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movie I made with some video editing software on my computer at home. I choose to export it in
Quicktime MPEG4 format. One of the options is "Key Frame every ___ ". What value should I put here? Well, I am not actually looking for a value in this example of course, but having an example like this I think would be quite benificial to many people. What does it mean to key frames every 24 frames? What does it mean to key frames at every time line marker and how does that effect my output if I am outputting to MPEG4, AVI, SWF, etc.?
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entire image is stored), why they must generated (drastic visual changes in lossy compression), and the creation of arbitrary key frames (to allow the viewer to seek within the video stream). However I'm afraid my wording may be clumsy and redundant. Please feel free to clean it up if you are so inclined. --
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particular frame as a "key frame" will always require at least as many bits, and typically many more bits, as encoding that same frame as a P frame or a B frame. So to get maximum compression, you want to go as long as possible between key frames. However, most players can only fast-forward or reverse (
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I visited this article to see what it had to say about key frames as they pertain to video compression, and found the article didn't cover the topic at all. I've added a section about video compression that I hope is not terribly confusing. I tried to cover what key frames are (a frame in which the
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The thumbnails for Motion_Animated.gif and Color_Animated.gif are animated, but the thumbnails for Shape_NoHint.gif and Shape_Hinted.gif are not. (The full resolution version of all four images are all animated, as intended.) This is likely either an oversight or a mistake of some kind that I would
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The key frame rate should not visually effect the output at all. If you play back 2 movies, encoded from the same source with 2 different key frame rates, it should be difficult to tell the difference between either movie and the original (assuming you have a sufficient quality setting). Encoding a
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It appears to me that the "Shape transformations USING shape hints" example doesn't correctly show the start and end points of points "b" and "d." As I view the animation, it seems that they are reversed. That is, if you watch point b, it ends up at the bottom of the arrow (currently labeled "d"),
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Please delete the section and direct the reader to video compressions as the section is not really how it's done or what it's for. Intra-frame is a a type of compression (one of two) and you are mixing up keyframes as used for video compressions and keyframes that are used for computer animation
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I think we need to include what key framing does. I mean, for myself, I am new to video and I am trying to learn as much as I can before I go out and start to ask questions. I now know what key framing is (thank you wikipedia), but how does it affect my output? For example: I want to export a
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A large portion of the article reads like it's out of some sort of manual or possibly advertisement for Adobe Flash. Maybe this stuff could move to a section "Keyframing in Adobe Flash", or something, since it really doesn't make sense to relate everything to this piece of software.-
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Keyframing can apply to more than motion (ie
Movement). This especially applies to keyframing in modern animation software. For example, in Flash, the tint (color) of the object can be animated by defining two keyframes and creating a tween. Keyframing can basically be used for
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I've wanted to make the relevant changes, but I figured it'll be better to get the opinion of others first, as making this change will mean making modifications to the entire page. So, I need your opinion on whether or not the changes should be made. —
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Thank you very much for your contribution! However, I'm not very sure as to whether the content should be placed here. Please correct me if I'm wrong, but I was under the impression that Key Frames with regards to video encoding is better known as an
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The article is well-researched and well presented. It keeps the reader engaged through out. I would like to suggest including few more details on keyframe intervals for the benefit of beginners. --
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Hmm... No replies yet? My plan now is this. I'd go ahead and make the changes. Anyone who drops by, please edit as you deem fit. (i'll begin work now) —
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Does that answer your question? If so, please improve this article. Feel free to copy my text into the article, then edit it for clarity.
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which can be variably placed as opposed to the GOPs which are only five frames and used universally in all temporal compression.
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The "completed" image for "Shape transformations USING shape hints" appears to be unanimated. Is anyone able to fix this?
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prior to 1 November 2008 and incorporated under the "relicensing" terms of the
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like to see corrected. But I don't have the know-how to fit it myself.
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Does anyone know why this article is being visited so much right now?
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Yes. That is true. I'll look into it. Thanks for pointing it out. —
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Excellent presentation, more on keyframe intervals, if possible
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and d becomes the second point down (currently labeled "b").
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Copyright issues, this is a plagiarism from
Dictionary.com
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kind of animation, but this article limits it to motion.
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on
Knowledge. If you would like to participate, you can
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Using shape hints flash animiation example mis-labeled?
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the article attached to this page, help out with the
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