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• Having trouble compiling ffmpeg code in command terminal

  10 septembre 2019, par m00ncake

  I am having a bit of trouble compiling my c++ code in my terminal. I have ffmpeg installed as shown below.

  ffmpeg version n4.1 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
  
    configuration: --enable-gpl --enable-version3 --disable-static --enable-shared --enable-small --enable-avisynth --enable-chromaprint --enable-frei0r --enable-gmp --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-librtmp --enable-libshine --enable-libsmbclient --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtesseract --enable-libtheora --enable-libtwolame --enable-libv4l2 --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libxml2 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-libmysofa --enable-openal --enable-opencl --enable-opengl --enable-libdrm
  
    libavutil      56. 22.100 / 56. 22.100
  
    libavcodec     58. 35.100 / 58. 35.100
  
    libavformat    58. 20.100 / 58. 20.100
  
    libavdevice    58.  5.100 / 58.  5.100
  
    libavfilter     7. 40.101 /  7. 40.101
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  Hyper fast Audio and Video encoder
  
  usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

  However, when I compile my c++ code, currently trying to get NTP timestamps from private data in ffmpeg but I need to include their headers ? I have looked into ffmpeg’s libavformat folder and it does have rtpdec.h but when I compile it in the command line, i get this error. (trying to include this header for RTSPState and RTSPStream as well as RTPDemuxContext)

  cf.cpp:11:10: fatal error: libavformat/rtsp.h: No such file or directory
  
   #include <libavformat></libavformat>rtpdec.h>
  
            ^~~~~~~~~~~~~~~~~~~~
  
  compilation terminated.

  This is my code :

  #include 
  
  #include 
  
  #include <iostream>
  
  #include <fstream>
  
  #include <sstream>
  
  
  
  extern "C" {
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libavformat></libavformat>avio.h>
  
  #include <libavformat></libavformat>rtpdec.h>
  
  #include <libswscale></libswscale>swscale.h>
  
  }
  
  
  
  int main(int argc, char** argv) {
  
  
  
      // Open the initial context variables that are needed
  
      SwsContext *img_convert_ctx;
  
      AVFormatContext* format_ctx = avformat_alloc_context();
  
      AVCodecContext* codec_ctx = NULL;
  
      int video_stream_index;
  
      uint32_t* last_rtcp_ts;
  
      double* base_time;
  
      double* time;
  
  
  
      // Register everything
  
      av_register_all();
  
      avformat_network_init();
  
  
  
      //open RTSP
  
      if (avformat_open_input(&amp;format_ctx, "rtsp://admin:password@192.168.1.67:554",
  
              NULL, NULL) != 0) {
  
          return EXIT_FAILURE;
  
      }
  
  
  
      if (avformat_find_stream_info(format_ctx, NULL) &lt; 0) {
  
          return EXIT_FAILURE;
  
      }
  
  
  
      //search video stream
  
      for (int i = 0; i &lt; format_ctx->nb_streams; i++) {
  
          if (format_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
  
              video_stream_index = i;
  
      }
  
  
  
      AVPacket packet;
  
      av_init_packet(&amp;packet);
  
  
  
      //open output file
  
      AVFormatContext* output_ctx = avformat_alloc_context();
  
  
  
      AVStream* stream = NULL;
  
      int cnt = 0;
  
  
  
      //start reading packets from stream and write them to file
  
      av_read_play(format_ctx);    //play RTSP
  
  
  
      // Get the codec
  
      AVCodec *codec = NULL;
  
      codec = avcodec_find_decoder(AV_CODEC_ID_H264);
  
      if (!codec) {
  
          exit(1);
  
      }
  
  
  
  // Add this to allocate the context by codec
  
  codec_ctx = avcodec_alloc_context3(codec);
  
  
  
  avcodec_get_context_defaults3(codec_ctx, codec);
  
  avcodec_copy_context(codec_ctx, format_ctx->streams[video_stream_index]->codec);
  
  std::ofstream output_file;
  
  
  
  if (avcodec_open2(codec_ctx, codec, NULL) &lt; 0)
  
      exit(1);
  
  
  
      img_convert_ctx = sws_getContext(codec_ctx->width, codec_ctx->height,
  
              codec_ctx->pix_fmt, codec_ctx->width, codec_ctx->height, AV_PIX_FMT_RGB24,
  
              SWS_BICUBIC, NULL, NULL, NULL);
  
  
  
      int size = avpicture_get_size(AV_PIX_FMT_YUV420P, codec_ctx->width,
  
              codec_ctx->height);
  
      uint8_t* picture_buffer = (uint8_t*) (av_malloc(size));
  
      AVFrame* picture = av_frame_alloc();
  
      AVFrame* picture_rgb = av_frame_alloc();
  
      int size2 = avpicture_get_size(AV_PIX_FMT_RGB24, codec_ctx->width,
  
              codec_ctx->height);
  
      uint8_t* picture_buffer_2 = (uint8_t*) (av_malloc(size2));
  
      avpicture_fill((AVPicture *) picture, picture_buffer, AV_PIX_FMT_YUV420P,
  
              codec_ctx->width, codec_ctx->height);
  
      avpicture_fill((AVPicture *) picture_rgb, picture_buffer_2, AV_PIX_FMT_RGB24,
  
              codec_ctx->width, codec_ctx->height);
  
  
  
      while (av_read_frame(format_ctx, &amp;packet) >= 0 &amp;&amp; cnt &lt; 1000) { //read ~ 1000 frames
  
  
  
          RTSPState* rt = format_ctx->priv_data;
  
          RTSPStream *rtsp_stream = rt->rtsp_streams[0];
  
          RTPDemuxContext* rtp_demux_context = rtsp_stream->transport_priv;
  
          uint32_t new_rtcp_ts = rtp_demux_context->last_rtcp_timestamp;
  
          uint64_t last_ntp_time = 0;
  
  
  
          if (new_rtcp_ts != *last_rtcp_ts) {
  
              *last_rtcp_ts = new_rtcp_ts;
  
              last_ntp_time = rtp_demux_context->last_rtcp_ntp_time;
  
              uint32_t seconds = ((last_ntp_time >> 32) &amp; 0xffffffff) - 2208988800;
  
              uint32_t fraction  = (last_ntp_time &amp; 0xffffffff);
  
              double useconds = ((double) fraction / 0xffffffff);
  
              *base_time = seconds + useconds;
  
              uint32_t d_ts = rtp_demux_context->timestamp - *last_rtcp_ts;
  
              *time = *base_time + d_ts / 90000.0;
  
              std::cout &lt;&lt; "Time is: " &lt;&lt; *time &lt;&lt; std::endl;
  
          }
  
  
  
          std::cout &lt;&lt; "1 Frame: " &lt;&lt; cnt &lt;&lt; std::endl;
  
          if (packet.stream_index == video_stream_index) {    //packet is video
  
              std::cout &lt;&lt; "2 Is Video" &lt;&lt; std::endl;
  
              if (stream == NULL) {    //create stream in file
  
                  std::cout &lt;&lt; "3 create stream" &lt;&lt; std::endl;
  
                  stream = avformat_new_stream(output_ctx,
  
                          format_ctx->streams[video_stream_index]->codec->codec);
  
                  avcodec_copy_context(stream->codec,
  
                          format_ctx->streams[video_stream_index]->codec);
  
                  stream->sample_aspect_ratio =
  
                          format_ctx->streams[video_stream_index]->codec->sample_aspect_ratio;
  
              }
  
              int check = 0;
  
              packet.stream_index = stream->id;
  
              std::cout &lt;&lt; "4 decoding" &lt;&lt; std::endl;
  
              int result = avcodec_decode_video2(codec_ctx, picture, &amp;check, &amp;packet);
  
              std::cout &lt;&lt; "Bytes decoded " &lt;&lt; result &lt;&lt; " check " &lt;&lt; check
  
                      &lt;&lt; std::endl;
  
              if (cnt > 100)    //cnt &lt; 0)
  
                      {
  
                  sws_scale(img_convert_ctx, picture->data, picture->linesize, 0,
  
                          codec_ctx->height, picture_rgb->data, picture_rgb->linesize);
  
                  std::stringstream file_name;
  
                  file_name &lt;&lt; "test" &lt;&lt; cnt &lt;&lt; ".ppm";
  
                  output_file.open(file_name.str().c_str());
  
                  output_file &lt;&lt; "P3 " &lt;&lt; codec_ctx->width &lt;&lt; " " &lt;&lt; codec_ctx->height
  
                          &lt;&lt; " 255\n";
  
                  for (int y = 0; y &lt; codec_ctx->height; y++) {
  
                      for (int x = 0; x &lt; codec_ctx->width * 3; x++)
  
                          output_file
  
                                  &lt;&lt; (int) (picture_rgb->data[0]
  
                                          + y * picture_rgb->linesize[0])[x] &lt;&lt; " ";
  
                  }
  
                  output_file.close();
  
              }
  
              cnt++;
  
          }
  
          av_free_packet(&amp;packet);
  
          av_init_packet(&amp;packet);
  
      }
  
      av_free(picture);
  
      av_free(picture_rgb);
  
      av_free(picture_buffer);
  
      av_free(picture_buffer_2);
  
  
  
      av_read_pause(format_ctx);
  
      avio_close(output_ctx->pb);
  
      avformat_free_context(output_ctx);
  
  
  
      return (EXIT_SUCCESS);
  
  }
  
  </sstream></fstream></iostream>

  The command i use to compile my code : g++ -w cf.cpp -o cf $(pkg-config --cflags --libs libavformat libswscale libavcodec)

  I am a bit new to coding in FFmpeg.

• OpenCV encoding to H264

  29 mars 2018, par Yost777

  I want to encode images to H264 video in OpenCV.

  As part of my software for image tracking, I’m using VideoWriter in OpenCV 3.4 (64-bit) with Visual Studio 2017 C++. I use ffmpeg for manual encoding, and as it comes with OpenCV I assume this is the best option. My version of OpenCV indicates it has been compiled with ffmpeg, and I can verify it loads the opencv_ffmpeg340_64.dll.

  Decoding H264 (AVC1) is absolutely fine, including when specifically using the ffmpeg API. But encoding anything other than MJPG or raw images doesn’t work :
  VideoWriter.Open() mostly returns false, for some cases it only writes an empty or small header but won’t write frames. I’ve tried not only the ffmpeg API, but also any available API. Redirecting console/debug output to intermediate window in VC doesn’t give any messages from OpenCV or ffmpeg.

  There are numerous posts on previous versions of OpenCV using FFmpeg, including (Cisco) OpenH264 library and difficulties using this. I’ve tried many options, installing codecs pack including H264, ffmpeg static version, Cisco openH264 library, setting paths etc and even tried the low level ffmpeg library functions such as cvCreateVideoWriter exposed in OpenCV, and using different video containers (AVI, MPG, MP4) as well as fourcc strings.

  I can’t believe in 2018 the great OpenCV with FFmpeg support is unable to encode anything but arcane MJPG or raw images. If it uses FFmpeg surely a significant set of functionality should be available ?

  Though I think this should work, my next best option would be using a separate ffmpeg library, which would ironically add another ffmpeg.dll to my solution I imagine. Any suggestion appreciated !

  Code fragment (using any video encoding API) :

  VideoWriter writer;
  
  int codec = VideoWriter::fourcc('X', '2', '6', '4');
  
  writer.open("test.avi", codec, 30, colorImage.size(), true);
  
  writer.write(colorImage);
  
  writer.release();

• Non-monotonous DTS in output stream when concat videos using ffmpeg

  8 février 2018, par no name

  I have three videos which I want to concat together the problem it works fine for some videos but when I test a specific video it gives me an error and cause the resulting video to show in a strange way and everything is moving very fast in the video like I was forward up the video
  this the code I used to add the video together from a file this the out.txt

  file 'D:/Build/start.mp4'
  
  file 'D:/Build/a.mp4'
  
  file 'D:/Build/Song & Lyrics/2f.mp4'

  the command i used with ffmpeg

  ffmpeg -f concat -safe 0 -i out.txt -c copy -y go.mp4

  i faced this error

      [mov,mp4,m4a,3gp,3g2,mj2 @ 05c0dbc0] Auto-inserting h264_mp4toannexb bitstream filter
  
  Input #0, concat, from 'out.txt':
  
    Duration: N/A, start: 0.000000, bitrate: 280 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720 [SAR 1:1 DAR 16:9], 155 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
  
      Metadata:
  
        creation_time   : 2018-02-08T13:25:49.000000Z
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 02/08/2018.
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s
  
      Metadata:
  
        creation_time   : 2018-02-08T13:25:49.000000Z
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 02/08/2018.
  
  Output #0, mp4, to 'go.mp4':
  
    Metadata:
  
      encoder         : Lavf58.7.100
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 155 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 90k tbc
  
      Metadata:
  
        creation_time   : 2018-02-08T13:25:49.000000Z
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 02/08/2018.
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s
  
      Metadata:
  
        creation_time   : 2018-02-08T13:25:49.000000Z
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 02/08/2018.
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 05c38840] Auto-inserting h264_mp4toannexb bitstream filter
  
  [mp4 @ 061b8f00] Non-monotonous DTS in output stream 0:0; previous: 624624, current: 88735; changing to 624625. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 061b8f00] Non-monotonous DTS in output stream 0:0; previous: 624625, current: 89247; changing to 624626. This may result in incorrect timestamps in the output file.
  
  [mp4 @ 061b8f00] Non-monotonous DTS in output stream 0:0; previous: 624626, current: 89759; changing to 624627. This may result in incorrect timestamps in the output file.
  
  .....
  
  
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 05c38840] Auto-inserting h264_mp4toannexb   bitstream filtereed=69.7x
  
  frame= 8991 fps=2903 q=-1.0 Lsize=    8378kB time=00:05:58.22 bitrate= 191.6kbits/s speed= 116x
  
  video:2469kB audio:5625kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 3.500685%

  so what the problem make this error. the problem appear when i use this new start.mp4 to be merge with my videos i tried on other ones and it worked fine.
  Update
  i tested to convert the videos to MTS formate then concate them as an answer to similar problem but the problem is when i convert the mp4 videos to this formate the size of the file be too large from 6 MB to 42 MB !! so if there is a better answer. or a way to make the file still same size or less
  the linke of the answer is here but it worked fine
  Thanks in advance