FFMPEG Dummy Picture Pattern

最新推荐文章于 2025-07-06 20:29:47 发布

翻译最新推荐文章于 2025-07-06 20:29:47 发布 · 888 阅读

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#ffmpeg #yuv

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本文提供了一个使用FFmpeg库填充YUV图像的示例代码，通过该示例可以了解如何创建并填充YUV格式的图像帧，这对于音视频处理及编码任务具有参考价值。

From ffmpeg/doc/examples/muxing.c

/* Prepare a dummy image. */
static void fill_yuv_image(AVFrame *pict, int frame_index,
                           int width, int height)
{
    int x, y, i, ret;

    /* when we pass a frame to the encoder, it may keep a reference to it
     * internally;
     * make sure we do not overwrite it here
     */
    ret = av_frame_make_writable(pict);
    if (ret < 0)
        exit(1);

    i = frame_index;

    /* Y */
    for (y = 0; y < height; y++)
        for (x = 0; x < width; x++)
            pict->data[0][y * pict->linesize[0] + x] = x + y + i * 3;

    /* Cb and Cr */
    for (y = 0; y < height / 2; y++) {
        for (x = 0; x < width / 2; x++) {
            pict->data[1][y * pict->linesize[1] + x] = 128 + y + i * 2;
            pict->data[2][y * pict->linesize[2] + x] = 64 + x + i * 5;
        }
    }
}