0

抱歉,由于声誉低,我仍然无法为我的问题发布图片。

我使用 ffmpeg 函数将解码帧从 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,框架宽度和高度为 (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);
4

2 回答 2

0

如果我更改为转换为 ARGB,结果很好@@。

于 2012-08-06T13:52:19.877 回答
0

也许你无意中选择了PIX_FMT_BGR24你的意思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);
于 2012-11-15T06:13:35.850 回答