Recherche avancée

Sur d’autres sites (6957)

• parser not found for codec wmav2

  5 décembre 2011, par HashCoder

  I am getting a warning when I run the below command.

  Warning : [asf @ 01C787A0] parser not found for codec wmav2, packets or times may be inval
  id.

  I am using the latest ffmpeg.exe, did I miss any parameters. Any suggestions please.

  ffmpeg -i Assets\Logitech_webcam_on_PC.wmv -sameq -f swf -y -an -s 640x360 MySlide.swf
  
  ffmpeg version N-35295-gb55dd10, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Nov 30 2011 00:52:52 with gcc 4.6.2
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-ru
  
  ntime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libope
  
  ncore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --en
  
  able-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger -
  
  -enable-libspeex --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwben
  
  c --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-
  
  libxvid --enable-zlib
  
    libavutil    51. 29. 1 / 51. 29. 1
  
    libavcodec   53. 39. 1 / 53. 39. 1
  
    libavformat  53. 22. 0 / 53. 22. 0
  
    libavdevice  53.  4. 0 / 53.  4. 0
  
    libavfilter   2. 50. 0 /  2. 50. 0
  
    libswscale    2.  1. 0 /  2.  1. 0
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  [asf @ 01C787A0] parser not found for codec wmav2, packets or times may be inval
  
  id.
  
  
  
  Seems stream 1 codec frame rate differs from container frame rate: 1000.00 (1000
  
  /1) -> 0.08 (1/12)
  
  Input #0, asf, from 'Assets\Logitech_webcam_on_PC.wmv':
  
    Metadata:
  
      WMFSDKVersion   : 11.0.5721.5265
  
      WMFSDKNeeded    : 0.0.0.0000
  
      IsVBR           : 1
  
      VBR Peak        : 50500.0000
  
      Buffer Average  : 66550.0000
  
    Duration: 00:00:36.22, start: 0.000000, bitrate: 497 kb/s
  
      Stream #0:0(eng): Audio: wmav2 (a[1][0][0] / 0x0161), 32000 Hz, 1 channels,
  
  s16, 20 kb/s
  
      Stream #0:1(eng): Video: wmv2 (WMV2 / 0x32564D57), yuv420p, 320x180, 422 kb/
  
  s, 0.08 tbr, 1k tbn, 1k tbc
  
  [buffer @ 02AA9760] w:320 h:180 pixfmt:yuv420p tb:1/1000000 sar:0/1 sws_param:
  
  [scale @ 02AA9A80] w:320 h:180 fmt:yuv420p -> w:640 h:360 fmt:yuv420p flags:0x4
  
  Output #0, swf, to 'MySlide.swf':
  
    Metadata:
  
      WMFSDKVersion   : 11.0.5721.5265
  
      WMFSDKNeeded    : 0.0.0.0000
  
      IsVBR           : 1
  
      VBR Peak        : 50500.0000
  
      Buffer Average  : 66550.0000
  
      encoder         : Lavf53.22.0
  
      Stream #0:0(eng): Video: flv1, yuv420p, 640x360, q=2-31, 200 kb/s, 90k tbn,
  
  0.08 tbc
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (wmv2 -> flv)
  
  Press [q] to stop, [?] for help
  
  frame=    4 fps=  0 q=0.0 size=      97kB time=00:00:48.00 bitrate=  16.6kbits/s
  
  frame=    5 fps=  0 q=0.0 Lsize=     111kB time=00:01:00.00 bitrate=  15.2kbits/
  
  s dup=0 drop=599
  
  video:111kB audio:0kB global headers:0kB muxing overhead 0.128646%

• Rawvideo to mp4 container

  21 février 2020, par Expressingx

  How can I stream rawvideo codec to mp4 container ? The error is Could not find tag for codec rawvideo in stream #0, codec not currently supported in container. Url is for example video=Logitech HD Webcam C270 and Format is dshow. Filename is lets say out.mp4

  AVFormatContext* pInputFmtCtx = avformat_alloc_context();
  
  AVInputFormat* inputFormat = av_find_input_format(Format);
  
  
  
  avformat_open_input(&pInputFmtCtx, url, inputFormat, null);
  
  if (avformat_find_stream_info(pInputFmtCtx, null) != -1)
  
     ... find stream index
  
  
  
  AVCodec* videoDecoder = avcodec_find_decoder(pInputFmtCtx->streams[_vidStreamIndex]->codecpar->codec_id);
  
  
  
  AVCodecContext* videcCodecCtx = avcodec_alloc_context3(videoDecoder);
  
  avcodec_parameters_to_context(videcCodecCtx, videoCodecParams);
  
  
  
  avcodec_open2(videcCodecCtx, videoDecoder, null);
  
  
  
  // and the output context
  
  AVFormatContext* pOutputFmtCtx = null;
  
  avformat_alloc_output_context2(&pOutputFmtCtx, null, null, fileName);
  
  
  
  // iterate over streams of input context and when we find it
  
  AVStream* in_stream = pInputFmtCtx->streams[i];
  
  AVCodecParameters* in_codecpar = in_stream->codecpar;
  
  
  
  AVStream* out_stream = avformat_new_stream(pOutputFmtCtx, null);
  
  
  
  // init h264 encoder
  
  AVCodec* videoEncoder = ffmpeg.avcodec_find_encoder(AVCodecID.AV_CODEC_ID_H264);
  
  pVideoEncoderCodecContext = ffmpeg.avcodec_alloc_context3(videoEncoder);
  
  
  
  pVideoEncoderCodecContext->time_base = videcCodecCtx->time_base;
  
  pVideoEncoderCodecContext->framerate = videcCodecCtx->framerate;
  
  pVideoEncoderCodecContext->width = videcCodecCtx->width;
  
  pVideoEncoderCodecContext->height = videcCodecCtx->height;
  
  pVideoEncoderCodecContext->bit_rate = videcCodecCtx->bit_rate;
  
  pVideoEncoderCodecContext->gop_size = videcCodecCtx->gop_size;
  
  pVideoEncoderCodecContext->pix_fmt = AVPixelFormat.AV_PIX_FMT_YUV420P;
  
  pVideoEncoderCodecContext->flags |= ffmpeg.AV_CODEC_FLAG_GLOBAL_HEADER;
  
  
  
  // copy parameters to outstream codec
  
  avcodec_parameters_copy(out_stream->codecpar, in_codecpar);
  
  
  
  ....
  
  
  
  // after that
  
  avio_open(&pOutputFmtCtx->pb, fileName, AVIO_FLAG_WRITE);
  
  avformat_write_header(pOutputFmtCtx, &opts);
  
  
  
  // and reading
  
  while (av_read_frame(pInputFormatContext, pkt) >= 0)
  
  
  
  // decode 
  
  avcodec_send_packet(videcCodecCtx, pkt);
  
  //receive the raw frame from the decoder
  
  avcodec_receive_frame(videcCodecCtx, frame);
  
  
  
  // now encode if its video packet
  
  int ret = avcodec_send_frame(pVideoEncoderCodecContext, frame);
  
  if (ret < 0)
  
  {
  
      continue;
  
  }
  
  
  
  while (ret >= 0)
  
  {
  
      ret = avcodec_receive_packet(pVideoEncoderCodecContext, packet);
  
  
  
      if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
  
      {
  
             return;
  
      }
  
  
  
      av_packet_rescale_ts(packet, pVideoEncoderCodecContext->time_base, pOutputFmtCtx->streams[packet->stream_index]->time_base);
  
      av_interleaved_write_frame(pOutputFmtCtx, pkt);
  
  
  
      av_packet_unref(packet);
  
  }

  This works fine if the camera streams H264, but if the camera streams rawvideo, it doesn’t stream to the file and throws error.

  EDIT As suggested I’m trying to encode it now, but avcodec_send_frame() returns -22 and nothing is saved to the file. Where do I miss ? Code edited.

• Opencv RTSP streaming with ffmpeg and gstreamer

  14 septembre 2015, par ironman

  I am using an ip camera which has mainstream (with resolution 1920x1080) and substream (with resolution 720x576). My aim is to detect the motion by using the substream, if motion occurs I take a snopshot from the mainstream and do some processing on this image. Here is my code’

      VideoCapture cap;   //video capture device captures the pal stream
  
      VideoCapture cap2;  //video capture device captures the main stream
  
  
  
      // cap.set(CV_CAP_PROP_BUFFERSIZE,1);
  
      // cap2.set(CV_CAP_PROP_BUFFERSIZE,1);
  
      //cap.set(CV_CAP_GSTREAMER_QUEUE_LENGTH,1);
  
      //cap2.set(CV_CAP_GSTREAMER_QUEUE_LENGTH,1);
  
      cap.open("rtsp://usr:pass@x.x.x.x:554/Streaming/Channels/2?transportmode=unicast&profile=Profile_2",CAP_FFMPEG);  //open substream
  
      cap2.open("rtsp:///usr:pass@x.x.x.x:554/Streaming/Channels/1?transportmode=unicast&profile=Profile_1",CAP_FFMPEG);  //open mainstream
  
      bool frame_read = false;
  
      int motion val;
  
  
  
      while (true) {
  
          frame_read = cap.read(rgb_im); //read the frame from substream
  
          //cap2.grab();
  
          if (!frame_read) {
  
              break;
  
          }
  
          cvtColor(rgb_im, gray_im, CV_BGR2GRAY);
  
          motion_val = detect_motion(gray_im);   //find the motion value
  
  
  
          if (motion_val > MOTION_OCCURRED)    //check if motion occurs
  
          {
  
              cap2>>frame_big;    //get one frame from the main stream
  
              process(frame_big);  //do processing
  
          }
  
          imshow("1", rgb_im);
  
              if (waitKey(1) >= 0)
  
                  break;
  
      }`

  When, I open the stream with CAP_FFMPEG flag latency is very low (under 1 sec). As seen above I regularly read the substream and if motion occurs I read the mainstream. But the frames which I read from the mainstream is not synchronous with the substream. Most probably I grab the frames which waits in the buffer. So I miss the frame with motion and I get an older frame. How can I handle this issue ? Somehow I have to make buffer size 1 frame but I cannot find any way.

  I have tried
  cap.set(CV_CAP_PROP_BUFFERSIZE,1); but since it needs DC1394 support it does not solve my problem.

  Secondly, I have tried cap2.grab() after I read the substream but it increases the latency(make latency about 3 seconds).

  Thirdly, I have tried to open videocapture objects with cv_cap_gstreamer flag cap.open("rtsp://usr:pass@x.x.x.x:554/Streaming/Channels/2transportmode=unicast&profile=Profile_2",CV_CAP_GSTREAMER); . It solves my buffering problem. In other words, when I detect the motion from the substream, I am able to capture the same instant from the mainstream. But with the gstreamer I have huge delay about 3 seconds which is not desirable for my case.(with gstreamer I tried to read several rtsp streams with different resolutions and latency remains the same) How can I solve the latency issue when I am using gstreamer with opencv ?