Intermittent flash frames/garbage in .m4v project render 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 October 10th, 2012, 07:44 AM   #1
Major Player
 
Join Date: May 2008
Location: Atlanta GA
Posts: 211
Intermittent flash frames/garbage in .m4v project render

I'm stumped and I hope you can help; my client needs a looping video for display on a kiosk at a franchise meeting. The file format I've decided on will be a 1280x720 .mp4 video that will loop in Quicktime on a PC connected to the 50" LCD display. Here's the problem I'm running into; the assets were given to me as .m4v files that were ripped from some DVDs using Handbrake. (Note: the source files were created internally by employees using a variety of video cameras and smart phones). The file size is actually less than SD (652x376) so I cannot size them up to 1280x720 without it looking like total crap. Since there is an "art" theme for the event, I came up with a simple solution; I found a stock image of a painter's canvas for the background, and a gilded picture frame that creates a smaller "window" for display of the video. I dropped the .m4v files into the timeline, used Pan/Crop to size them to the window, and I thought I was done. WRONG ...

There are some sync or display issues with these files that show up in the preview window and also in the final render. First, if I shrink the size of my preview window, the image disappears. This is annoying because I have 4-5 different video and audio tracks in the timeline, and I can't view them all and the preview at the same time. Second, when I render the file I get intermittent "flash frames" of diagonal lines of static garbage in a rainbow of colors. It happens usually near transitions in the video clips with sharp contrast, like a fade to black or up from black. One section that is supposed to be in black and white gets completely scrambled.

Could anyone shed some light on what's happening here?
Sam Renkin is offline   Reply With Quote
Old October 10th, 2012, 07:45 AM   #2
Major Player
 
Join Date: May 2008
Location: Atlanta GA
Posts: 211
Re: Intermittent flash frames/garbage in .m4v project render

Sorry, should have added my hardware/software setup. Vegas Pro 11, Core i7 w/Windows 7 and 8GB RAM.
Sam Renkin is offline   Reply With Quote
Old October 10th, 2012, 07:59 AM   #3
Major Player
 
Join Date: May 2008
Location: Atlanta GA
Posts: 211
Re: Intermittent flash frames/garbage in .m4v project render

Also, FYI the pixel size of the source files is 652x376, 624x368, 602x382, and 640x366. NO IDEA how they came up with these!!
Sam Renkin is offline   Reply With Quote
Old October 10th, 2012, 10:22 AM   #4
Sponsor: JET DV
 
Join Date: Dec 2001
Location: Southern Illinois
Posts: 7,873
Re: Intermittent flash frames/garbage in .m4v project render

When I've had to use odd files, I've often started a new project, set the properties to match the clip, and then render to a known good format (which is typically DV-AVI for me). Then I can use the new render and not have to worry about issues.
__________________
Edward Troxel [SCVU]
JETDV Scripts/Excalibur/Newsletters
Edward Troxel is offline   Reply With Quote
Old October 10th, 2012, 10:28 AM   #5
Major Player
 
Join Date: May 2008
Location: Atlanta GA
Posts: 211
Re: Intermittent flash frames/garbage in .m4v project render

Thanks Ed - actually I've tried that with rendering new MP4 files, but the problem persists. Do you know of a situation where resizing the video using pan/crop would introduce this kind of issue?

You might know the answer to this question as well - my project output size must be 1280x720 because of the display media. So, is there a way to get these clips to appear at their native pixel size when I place them on the timeline? In other words, how do I keep Vegas from automatically enlarging them to fill the frame? I'd like to place them on screen in my project at their actual pixel size. Let me know?

Sam
Sam Renkin is offline   Reply With Quote
Old October 10th, 2012, 10:32 AM   #6
Sponsor: JET DV
 
Join Date: Dec 2001
Location: Southern Illinois
Posts: 7,873
Re: Intermittent flash frames/garbage in .m4v project render

Vegas will automatically expand them full size. I use the "Logo Resize" option in Excalibur to do this. It will resize and image back to it's original size on the screen.
__________________
Edward Troxel [SCVU]
JETDV Scripts/Excalibur/Newsletters
Edward Troxel is offline   Reply With Quote
Old October 10th, 2012, 02:30 PM   #7
Inner Circle
 
Join Date: Sep 2003
Location: Portland, Oregon
Posts: 3,259
Re: Intermittent flash frames/garbage in .m4v project render

Quote:
Originally Posted by Sam Renkin View Post
...actually I've tried that with rendering new MP4 files, but the problem persists...
MP4 can be a pretty poor editing codec. Choose a good D.I. codec like Cineform, DNxHD, Lagarith, etc. In this case, as Edward suggested, you're working at SD resolutions and smaller, so, DV-AVI would make an excellent editing codec.
__________________
30 years of pro media production. Vegas user since 1.0. Webcaster since 1997. Freelancer since 2000. College instructor since 2001.
Seth Bloombaum 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 07:19 AM.


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