How can I turn a series of images into a video using JCodec?

Question

I\'m trying to use JCodec to turn a series of images into a video inside of a Java SE desktop application. The few methods I\'ve tried all resulted in a video that Windows

Answer 1

I had a lot of issues with jcodec's RgbToYuv420() transform.
I used my own function to transform my RGB BufferedImage to Yuv420.
One issue I had was that RgbToYuv420 averages the computed upix and vpix values, and it was causing the colors in my mp4 to be all wonky.

// make a YUV420J out of BufferedImage pixels
private Picture makeFrame(BufferedImage bi, ColorSpace cs)
{   
    DataBuffer imgdata = bi.getRaster().getDataBuffer();
    int[] ypix = new int[imgdata.getSize()];
    int[] upix = new int[ imgdata.getSize() >> 2 ];
    int[] vpix = new int[ imgdata.getSize() >> 2 ];
    int ipx = 0, uvoff = 0;

    for (int h = 0; h < bi.getHeight(); h++) {
        for (int w = 0; w < bi.getWidth();  w++) {
            int elem = imgdata.getElem(ipx);
            int r = 0x0ff & (elem >>> 16);
            int g = 0x0ff & (elem >>> 8);
            int b = 0x0ff & elem;
            ypix[ipx] = ((66 * r + 129 * g + 25 * b) >> 8) + 16;
            if ((0 != w % 2) && (0 != h % 2)) {
                upix[uvoff] = (( -38 * r + -74 * g + 112 * b) >> 8) + 128;
                vpix[uvoff] = (( 112 * r + -94 * g + -18 * b) >> 8) + 128;
                uvoff++;
            }
            ipx++;
        }
    }
    int[][] pix = { ypix, upix, vpix, null };
    // old API
    // return new Picture(bi.getWidth(), bi.getHeight(), pix, ColorSpace.YUV420J);
    return Picture.createPicture(bi.getWidth(), bi.getHeight(), pix, ColorSpace.YUV420J);
}