wmv render problems at DVinfo.net

Go Back   DV Info Net > Windows / PC Post Production Solutions > What Happens in Vegas...

What Happens in Vegas...
...stays in Vegas! This PC-based editing app is a safe bet with these tips.


Reply
 
Thread Tools Search this Thread
Old June 25th, 2007, 03:32 AM   #1
Regular Crew
 
Join Date: Jul 2006
Location: UK
Posts: 99
wmv render problems

I am using Sony Vegas 5. In the past I have rendered many files to wmv without any problems. These typically play at maybe 800 to 2000Kbits /sec in windows media player. I have now rendered a file to wmv and it comes out at >10,000 kbits /sec when played. The result is a great deal of posterising. My settings have not changed from previous successful attempts. Has anybody got any ideas what could be going wrong ?
Mark Howells is offline   Reply With Quote
Old June 25th, 2007, 09:29 AM   #2
 
Join Date: Jan 2004
Location: Stockton, UT
Posts: 5,648
Are you rendering to the same resolution? It would be odd if they play sweetly at 2Kpbs but are macroblocking at 10Kpbs.
__________________
Douglas Spotted Eagle/Spot
Author, producer, composer
Certified Sony Vegas Trainer
http://www.vasst.com
Douglas Spotted Eagle is offline   Reply With Quote
Old June 25th, 2007, 10:22 AM   #3
Regular Crew
 
Join Date: Jul 2006
Location: UK
Posts: 99
Thanks for the reply Douglas. I'm not sure what you mean, though. All I know is that when I play the wmv in windows media player and it shows at the bottom "playing xxxx kbits/sec", the rate is well over 10,000. One render was 26,000. This seems extraordinary as most of the my wmv files and others I have viewed are a few thousand at best. And I have done nothing different from what I normally do ie select the default wmv settings, change to best and audio to 128.

I am completely confused. The result, as I mentioned, is a swirl of posterisation.
Mark Howells is offline   Reply With Quote
Old June 26th, 2007, 03:21 AM   #4
Regular Crew
 
Join Date: Jul 2006
Location: UK
Posts: 99
I have now found that it plays fine at home, where I think I'm using windows media player 10, but shows these major posterisation/blocky issues at work (windows media player 9). However, it can't be an issue with the version of windows media player as I have watched many of my wmv's at work before.

Could the problem be that my hard disk is close to full capacity ? Could this explain why the bitrate in the file properties is so ridiculously high ?
Mark Howells is offline   Reply With Quote
Old June 27th, 2007, 03:30 AM   #5
Regular Crew
 
Join Date: Jul 2006
Location: UK
Posts: 99
Latest update

I rendered my edited film in 2 minute segments to wmv using video VBR. This identified at what point the bitrate, when played, exceeded 10,000. I found that in most cases the playback bitrate was as expected, around 500 - 800 kbps. The problem area was right at the end of the film when the footage goes to a few seconds of tv static. This was achieved using the extreme noise and B&W filters. The bitrate shot up to 20,000.

I then changed the video settings for this segment to 2-pass cbr 1Mb. Result !! The bitrate came to a more acceptable level. All this was at home, using wmp 10.

I then re-rendered the whole film to 2-pass cbr 1Mb and was horrified when the playback bitrate again showed around 20,000. Demoralised, I copied the segments that worked using vbr onto a cdr together with this re-rendered whole film and took the disc to work.

Work uses windows 2000 and is therefore limited to wmp9. Playback here is where the problems have arisen. When I played the whole film, rendered with 2-pass cbr 1Mb, all the posterisation had gone, even though the playback bitrate was showing 20,000 kbps. When I played the vbr segments the posterisation was back, even though the playback bitrate was an acceptable 500-800 kbps.

I would really appreciate if anyone can rationalise these findings as I am stumped.

1. It appears that wmp9 does not like video vbr but I know all of my previous films have been rendered using video vbr and played back with no issues.
2. Why if the render is set at a constant rate of 1Mb does it result in a bitrate shown of 20,000 kbs.
Mark Howells is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Windows / PC Post Production Solutions > What Happens in Vegas...

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 01:14 AM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network