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alistair.strachan
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Distorted when projected - why?

May 31, 2012 2:30 AM

Tags: #rendering

I recently made a short film, and it played fine in Quicktime on my iMac.  When it was video projected at a film night however the image was distorted - it had horizontal lines running through it and the projector seemed to struggle with blocks of colour.  This was a domestic level projector, and the film was running off a MacBook Pro.

 

I am intending to show it again at a festival and would like to know what I can do to render it best for projection.

 

My current export settings are:

 

Format: Quicktime

 

Preset: PAL DV

 

Output: 720 x 576  25 fps, lower, quality 100

 

Video codec: DV25 PAL

 

No frame blending

 

Maximum render quality

 

Thanks for any advice

452 Views   7 Replies   Latest reply: R4yMoNd, Jun 2, 2012 8:48 PM
 
Replies
  • ECBowen
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    1. ECBowen,
    May 31, 2012 7:17 AM   in reply to alistair.strachan
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    How did you have the Laptop connected to the Projector and what is the model of the Projector? Did you use Quicktime to play the film out the Projector?

     

    Eric

    ADK

     
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  • alistair.strachan
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    2. alistair.strachan,
    May 31, 2012 7:29 AM   in reply to ECBowen
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    I'm not sure how laptop and projector were connected, but I do know that all the other films shown that evening were fine - just mine was distorted.  Yes - it would have been playing on Quicktime.  Thanks

     
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  • ECBowen
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    3. ECBowen,
    May 31, 2012 9:11 AM   in reply to alistair.strachan
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    Well unfortunately the output mode and player would have decided this. The lines are likely from interpolation which means the player was dealing with the material as Interlaced or the player was outputting Interlaced and the Projector was displaying in Progressive. You can also get that from Interpolating 25 frames to 30 frames if the Player is playing everything in NTSC and your material is in PAL. Often times differences in Codecs will cause that to not interpolate correctly in the player.

     

    Eric

    ADK

     
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  • alistair.strachan
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    4. alistair.strachan,
    May 31, 2012 3:01 PM   in reply to ECBowen
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    Thanks Eric.  I might try burning the film as a DVD, rather than playing it as a quicktime file.  I'm thinking that will output the file as a more standard form for projecting.

     

    Alistair

     
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  • ECBowen
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    5. ECBowen,
    May 31, 2012 3:08 PM   in reply to alistair.strachan
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    That is the best way to resolve this issue since DVD Decks are firmware programmed to handle this interpolation very well. Software players have to many version differences which include codecs that can run into issues like you ran into.

     

    Eric

    ADK

     
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  • alistair.strachan
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    6. alistair.strachan,
    Jun 1, 2012 3:18 AM   in reply to ECBowen
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    Thanks for your help Eric

     
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  • R4yMoNd
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    7. R4yMoNd,
    Jun 2, 2012 8:48 PM   in reply to alistair.strachan
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    i always avoid playing multimedia or video in .mov format during my live event.

     

    most of the time it will stuck, stutered, out of sync, etc (especially if the file size is large) can't afford to face that kind of problem.

     

    what i always do is to convert it to .mp4 with good quality format and play it from VLC.

     

    double check before i run it from start to the end.

     
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