Question

很抱歉，由于信誉不佳，我仍然无法发布我的问题的图片。

我使用ffmpeg函数将已解码的帧从YUV转换为RGB24，但颜色和结果图像严重失真。以下是我的代码片段，帧宽和高度为（176,144）

len = avcodec_decode_video2(c, picture, &got_picture, &avpkt);
    if (got_picture) {
            //...

    AVFrame *pFrameRGB = avcodec_alloc_frame();
    // Determine required buffer size and allocate buffer
    int numBytes=avpicture_get_size(PIX_FMT_RGB24, c->width, c->height);
    uint8_t *buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
    avpicture_fill((AVPicture *)pFrameRGB, buffer, PIX_FMT_RGB24, c->width, c->height);

    struct SwsContext *img_convert_ctx = sws_getContext(c->width, c->height, PIX_FMT_YUV420P, c->width, c->height, PIX_FMT_BGR24, SWS_BICUBIC, NULL, NULL, NULL);
    sws_scale(img_convert_ctx, picture->data, picture->linesize, 0, picture->height, pFrameRGB->data, pFrameRGB->linesize);
    sws_freeContext(img_convert_ctx);
    // Save the frame to disk
    if(++frame<=5)
        SaveFrame(pFrameRGB, c->width, c->height, frame);

Answer 1

如果我改为转换为ARGB，结果很好@@。

Answer 2

也许您在意味着PIX_FMT_BGR24时意外选择了PIX_FMT_RGB24？

struct SwsContext *img_convert_ctx = sws_getContext(c->width, c->height, 
    PIX_FMT_YUV420P, c->width, c->height, PIX_FMT_RGB24, SWS_BICUBIC, 
    NULL, NULL, NULL);

ffmpeg YUV到RGB失真的颜色和位置

2 个答案: