Number of renders before quality loss? at DVinfo.net

Will Nuttall · July 30th, 2003, 02:00 AM

Hi,

I'm having problems with macroblocking/pixelization when I render DV AVI more than once. For example if I add a effect to a movie, render it and export it as an AVI then import that AVI into the timeline and add an other effect I get very obvious loss of quality. (Lots of little vertical line on a TV) blocks on a Computer monitor. Is this normal? I am using Premiere 6.02

Rob Lohman · July 30th, 2003, 04:27 PM

Can you describe the process more detailed? What intermediate
formats/codecs are you using?? You can see a loss on a TV?

Will Nuttall · July 30th, 2003, 11:01 PM

I import the DV footage to PC via firewire and import that into the timeline. I add an effect to the footage and render that and save it as a DV PAL AVI. If I then import the saved file back into the timeline, add an effect and render that as another AVI the quality loss is very noticeable on TV and monitor. I have the same problem with different cameras and firewire cards. There is a slight loss of quality even after the first render. I have tried it on two other PCs and have had the same result. I also tried a MAC and had no problems. I have no idea what is going on.

Alex Knappenberger · July 30th, 2003, 11:10 PM

First of all, are you in europe/PAL land? In other words, is your camera a PAL camera? If your in the USA, then save it as a NTSC DV.

The Microsoft DV codec (which premiere uses) isn't as good as sonic foundry's or some other ones, but you shouldn't notice any quality loss up until about 15 renders.

Rob Lohman · July 31st, 2003, 04:26 AM

Which OS are you on? That depicts which Microsoft DV Codec version
you are using. Some older OSes had some really bad DV codec
versions.

Why are you saving it out and then importing it again? You can
just layer the effects and output to your final format.

July 30th, 2003, 02:00 AM	#1
Will Nuttall Regular Crew Join Date: Jun 2003 Posts: 25	Number of renders before quality loss? Hi, I'm having problems with macroblocking/pixelization when I render DV AVI more than once. For example if I add a effect to a movie, render it and export it as an AVI then import that AVI into the timeline and add an other effect I get very obvious loss of quality. (Lots of little vertical line on a TV) blocks on a Computer monitor. Is this normal? I am using Premiere 6.02

July 30th, 2003, 04:27 PM	#2
Rob Lohman RED Code Chef Join Date: Oct 2001 Location: Holland Posts: 12,514	Can you describe the process more detailed? What intermediate formats/codecs are you using?? You can see a loss on a TV? __________________ Rob Lohman, visuar@iname.com DV Info Wrangler & RED Code Chef Join the DV Challenge \| Lady X Search DVinfo.net for quick answers \| Buy from the best: DVinfo.net sponsors

July 31st, 2003, 04:26 AM	#5
Rob Lohman RED Code Chef Join Date: Oct 2001 Location: Holland Posts: 12,514	Which OS are you on? That depicts which Microsoft DV Codec version you are using. Some older OSes had some really bad DV codec versions. Why are you saving it out and then importing it again? You can just layer the effects and output to your final format. __________________ Rob Lohman, visuar@iname.com DV Info Wrangler & RED Code Chef Join the DV Challenge \| Lady X Search DVinfo.net for quick answers \| Buy from the best: DVinfo.net sponsors

July 30th, 2003, 11:01 PM	#3
Will Nuttall Regular Crew Join Date: Jun 2003 Posts: 25	I import the DV footage to PC via firewire and import that into the timeline. I add an effect to the footage and render that and save it as a DV PAL AVI. If I then import the saved file back into the timeline, add an effect and render that as another AVI the quality loss is very noticeable on TV and monitor. I have the same problem with different cameras and firewire cards. There is a slight loss of quality even after the first render. I have tried it on two other PCs and have had the same result. I also tried a MAC and had no problems. I have no idea what is going on.

July 30th, 2003, 11:10 PM	#4
Alex Knappenberger High School Student Join Date: Apr 2003 Location: Canton, Ohio, USA Posts: 609	First of all, are you in europe/PAL land? In other words, is your camera a PAL camera? If your in the USA, then save it as a NTSC DV. The Microsoft DV codec (which premiere uses) isn't as good as sonic foundry's or some other ones, but you shouldn't notice any quality loss up until about 15 renders.