horizontal banding of video images, motion artifacts

[wmclaxton]

I am using the Hauppauge USB-Live2 capture device for presentation recording. The OS is Win7 64-bit. Because Vidcap and Amcap are not compatible with the OS, I'm using NCH Debut for basic camera tests and monitoring, and Panopto for presentation recording (http://panopto.com). The video signal is PAL-B.

 

With Debut, the camera images are beautiful. However for whatever reason, the images are not good in Panopto. There is an artifact that I would call horizontal 'banding' whenever something is moving in the frame (or when the camera moves). This banding is present both in the preview and the recorded images. And I have documented the same problem on two different PCs with different PAL camera sources and different USB Live2 capture devices.

 

Here is a document with screenshots (http://itr8.com/hosted/ftp_guest/nafa/panopto_troubleshooting_screencaps_rev2.pdf) and a short video clip (http://itr8.com/hosted/ftp_guest/nafa/banding_error.wmv) both of which illustrate the problem.

 

I know this is a bit off-topic for Debut forums, but please help with suggestions if you have had any similar experiences. Thanks!

panopto_troubleshooting_screencaps_rev2.pdf

[wmclaxton]

Someone in another forum suggested Panopto was not "using a deinterlacing filter in the playback graph", which sounded about right. I wrote to Panopto and they said that I could modify my recording template file to fix the banding on the recording. They suggested to change the recording size from 320 x 240 to 320 x 288, to reflect the different height of the PAL image when compared to NTSC.

 

Sure enough, this change worked so the banding is now gone from the recorded footage. It is still present in the preview, but I'm pretty sure Panopto will fix this in due course.