intnumBytes;uint8_t*buffer=NULL;// Determine required buffer size and allocate buffer.numBytes=av_image_get_buffer_size(AV_PIX_FMT_RGB24,pCodecCtx->width,pCodecCtx->height,1);buffer=(uint8_t*)av_malloc(numBytes*sizeof(uint8_t)); 1. 2. 3. 4. 5. 6. av_malloc是一个 FFmpeg 的 ...
import subprocess def get_video_size(video_filename): """Returns width, height of video using ffprobe""" # Video duration and hence start time proc = subprocess.Popen(['ffprobe', video_filename], stdout=subprocess.PIPE, stderr=subprocess.STDOUT) res = proc.communicate()[0] # Check if...
从FFmpegStream获取视频大小的方法是通过使用FFmpeg命令行工具或者FFmpeg库来实现。FFmpeg是一个开源的跨平台音视频处理工具,可以用于处理、转码、编辑、流媒体等多种音视频操作。 ...
img_convert_ctx = sws_getContext(m_width, m_height, pix_fmt, pCodecCtx->width, pCodecCtx->height, PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL); } sws_scale(img_convert_ctx, (const uint8_t* const*)pframe->data, pframe->linesize, 0, pCodecCtx->height, pFrameYUV->data, ...
m_VideoHeight=m_AVCodecContext->height; m_RGBAFrame=av_frame_alloc(); //计算 Buffer 的大小 intbufferSize=av_image_get_buffer_size(AV_PIX_FMT_RGBA,m_VideoWidth,m_VideoHeight,1); //为 m_RGBAFrame 分配空间 m_FrameBuffer=(uint8_t*)av_malloc(bufferSize*sizeof(uint8_t)); ...
frame->width, frame->height,av_get_pix_fmt_name(frame->format));return-1; } video_frame_count++;staticintiFrame =0;if(frame->key_frame ==1)//如果是关键帧{sws_scale(pSWSCtx, frame->data, frame->linesize,0, video_dec_ctx->height, ...
width, height, av_get_pix_fmt_name(pix_fmt), frame->width, frame->height, av_get_pix_fmt_name(frame->format)); return -1; } video_frame_count++; static int iFrame = 0; if (frame->key_frame == 1) //如果是关键帧 { sws_scale(pSWSCtx, frame->data, frame->linesize, 0, vide...
ffmpeg -list_options true -f dshow -i video="USB 2861 Device" 这个命令行的作用是获取指定视频采集设备支持的分辨率、帧率和像素格式等属性,返回的是一个列表,结果如下: 这里我们看到采集设备支持的最大分辨率是720x576,输出像素格式是yuyv422,支持的帧率为29.97和25FPS。
m_VideoHeight = m_AVCodecContext->height; m_RGBAFrame = av_frame_alloc(); //计算 Buffer 的大小 int bufferSize = av_image_get_buffer_size(AV_PIX_FMT_RGBA, m_VideoWidth, m_VideoHeight, 1); //为 m_RGBAFrame 分配空间 m_FrameBuffer = (uint8_t *) av_malloc(bufferSize * sizeof(ui...
// 视频流索引int audioStreamIndex; // 音频流索引char videoCodecName[256];int width; // 视频宽int height; // 视频高double frameRate; // 视频帧率char audioCodecName[256];int sampleRate; // 采样率int channels; // 声道数} AVGeneralMediaInfo;void get_avgeneral_mediainfo(AVGeneralMediaInfo* ...