sws_freeContext(img_convert_ctx); saveFrame(rgbBuf, currentFrameNum_/(frameNum_/pictureNum), width, height);//生成图片 } delete [] rgbBuf; //=== 把yuv420转成rgb24的代码: const int Table_fv1[256]={ -180, -179, -177, -176, -174, -173, -172, -170, -169, -167, -166, -1...
// 转换图像格式,将解压出来的YUV420P的图像转换为YUVJ420P的图像 sws_scale(sws_ctx, pFrame.data(), pFrame.linesize(), 0, pCodecCtx.height(), pFrameRGB.data(), pFrameRGB.linesize()); } if (frameFinished[0] != 0 && !pFrame.isNull()) { // Convert the image from its native for...
sws_freeContext(img_convert_ctx); saveFrame(rgbBuf, currentFrameNum_/(frameNum_/pictureNum), width, height);//生成图片 } delete[] rgbBuf; //=== 下面给出自己在网上找到的把yuv420转成rgb24的代码: constintTable_fv1[256]={ -180, -179, -177, -176, -174, -173, -172, -170, -169,...
img_convert_ctx = sws_getContext(width, height, PIX_FMT_YUV420P, width, height, PIX_FMT_RGB24, SWS_FAST_BILINEAR, 0, 0, 0); if(img_convert_ctx != 0) { sws_scale(img_convert_ctx, pict->data, pict->linesize, 0, height, (uint8_t**)&rgbBuf, linesize); sws_freeContext(img_...
//printf("Flush Decoder: Succeed to decode 1 frame!\n"); } sws_freeContext(img_convert_ctx); fclose(fp_yuv); av_frame_free(&pFrameYUV); av_frame_free(&pFrame); avcodec_close(pCodecCtx); avformat_close_input(&pFormatCtx);
FFMPEG中的swscale提供了视频原始数据(YUV420,YUV422,YUV444,RGB24…)之间的转换,分辨率变换等操作,使用起来十分方便,在这里记录一下它的用法。 swscale主要用于在2个AVFrame之间进行转换。 下面来看一个视频解码的简单例子,这个程序完成了对”北京移动开发者大会茶歇视频2.flv”(其实就是优酷上的一个普通视频)的解...
将视频文件中的视频流提取出来,然后将视频流中的数据包解析成原始的YUV数据。 int main(int argc, char **argv) { int ret; const char *filename, *outfilename; AVFormatContext *fmt_ctx= NULL; const AVCodec *codec; AVCodecContext *codec_ctx= NULL; ...
if(need_size!=yuv_size) { printf("wedetectyuvsize:%d,butyougive:%d,checkagain.\n",need_size,yuv_size); return0; } ret=tjCompressFromYUV(handle,yuv_buffer,width,padding,height,subsample,jpeg_buffer,jpeg_size,quality,flags); if(ret<0) { printf("compresstojpegfailed:%s\n",tjGetError...
之前的demo里面我们判断了视频格式不为AV_PIX_FMT_YUV420P则直接报错,这里我们仿照音频转换的例子,判断原始视频格式不为AV_PIX_FMT_YUV420P则使用sws_scale进行格式转换: bool VideoStreamDecoder::Init(MediaReader*reader,intstreamIndex,AVPixelFormat pixelFormat){...bool result=StreamDecoder::Init(reader,streamIn...
Setup FFMPEG 4.2.1-23 DS1517+ avoton (x64) DSM 6.2.2 Expected behavior ffmpeg should create an image from video.mp4 at frame-count 100 Actual behavior On version 4.2.1-23 the script creates an empty file, and returns Error while opening ...