HMC40/80 in 1080 25P Mode Problem at DVinfo.net

Chris Harding · June 7th, 2011, 08:10 PM

Hi Guys

I have a break from weddings so I thought I would give my progressive modes a shot!!! (I have been shooting in 1080i at weddings)

Any great ideas on why the footage pixellates???? I have attached a still shot and if you look at the tree branches you can see extensive pixellation there. Cam was in PH 1080 25P mode (PAL cameras) and it also seems to do the same thing in 720 as well.

Some help would be greatly appreciated as I don't want this sort of thing in my wedding footage when the season begins in 2 months!!!!

Chris

Phil Lee · June 13th, 2011, 02:10 PM

Hi

That is a very odd result, it doesn't look like typical compression artefacts you get with AVCHD.

What recording rate/quality is it set for?

What are you using to view the files, it might be the decoding software adding those blocks.

Regards

Phil

Chris Harding · June 13th, 2011, 08:24 PM

Hi Phil

Thanks a lot...I found the issue!!! The MTS files are pristine when played in VLC media player BUT because my DuoCore 2.2GHz struggles with AVCHD I usually transcode the files to HDV using Upshift..I encoded these the same as I usually do at 50mbps and leave the interlacing setting at "Copy From Input" (since it's already progressive) and set key frames and GOP at 1 (same settings I use for interlaced transcoding) and THAT'S where the pixellation is coming from.!!!!

I wonder why Upshift doesn't appear to be too happy converting progressive footage??? When I transcode normal 1080i I use the same settings but set interlacing to "Progressive" so I have de-interlaced footage for Sony Vegas ... it only seems to create the pixellation when trying to convert progressive raw footage.

Thanks again for identifying the source of the problem..at least I know the cameras are OK!!! Hmmm maybe I need to see if Cineform does a better job???

Chris

June 7th, 2011, 08:10 PM	#1
Chris Harding Inner Circle Join Date: Jul 2009 Location: Perth, Western Australia Posts: 8,441	HMC40/80 in 1080 25P Mode Problem Hi Guys I have a break from weddings so I thought I would give my progressive modes a shot!!! (I have been shooting in 1080i at weddings) Any great ideas on why the footage pixellates???? I have attached a still shot and if you look at the tree branches you can see extensive pixellation there. Cam was in PH 1080 25P mode (PAL cameras) and it also seems to do the same thing in 720 as well. Some help would be greatly appreciated as I don't want this sort of thing in my wedding footage when the season begins in 2 months!!!! Chris Attached Thumbnails

June 13th, 2011, 02:10 PM	#2
Phil Lee Major Player Join Date: Feb 2010 Location: London Posts: 302	Re: HMC40/80 in 1080 25P Mode Problem Hi That is a very odd result, it doesn't look like typical compression artefacts you get with AVCHD. What recording rate/quality is it set for? What are you using to view the files, it might be the decoding software adding those blocks. Regards Phil

June 13th, 2011, 08:24 PM	#3
Chris Harding Inner Circle Join Date: Jul 2009 Location: Perth, Western Australia Posts: 8,441	Re: HMC40/80 in 1080 25P Mode Problem Hi Phil Thanks a lot...I found the issue!!! The MTS files are pristine when played in VLC media player BUT because my DuoCore 2.2GHz struggles with AVCHD I usually transcode the files to HDV using Upshift..I encoded these the same as I usually do at 50mbps and leave the interlacing setting at "Copy From Input" (since it's already progressive) and set key frames and GOP at 1 (same settings I use for interlaced transcoding) and THAT'S where the pixellation is coming from.!!!! I wonder why Upshift doesn't appear to be too happy converting progressive footage??? When I transcode normal 1080i I use the same settings but set interlacing to "Progressive" so I have de-interlaced footage for Sony Vegas ... it only seems to create the pixellation when trying to convert progressive raw footage. Thanks again for identifying the source of the problem..at least I know the cameras are OK!!! Hmmm maybe I need to see if Cineform does a better job??? Chris