip in the HV40. I have two HV30s, and pans just don't work well unless they are extremely, extremely slow. Otherwise, you can have a "rippling jello" effect. Do a search on rolling shutter on the forums. There are some demo clips illustrating the effect. For instance, if you pan while filming a rail fence, the fence rails become slanted, due to the way cmos chips work. Pans must be extremely slow and smooth with cmos cameras to not have problems from the rolling shutter.

Maybe some of the real experts can enlighten you more.

Stuart Robinson · October 30th, 2009, 02:22 PM

If the camera is set to 60i then there's a chance the playback software isn't deinterlacing it, either correctly or at all. Webcam software, for example, more often than not expects progressive footage.

You may want to try setting the camera to 30p and see if that helps.

Emrys Roberts · October 30th, 2009, 02:46 PM

I thought it could possibly be the CMOS censor as well, so I used the back-up GL2 and it had the same phenomenon. It's really strange. It almost looks like the computer is only displaying one field. :(

Emrys Roberts · October 30th, 2009, 02:56 PM

Quote:

Originally Posted by Stuart Robinson

If the camera is set to 60i then there's a chance the playback software isn't deinterlacing it, either correctly or at all. Webcam software, for example, more often than not expects progressive footage.

You may want to try setting the camera to 30p and see if that helps.

Oh good idea. I try that next time and see if that helps. Thanks :)

October 30th, 2009, 12:45 PM	#1
Emrys Roberts Regular Crew Join Date: Oct 2008 Location: Denver, CO Posts: 78	Need Help! Trying something unusual Basically I am trying to use an HV40 as a webcam to do a live web broadcast through my companies main network. So far everything has worked but I'm experiencing some very strange field separation issues. When ever I pan it's incredibly apparent. Anyone got any ideas on how to fix this? Has anyone had the same issue before? The camera is connected to the computer via fire-wire. The application we're using to broadcast is Microsoft Live Meeting. Any help would be greatly appreciated. :) __________________ Website: http://rougheditproductions.com/ Vimeo Profile: http://vimeo.com/roughedit

October 30th, 2009, 01:36 PM	#2
Roger Van Duyn Major Player Join Date: Feb 2009 Location: Lakeland Florida Posts: 692	It quite possibly is the "rolling shutter" phenomena from the cmos chip in the HV40. I have two HV30s, and pans just don't work well unless they are extremely, extremely slow. Otherwise, you can have a "rippling jello" effect. Do a search on rolling shutter on the forums. There are some demo clips illustrating the effect. For instance, if you pan while filming a rail fence, the fence rails become slanted, due to the way cmos chips work. Pans must be extremely slow and smooth with cmos cameras to not have problems from the rolling shutter. Maybe some of the real experts can enlighten you more. __________________ Roger My YouTube Channel: https://www.youtube.com/channel/UCAp...2AHr_pHFID5LDA

October 30th, 2009, 02:46 PM	#4
Emrys Roberts Regular Crew Join Date: Oct 2008 Location: Denver, CO Posts: 78	I thought it could possibly be the CMOS censor as well, so I used the back-up GL2 and it had the same phenomenon. It's really strange. It almost looks like the computer is only displaying one field. :( __________________ Website: http://rougheditproductions.com/ Vimeo Profile: http://vimeo.com/roughedit

October 30th, 2009, 02:22 PM	#3
Stuart Robinson Regular Crew Join Date: Aug 2009 Location: Chester, UK Posts: 48	If the camera is set to 60i then there's a chance the playback software isn't deinterlacing it, either correctly or at all. Webcam software, for example, more often than not expects progressive footage. You may want to try setting the camera to 30p and see if that helps.