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I-Leadonline
I-Leadonline
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Random Render Line Glitch in AE CS6

Aug 13, 2012 4:32 PM

Tags: #line #video #frame #after_effects #output #bar #render #glitch #random #ae #motion #cs6 #quicktime #compression #warp #tracking #warp_stabiliser #stabiliser

Hey Adobe Community!

 

Although I have been quite happy with After Effects CS6, I have been running into some render glitches which are giving me real problems (whether CS6 is the culprit or not I don't know). On a number of jobs I am currently working on, the renders out of AE have strange bars that appear for about one frame at random times throughout the rendered clip. I can't find any pattern to the timecode or the screen location when they appear. Take a look below at the two pictures below for examples.

 

Quick note: This problem appears to be similar in some respects to the issue in this discussion (http://forums.adobe.com/message/4409423#4409423). Just thought I would post it for reference.

 


 

#1

045A_04a_OR_01_01_00027.png

#2

RenderProblemEx1_00215.png

 

Here is some information about the two clips.

 

Clip for picture #1

Time: 2:06 (two seconds and six frames)

Output: Quicktime

Compression: None

Composition: There is 1 mask and some motion tracking

 

Clip for picture #2

Time: 20:06

Output: Quicktime

Compression: None

Composition: Utilizing the "Warp Stabilizer" in order to smooth camera movement.

 

This is obviously a problem that cannot continue since AE is a huge part of my work. I really appreciate any insight you can provide on this problem.

 

I know I have probably left out information that you would like, so if there are any questions please feel free to ask.

 

Thanks!

-Barrett

1727 Views   15 Replies   Latest reply: xxtapam, Oct 2, 2012 12:49 PM
 
Replies
  • Mylenium
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    1. Mylenium,
    Aug 14, 2012 3:18 AM   in reply to I-Leadonline
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    Looks like QT decode errors. Have you tried converting the source files externally in anotehr program?

     

    Mylenium

     
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  • I-Leadonline
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    2. I-Leadonline,
    Aug 14, 2012 8:01 AM   in reply to Mylenium
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    I have used them in Premiere Pro but have not come accross the same problems.

     

    If it was a decoding error, wouldn't it show up as I'm working on the composition in AE (not just in the render)?

     
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  • Szalam
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    3. Szalam,
    Aug 14, 2012 8:11 AM   in reply to I-Leadonline
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    Try using the Adobe Media Encoder to put them in a different format. Quicktime with the PNG codec at high quality is lossless, but with relatively small file sizes compared to what the animation codec would be with footage like that.

     

    What format are you rendering to from After Effects? And what codec are the source clips?

     
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  • I-Leadonline
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    4. I-Leadonline,
    Aug 14, 2012 8:34 AM   in reply to Szalam
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    Ok, I'll give Encoder a shot with your recommended settings.

     

    To answer your questions Szalam, the original footage came from a Canon 5D Mk2 and a 7D which would put both as QT with the H.264 codec. I am rendering out of AE as a QT file with no compression. Although the file sizes are big, I don't want to lose any quality.

     
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  • I-Leadonline
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    5. I-Leadonline,
    Aug 14, 2012 10:14 AM   in reply to I-Leadonline
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    Ok, update on the situation.

     

    I took Szalam's idea and converted the source footage (QT H.264) in Media Encoder to a Quicktime format with the PNG codec at it's best quality. After replacing the source footage with the converted footage I rendered out two versions of the file. One as a Quicktime with no compression and the other as Quicktime with PNG compression.

     

    The bars appear once again in the uncompressed render but not in the compressed one. Frustrating.

     

    So it appears that the problem happens when the composition is being rendered uncompressed. I want to keep all the footage I work with for clients lossless, but that's not going to happen if these bars keep showing up.

     

    Where should I go from here?

     
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  • I-Leadonline
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    6. I-Leadonline,
    Aug 14, 2012 4:44 PM   in reply to Szalam
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    Another update, I rendered out with the Animation codec and still got the bars.

     

    Thoughts?

     
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  • Rick Gerard
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    7. Rick Gerard,
    Aug 14, 2012 7:47 PM   in reply to I-Leadonline
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    If that's the case I suspect the capture codec. Try transcoding before you bring the footage into AE.

     
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  • Szalam
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    8. Szalam,
    Aug 14, 2012 8:39 PM   in reply to I-Leadonline
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    The PNG codec (at high quality) is a lossless codec. It is the same quality as uncompressed. Use it with no fear.

     
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  • BenMarkus
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    9. BenMarkus,
    Aug 17, 2012 2:47 PM   in reply to Szalam
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    Premiere and AE should be able to handle H.264 clips directly out of the 5D and 7D without transcoding, but if you're still working with the original aquisition codec after switching to another program in the pipeline then that might be the problem.  In that case, you might be forced to transcode your entire Premiere project to another lossless production codec using AME, which will give you the same quality as any other lossless codec.  This is actually a step that a lot of editors take before doing anything with their footage, if they know it's going to go through several programs down the line.  And if I understand correctly, Uncompressed QTs and high quality PNG QTs are both actually compressed.  However, they are compressed with lossless formats.  As Szalam said the QT PNG codec is the same quality as an Uncompressed QT, although I'd also suggest Apple ProRes 422 (HQ) if you have it.  Uncompressed 10 bit, Uncompressed 8 bit and Animation are lossless, but the file sizes will be huge.  If you have Black Magic you could also try that.

     
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  • xxtapam
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    10. xxtapam,
    Sep 13, 2012 1:17 AM   in reply to Mylenium
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    I'm using AE CS6 and I have the exact same problem here. I'm experiencing random glitches here.

    I'm exporting in QuickTime format (Animation compression) with or without alpha and all the footage in the composition is generated by AE, no videos or pictures.

    An example.

    f###ing glitch.jpg

     

    I've tried everything. I can export the same composition 3 times and one has no glitches and two have them in diferent frames,

    The problem occurs in my two computers,

     
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  • cornelius_3
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    11. cornelius_3,
    Sep 16, 2012 6:11 PM   in reply to xxtapam
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    Guys,

       I had the same problem with video glitches.   After disabling "Render Multiple Frames Simaltaneously" I was able to elimintate the video problems. So give that a try.

     

    once again:

     

    POSSIBLY FIX:

       Goto After Effects Preferences

     

         Memory & Multiprocessing tab

     

    DESELECT "Render Multiple Frames

     

     

    Screen Shot 2012-09-14 at 11.55.57 AM.png

     
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  • xxtapam
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    12. xxtapam,
    Sep 16, 2012 11:22 PM   in reply to cornelius_3
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    I don't have the multiple frames rendering activated so... :-(

     
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  • cornelius_3
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    13. cornelius_3,
    Sep 17, 2012 8:25 AM   in reply to xxtapam
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    xxtapam wrote:

     

    I don't have the multiple frames rendering activated so... :-(

    You computer also renders 1 good time out of every 3, correct?  For me, no matter how many times I rendered out that composition, I would get the same glitch with a slight modification in the same place.  It takes over about 6 frames at a time.  Now I am also running a 2012 15" MacBook Pro (Non-Retina), I am not sure if you are on a PC or MAC, but in looking at the Pictures above all of our glitches look completely different.  I am wondering if it has to due with an After Effects issue with our individual Graphics Cards, vs, a specific setting.  Does anyone else agree with my conclusions?  And if so, this is obviously an issue for Adobe.

     
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  • superduperfi75
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    14. superduperfi75,
    Sep 26, 2012 11:30 AM   in reply to cornelius_3
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    I have been having the same problem on a MBP Retina. The problem does seem to stem from a Quicktime decode error.  I switched to VLC  as the default media player and was able to view movies without the scanline glitches.

     
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  • xxtapam
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    15. xxtapam,
    Oct 2, 2012 12:49 PM   in reply to cornelius_3
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    I'm on windows with a Gforce GT240. The problem appears in Mov or Avi formats. Not in h264.

     
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