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Anyone knows what part of registry is related to this film frame? I installed and uninstalled mp4box, avidemux, YAMB try to set default aspect ratios but failed, and now I have a new problem.

mp4 not showing film frame

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I don’t understand what you problem is; I see thumbnails for both of the video files in your screenshot. Are you asking how to get the sprocket perforations in the thumbnail? (I would think most people would want to know how to get rid of them.) –  Synetech Sep 19 '12 at 16:05

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If you are asking about getting the sprocket perforations on the thumbnail, I would suggest using Icaros. It lets you specify file types to generate thumbnails for (including various video formats for which thumbnails are not generated by default). If you add .mp4 to its list, then it may change how the thumbnail is generated (i.e., use WMP to generate it like is done for .wmv files).

You can also customize the appearance of video thumbnails with Thumbnailer Lite:

Thumbnailer Lite

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Also, there is a program that can customize various aspects of video previews (including sprocket perforations), but I just cannot seem to find it. I have a copy of it somewhere and will find it tonight. –  Synetech Sep 19 '12 at 16:19
    
General observation: what I can't understand is, when one is talking about thumbnails that by definition are quite small, why would one want sprocket perforations to obstruct what little can be seen of the actual image? –  Karan Sep 19 '12 at 16:49
    
@Karan, consistency? –  Synetech Sep 19 '12 at 17:04
    
Hmm, I guess, although I agree with your comment above, that most people would actually want to know how to get rid of them. –  Karan Sep 19 '12 at 17:06
    
BTW, thanks for the Icaros suggestion, but do you happen to know if it will work properly in Windows 8 as well? –  Karan Sep 19 '12 at 17:08

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