如何在现有视频上加水印

问题描述

我不知道应该使用哪个库.请帮助我获取该库，或者如果可用的话，请提供其他任何来源

I dont know which library should I use. Please help me to get the library or please provide any other source if available

// this demonstrates one way of watermarking a video clip...
string outputFile = "WatermarkVideoClip.wmv";

using (ITimeline timeline = new DefaultTimeline(15))
{
    // greate our default audio track
    timeline.AddAudioGroup().AddTrack();

    // add a video group, 32bpp, 320x240 (32bpp required to allow for an alpha channel)
    IGroup videoGroup = timeline.AddVideoGroup(32, 320, 240);

    // add our default video track
    ITrack videoTrack = videoGroup.AddTrack();

    // add another video track, this will be used to contain our watermark image
    ITrack watermarkTrack = videoGroup.AddTrack();

    // add the video in "transitions.wmv" to the first video track, and the audio in "transitions.wmv"
    // to the first audio track.
    timeline.AddVideoWithAudio("transitions.wmv");

    // add the watermark image in, and apply it for the duration of the videoContent
    // this image will be stretched to fit the video clip, and in this case is a transparent gif.
    IClip watermarkClip = watermarkTrack.AddImage( "testlogo.gif", 0, videoTrack.Duration);

    // add a alpha setter effect to the image, this will adjust the alpha of the image to be 0.5
    // of it's previous value - so the watermark is 50% transparent.
    watermarkClip.AddEffect(0, watermarkClip.Duration, StandardEffects.CreateAlphaSetterRamp(0.8));

    // add a transition to the watermark track, this allows the video clip to "shine through" the watermark,
    // base on the values present in the alpha channel of the watermark track.
    watermarkTrack.AddTransition(0, videoTrack.Duration,
                            StandardTransitions.CreateDxtKey(DxtKeyTypes.Alpha, null, null, null, null, null),
                            false);
    using (
        // render it to windows media
        IRenderer renderer =
            new WindowsMediaRenderer(timeline, outputFile, WindowsMediaProfiles.HighQualityVideo))
    {
        renderer.Render();
    }
}

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