Only by actually modifying the video file itself to take advantage of the handler's expectation can one bypass this problem and always have the handler generate the thumb you want. Yes, with an appropriately designed app, you might could externally modify/replace those thumbs with something else, but - if the database either gets corrupted or manually or automatically forced to refresh - ALL non-default thumbs get wiped out and replaced with their default thumbs, thereby UNDOing all your work! These usually exist in either the folder of the media files in question, or in a user's central storage folder (.app data, blah blah.).Ĥ. Yes, it creates those thumbs and puts them into the thumbs.db, ehthumbs.db, or NTFS alternate-data-stream sections of the file itself. Most, if not all, thumbnail handlers extract the image from either the very first frame of video, or the first Xth frame (can sometimes be set in the registry tweaks).ģ. OS uses "Thumbnail Handlers" as intermediaries/plugins which which to generate, manage & display thumbnails.Ģ. I read your link and it just confirmed what I understood about thumbs.ġ. Sometimes in order to work with it, you have to do bizarre stuff in turn. Yeah, well MS does MANY things that are bizarre. To suggest that the OP edits the clip in order to insert an image that is then extracted is, frankly, bizarre. Scott Really? As the OP assumes, these images may initially originate from within a video file but, ultimately, they are stored as images somewhere. There must be an easier way of doing this? Some kind of "video registry hack" perhaps? What's an NLE btw? I was hoping I could just replace (preferably) the beginning frame of the video with my own picture seems the most "promising" (and im a bit familiar with using it) but that would mean I may have to re-encode everything which would take time and a lot of processing power (dunno if it'll work on m4vs) It just seemed random.i guess it was dependent on how the original video was encoded. Uhmmm.i do know the video thumbnails came from the video file itself.although, I don't really understand (like you said) which video frame at some point becomes the "thumbnail" eventually. This does NOT include binary joining (even if on the surface, it looks like it works). When subsequently saving this, it will of course re-encode your video (which is a bad thing), unless you use proper lossless joining methods (e.g. The only way to get your pic to be used as the thumbnail is to figure out WHICH frame(s) is shown in the preview and use an NLE to insert a picture - AS VIDEO - into your existing video at that framecount point. It may store it in a separate cache file, but it is BASED on the contents of the video/movie file, so you can't "replace" a thumbnail with something external to the video/movie. Thumbnails are meant to show you a low-rez preview poster of some point in a video/movie. I don't think you understand what a thumbnail is (comes from).
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