Double Images from Fast Panning Shots in PP at DVinfo.net

Dave Dyar · July 4th, 2011, 08:03 PM

When I encode my AVCHD videos in Premier Pro CS 5.5 I get a double image on shots at points when there is a fast pan or other fast movement. The original video and the video in the Premiere Pro Program View window do not show the double images. One strange thing is that the double image appears in PPro's Export Settings Source Preview window before I even start the encoding. The exact same frame is displayed in the Program View without the double images. I am encoding the video using the media encoder's Match Sequence setting so there should not be any difference in the settings between the original file and the encoded file. I'm attaching two images to demonstrate the problem. I appreciate any advice.

The original .M2TS video file is shot on a Sony HXR-NX5U.

Sony's Content Manager Utility shows the file was recorded in the camera as follows:

Video Codec AVC
Video bit rate: 21 Mbps
Video frame rate 60i

In Premier Pro the Match Sequence Settings show

Source: 1920X1080 (1.0) 29.97 fps, Upper

Output: 1920 x 1080, 29.97 fps, Upper, Quality 50

It's listing MPEG I-Frame as the Video Codec.

Bart Walczak · July 5th, 2011, 01:52 AM

It looks like interlacing to me, which is perfectly fine for the 60i footage that you have.

To see the full picture in program monitor select the side menu, and choose resolution at playback: full, resolution at pause: full, display both fields. By default, you'll be seeing only the first field and half resolution for increased performance.

Since it's interlaced footage, it would be best if you monitor this on an external monitor, to see if it is a problem. It shouldn't be.

If you only wish to deliver it for computer screen, choose progressive frame on export, the players will deinterlace it anyway, and usually be worse than if you do it by yourself in the encoder.

Wesley Cardone · July 5th, 2011, 02:34 PM

Any GOP format codec such as AVCHD or HDV is extremely limited for pan shooting. You cannot do fast pans and that is just a limitation of the format. Every fifteen frames only include two complete frames. At least with 480i you have full frames you are capturing making it much more suitable for pans.

July 4th, 2011, 08:03 PM	#1
Dave Dyar New Boot Join Date: Feb 2010 Location: Upper Marlboro, MD Posts: 11	Double Images from Fast Panning Shots in PP When I encode my AVCHD videos in Premier Pro CS 5.5 I get a double image on shots at points when there is a fast pan or other fast movement. The original video and the video in the Premiere Pro Program View window do not show the double images. One strange thing is that the double image appears in PPro's Export Settings Source Preview window before I even start the encoding. The exact same frame is displayed in the Program View without the double images. I am encoding the video using the media encoder's Match Sequence setting so there should not be any difference in the settings between the original file and the encoded file. I'm attaching two images to demonstrate the problem. I appreciate any advice. The original .M2TS video file is shot on a Sony HXR-NX5U. Sony's Content Manager Utility shows the file was recorded in the camera as follows: Video Codec AVC Video bit rate: 21 Mbps Video frame rate 60i In Premier Pro the Match Sequence Settings show Source: 1920X1080 (1.0) 29.97 fps, Upper Output: 1920 x 1080, 29.97 fps, Upper, Quality 50 It's listing MPEG I-Frame as the Video Codec. Attached Images

July 5th, 2011, 01:52 AM	#2
Bart Walczak Major Player Join Date: Apr 2006 Location: Warsaw/Poland Posts: 716	Re: Double Images from Fast Panning Shots in PP It looks like interlacing to me, which is perfectly fine for the 60i footage that you have. To see the full picture in program monitor select the side menu, and choose resolution at playback: full, resolution at pause: full, display both fields. By default, you'll be seeing only the first field and half resolution for increased performance. Since it's interlaced footage, it would be best if you monitor this on an external monitor, to see if it is a problem. It shouldn't be. If you only wish to deliver it for computer screen, choose progressive frame on export, the players will deinterlace it anyway, and usually be worse than if you do it by yourself in the encoder. __________________ Creative Impatience - The Solace of Simple Solutions. A few useful plugins for Adobe users, and my remarks on the tools and the craft in general.

July 5th, 2011, 02:34 PM	#3
Wesley Cardone Regular Crew Join Date: Jul 2006 Location: Chelsea, Michigan Posts: 104	Re: Double Images from Fast Panning Shots in PP Any GOP format codec such as AVCHD or HDV is extremely limited for pan shooting. You cannot do fast pans and that is just a limitation of the format. Every fifteen frames only include two complete frames. At least with 480i you have full frames you are capturing making it much more suitable for pans. __________________ Wesley Cardone www.WCardoneProductions.com, Detroit and Lansing, Michigan