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Thread: How to get an image to flash frequently throughout an existing video?

  1. #1

    Default How to get an image to flash frequently throughout an existing video?

    Dear Digital Director's,

    This seems like an awesome group of people with a whole lot of information on video editing!

    I just landed on this page, and wanted to ask you, the experts, if you would please take a look at this challenge?

    The scenario is as follows:
    You have an already existing hour++ long video stored on your computer.
    You have a picture (or a handful of pictures) that you LOVE stored on your computer.

    Now, you want to get this/these images to flash for something like 5-10 milliseconds, like every second, or every seventh frame, throughout the whole video.

    What would the most efficient way to get this done?

    The result is intended to be a viewable copy of the original video, with subliminal pictures flashing unnoticed throughout the entire video.
    This is intended for personal use



    Thank you very much in advance for your advice and recommendations!
    Last edited by plurfect; 10-03-2013 at 06:59 PM.

  2. #2

    Default

    Here are two factors worth considering.
    The shortest time an image can appear depends on the video's framerate, or 'frames per second'. For example, at 30fps; each frame occupies 33.33ms. At 60fps a frame lasts 16.66ms. So, to have a video where the shortest frame is 5ms, requires a 200fps video, and a playback system which can play it, and eyes which can detect it.
    The second factor is whether you require the inserted graphic to overlay the original video, or to insert the frames (thus affecting the playtime and sync with any audio track).

  3. #3

    Default

    Quote Originally Posted by TimAndrews View Post
    Here are two factors worth considering.
    The shortest time an image can appear depends on the video's framerate, or 'frames per second'. For example, at 30fps; each frame occupies 33.33ms. At 60fps a frame lasts 16.66ms. So, to have a video where the shortest frame is 5ms, requires a 200fps video, and a playback system which can play it, and eyes which can detect it.
    The second factor is whether you require the inserted graphic to overlay the original video, or to insert the frames (thus affecting the playtime and sync with any audio track).

    Thank you, Tim Andrews.

    As you may understand, I'm not too proficient in this art

    FPS is 30 for this video.
    Would flashing the image every 30th frame (overlaying the original) of the video be possible?

  4. #4
    Join Date
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    I can acheive this in Sony Vegas by placing the first still image at frame 1, (it is one frame in length).
    Then insert an 'empty event' (edit menu), make that 29 frames long and join it to the first frame (which is the image).
    This gives you a 30 frame clip that will only show the first frame, then show transparently for the next 29 frames, allowing the track underneath it to show through.
    Now 'copy' the two parts that make up the 30 frames (using shift key). Place curser at frame 30 (or 31?). Use 'paste repeat' to repeat those 30 frames for the length of the film, or for as long as you need before changing the first image and repeating the process.

  5. #5

    Default

    Quote Originally Posted by Stripe View Post
    I can acheive this in Sony Vegas by placing the first still image at frame 1, (it is one frame in length).
    Then insert an 'empty event' (edit menu), make that 29 frames long and join it to the first frame (which is the image).
    This gives you a 30 frame clip that will only show the first frame, then show transparently for the next 29 frames, allowing the track underneath it to show through.
    Now 'copy' the two parts that make up the 30 frames (using shift key). Place curser at frame 30 (or 31?). Use 'paste repeat' to repeat those 30 frames for the length of the film, or for as long as you need before changing the first image and repeating the process.

    Wonderful!!

    That sounds like a solution, thank you so much

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