Latest post Tue, Sep 7 2010 10:32 PM by Marianna. 7 replies.
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  • Mon, Sep 6 2010 11:08 PM

    Merge 2 or more video tracks?

    Hi,

    I had a camera mounted on a tripod and want to merge 2 or three video tracks (with the effect being the background staying the same but people in the foreground moving around). Is there a way to do this?

     

    Will

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  • Mon, Sep 6 2010 11:28 PM In reply to

    Re: Merge 2 or more video tracks?

    Use the Superimpose effect.

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  • Tue, Sep 7 2010 12:09 AM In reply to

    Re: Merge 2 or more video tracks?

    You'll find it in the blend group of effects.

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  • Tue, Sep 7 2010 12:34 AM In reply to

    • Marianna
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    Re: Merge 2 or more video tracks?

    However this will only work well with 2 tracks.
    The V1 with the scene and no people.
    The V2 with the scene and the people.
    If you add a V3 track with more people..... you have to sacrifice some of the transparency of the V2 and V3 layers in order to see the V1 track.

    You would need to key out individual people after adding more than V1 and V2.

    Here is a tutorial I made about using this effect..............

    Maybe it will give you some ideas

    Regards,
    Douglas

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  • Tue, Sep 7 2010 12:40 AM In reply to

    • Marianna
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    Re: Merge 2 or more video tracks?

    Here is a follow up tutorial on using the vector tools to create masks.

    You would need to create masks on the V3 and above tracks.

    But then you will run into problems when one person on a layer crosses the path of another person on another layer.

    Regards,
    Douglas

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  • Tue, Sep 7 2010 1:26 AM In reply to

    • Sylvain P
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    Re: Merge 2 or more video tracks?

    Interesting tutorial Douglas!

     

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  • Tue, Sep 7 2010 10:00 PM In reply to

    • Joe M
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    Re: Merge 2 or more video tracks?

    Or... you could take v1 and v2 (superimposed) and render them into a one new video clip...

    Then, use the newly rendered video clip as the background (v1) and add a new layer on top (v2).

    Whether or not this works depends upon how the characters are positioned and move within each video track relative to the background.

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  • Tue, Sep 7 2010 10:32 PM In reply to

    • Marianna
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    Re: Merge 2 or more video tracks?

    Joe M:

    Or... you could take v1 and v2 (superimposed) and render them into a one new video clip...

    Then, use the newly rendered video clip as the background (v1) and add a new layer on top (v2).

    Whether or not this works depends upon how the characters are positioned and move within each video track relative to the background.

    Joe,

    I don't think it is so simple.

    I will see if I have a moment to make a short explanation tutorial later today.
    In the meantime, let me try and explain verbally.

    Imagine a V1 track with a fixed back ground and a big red circle moving across it.

    Add a V2 track with the same background and a big blue rectangle moving across it.

    To be able to view the big blue rectangle you will have to make the V2 track 100% opaque.
    If you make the V2 track e.g. 50% opaque, you will see a 50% "ghosted" big blue rectangle moving over the background which is showing a 50% "ghosted" big red circle.

    So the V2 track has to be 100% opaque to allow the big blue square to be seen at 100%........... in doing that you block out the V1 track completely.

    Hope that makes sense.
    If not I will see if I can post a visual explanation later today.

    REgards,
    Douglas

     

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