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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.

• Video concatenation puts sound out of sync

  9 août 2019, par mmorin

  (Cross-posted from Video Production, where the question received no answers and may be more technical than usual video production.)

  I have several MOV files from a DSLR camera. I concatenate them with directions from this thread :

  ffmpeg -safe 0 -f concat -i files_to_combine -vcodec copy -acodec copy temp.MOV

  where files_to_combine is :

  file ./DSC_0013.MOV
  
  ...
  
  file ./DSC_0019.MOV

  The result has image and sound in sync for the first clip and is out of sync by fractions of a second in the second clip, and out of sync by around a second for the last clip. It is probably related to this error from the log :

  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f82dd802200] st: 0 edit list: 1 Missing key frame while searching for timestamp: 1000
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f82dd802200] st: 0 edit list 1 Cannot find an index entry before timestamp: 1000.
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f82dd802200] Auto-inserting h264_mp4toannexb bitstream filter

  How can I trim the frames to the available sound stream, then concatenate the two videos ?

  The full log from the ffmpeg command is :

  ffmpeg version 4.1.3 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.3_1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-11.0.2.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
  
    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
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f82dc00e000] Auto-inserting h264_mp4toannexb bitstream filter
  
  Input #0, concat, from 'files_to_combine':
  
    Duration: N/A, start: -0.592000, bitrate: 36888 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, smpte170m/bt709/bt470m), 1920x1080, 35352 kb/s, 50 fps, 50 tbr, 50k tbn, 100 tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, stereo, s16, 1536 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Output #0, mov, to 'temp.MOV':
  
    Metadata:
  
      encoder         : Lavf58.20.100
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, smpte170m/bt709/bt470m), 1920x1080, q=2-31, 35352 kb/s, 50 fps, 50 tbr, 50k tbn, 50k tbc
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, stereo, s16, 1536 kb/s
  
      Metadata:
  
        handler_name    : SoundHandler
  
  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 @ 0x7f82dd802200] st: 0 edit list: 1 Missing key frame while searching for timestamp: 1000
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f82dd802200] st: 0 edit list 1 Cannot find an index entry before timestamp: 1000.
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7f82dd802200] Auto-inserting h264_mp4toannexb bitstream filter
  
  frame=41886 fps=547 q=-1.0 Lsize= 3789826kB time=00:13:58.75 bitrate=37014.8kbits/s speed=10.9x    
  
  video:3631879kB audio:157123kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.021759%

  Update (1 July 2019)

  I thought that the files had a problem at the beginning or at the end, so I
  trimmed one second from each end, but it still had the sound out of sync :

  FILES=files_to_combine
  
  OUTPUT=show2.MOV
  
  rm $FILES
  
  for i in 3 4 5 6 7 8 9; do
  
      rm ${i}.MOV
  
      duration=$(ffprobe -v 0 -show_entries format=duration -of compact=p=0:nk=1  DSC_001${i}.MOV)
  
      trimmed=$(echo $duration - 1 | bc)
  
      ffmpeg -ss 1 -t $trimmed -i DSC_001${i}.MOV -vcodec copy -acodec copy ${i}.MOV
  
      echo file ./${i}.MOV >> $FILES
  
  done
  
  
  
  rm $OUTPUT
  
  ffmpeg -safe 0 -f concat -i $FILES -vcodec copy -acodec copy $OUTPUT

  When I trim a single file near the end, the sound and video do not seem out of sync :

  ffmpeg -ss 00:09:20 -t 20 -i DSC_0014.MOV -vcodec copy -acodec copy end.MOV

  When I concatenate only 30 seconds from each video, the result seems OK :

  FILES=files_to_combine
  
  OUTPUT=show2.MOV
  
  rm $FILES
  
  for i in 3 4 5 6 7 8 9; do
  
      rm ${i}.MOV
  
      duration=$(ffprobe -v 0 -show_entries format=duration -of compact=p=0:nk=1  DSC_001${i}.MOV)
  
      start=$(echo $duration - 30 | bc)
  
      end=$(echo $duration - 1 | bc)
  
      ffmpeg -ss $start -t $end -i DSC_001${i}.MOV -vcodec copy -acodec copy ${i}.MOV
  
      echo file ./${i}.MOV >> $FILES
  
  done
  
  
  
  rm $OUTPUT
  
  ffmpeg -safe 0 -f concat -i $FILES -vcodec copy -acodec copy $OUTPUT

  This last concatenation gives this error multiple times :

  [mov @ 0x7fc3c7837400] Non-monotonous DTS in output stream 0:0; previous: 9080205, current: 9080200; changing to 9080206. This may result in incorrect timestamps in the output file.

  So I am guessing that the problem is small differences in timestamps that
  accumulate and become more noticeable with longer durations and the
  concatenation of multiple files.

  For reference, the DSLR that shot these clips is a Nikon D3300 and the result
  of ffprobe on one of the files is :

  $ ffprobe DSC_0017.MOV -hide_banner
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fab70003800] st: 0 edit list: 1 Missing key frame while searching for timestamp: 1000
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fab70003800] st: 0 edit list 1 Cannot find an index entry before timestamp: 1000.
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'DSC_0017.MOV':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537331968
  
      compatible_brands: qt  niko
  
      creation_time   : 2019-06-12T23:52:37.000000Z
  
    Duration: 00:09:53.58, start: 0.000000, bitrate: 36843 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, smpte170m/bt709/bt470m), 1920x1080, 35300 kb/s, 50 fps, 50 tbr, 50k tbn, 100 tbc (default)
  
      Metadata:
  
        creation_time   : 2019-06-12T23:52:37.000000Z
  
      Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, 2 channels, s16, 1536 kb/s (default)
  
      Metadata:
  
        creation_time   : 2019-06-12T23:52:37.000000Z

  Update (9 August 2019)

  I concatenated the files in iMovie and the sound and image are not as out of sync as with FFMPEG. Maybe iMovie aligns the timestamps at the end of each clip instead of concatenating the audio and image streams separately.

  I ran the concatenation again with the latest ffmpeg 4.1.4_1 on these files and others from the same camera. The audio and image are in sync in one case (the results lasts 46 minutes) out of sync in another (the result lasts 48 minutes).

• How can fix CalledProcessError : in ffmpeg

  7 décembre 2020, par Mario

  I hope someone can help to troubleshoot this problem. I'm trying to save the loss plots out of Keras in the form of the following animation.

  



  

  



  but I have been facing the following error, and ultimately I can't save the animation :

  



  MovieWriter stderr:&#xA;[h264_v4l2m2m @ 0x55a67176f430] Could not find a valid device&#xA;[h264_v4l2m2m @ 0x55a67176f430] can&#x27;t configure encoder&#xA;Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height&#xA;&#xA;---------------------------------------------------------------------------&#xA;BrokenPipeError                           Traceback (most recent call last)&#xA;~/anaconda3/envs/CR7/lib/python3.6/site-packages/matplotlib/animation.py in saving(self, fig, outfile, dpi, *args, **kwargs)&#xA;    229         try:&#xA;--> 230             yield self&#xA;    231         finally:&#xA;&#xA;~/anaconda3/envs/CR7/lib/python3.6/site-packages/matplotlib/animation.py in save(self, filename, writer, fps, dpi, codec, bitrate, extra_args, metadata, extra_anim, savefig_kwargs, progress_callback)&#xA;   1155                             frame_number &#x2B;= 1&#xA;-> 1156                     writer.grab_frame(**savefig_kwargs)&#xA;   1157 &#xA;&#xA;~/anaconda3/envs/CR7/lib/python3.6/site-packages/matplotlib/animation.py in grab_frame(self, **savefig_kwargs)&#xA;    383         self.fig.savefig(self._frame_sink(), format=self.frame_format,&#xA;--> 384                          dpi=self.dpi, **savefig_kwargs)&#xA;    385 &#xA;&#xA;~/anaconda3/envs/CR7/lib/python3.6/site-packages/matplotlib/figure.py in savefig(self, fname, transparent, **kwargs)&#xA;   2179 &#xA;-> 2180         self.canvas.print_figure(fname, **kwargs)&#xA;   2181 &#xA;&#xA;~/anaconda3/envs/CR7/lib/python3.6/site-packages/matplotlib/backend_bases.py in print_figure(self, filename, dpi, facecolor, edgecolor, orientation, format, bbox_inches, **kwargs)&#xA;   2081                     bbox_inches_restore=_bbox_inches_restore,&#xA;-> 2082                     **kwargs)&#xA;   2083             finally:&#xA;&#xA;~/anaconda3/envs/CR7/lib/python3.6/site-packages/matplotlib/backends/backend_agg.py in print_raw(self, filename_or_obj, *args, **kwargs)&#xA;    445                 cbook.open_file_cm(filename_or_obj, "wb") as fh:&#xA;--> 446             fh.write(renderer._renderer.buffer_rgba())&#xA;    447 &#xA;&#xA;BrokenPipeError: [Errno 32] Broken pipe&#xA;&#xA;During handling of the above exception, another exception occurred:&#xA;&#xA;CalledProcessError                        Traceback (most recent call last)&#xA; in <module>&#xA;     17 print(f&#x27;{model_type.upper()} Train Time: {Timer} sec&#x27;)&#xA;     18 &#xA;---> 19 create_loss_animation(model_type, hist.history[&#x27;loss&#x27;], hist.history[&#x27;val_loss&#x27;], epoch)&#xA;     20 &#xA;     21 evaluate(model, trainX, trainY, testX, testY, scores_train, scores_test)&#xA;&#xA; in create_loss_animation(model_type, loss_hist, val_loss_hist, epoch)&#xA;     34 &#xA;     35     ani = matplotlib.animation.FuncAnimation(fig, animate, fargs=(l1, l2, loss, val_loss, title), repeat=True, interval=1000, repeat_delay=1000)&#xA;---> 36     ani.save(f&#x27;loss_animation_{model_type}_oneDataset.mp4&#x27;, writer=writer)&#xA;&#xA;~/anaconda3/envs/CR7/lib/python3.6/site-packages/matplotlib/animation.py in save(self, filename, writer, fps, dpi, codec, bitrate, extra_args, metadata, extra_anim, savefig_kwargs, progress_callback)&#xA;   1154                             progress_callback(frame_number, total_frames)&#xA;   1155                             frame_number &#x2B;= 1&#xA;-> 1156                     writer.grab_frame(**savefig_kwargs)&#xA;   1157 &#xA;   1158         # Reconnect signal for first draw if necessary&#xA;&#xA;~/anaconda3/envs/CR7/lib/python3.6/contextlib.py in __exit__(self, type, value, traceback)&#xA;     97                 value = type()&#xA;     98             try:&#xA;---> 99                 self.gen.throw(type, value, traceback)&#xA;    100             except StopIteration as exc:&#xA;    101                 # Suppress StopIteration *unless* it&#x27;s the same exception that&#xA;&#xA;~/anaconda3/envs/CR7/lib/python3.6/site-packages/matplotlib/animation.py in saving(self, fig, outfile, dpi, *args, **kwargs)&#xA;    230             yield self&#xA;    231         finally:&#xA;--> 232             self.finish()&#xA;    233 &#xA;    234 &#xA;&#xA;~/anaconda3/envs/CR7/lib/python3.6/site-packages/matplotlib/animation.py in finish(self)&#xA;    365     def finish(self):&#xA;    366         &#x27;&#x27;&#x27;Finish any processing for writing the movie.&#x27;&#x27;&#x27;&#xA;--> 367         self.cleanup()&#xA;    368 &#xA;    369     def grab_frame(self, **savefig_kwargs):&#xA;&#xA;~/anaconda3/envs/CR7/lib/python3.6/site-packages/matplotlib/animation.py in cleanup(self)&#xA;    409         if self._proc.returncode:&#xA;    410             raise subprocess.CalledProcessError(&#xA;--> 411                 self._proc.returncode, self._proc.args, out, err)&#xA;    412 &#xA;    413     @classmethod&#xA;&#xA;CalledProcessError: Command &#x27;[&#x27;/usr/bin/ffmpeg&#x27;, &#x27;-f&#x27;, &#x27;rawvideo&#x27;, &#x27;-vcodec&#x27;, &#x27;rawvideo&#x27;, &#x27;-s&#x27;, &#x27;720x720&#x27;, &#x27;-pix_fmt&#x27;, &#xA;&#x27;rgba&#x27;, &#x27;-r&#x27;, &#x27;5&#x27;, &#x27;-loglevel&#x27;, &#x27;error&#x27;, &#x27;-i&#x27;, &#x27;pipe:&#x27;, &#x27;-vcodec&#x27;, &#x27;h264&#x27;, &#x27;-pix_fmt&#x27;, &#x27;yuv420p&#x27;, &#x27;-b&#x27;, &#x27;800k&#x27;, &#x27;-y&#x27;, &#xA;&#x27;loss_animation_CNN_oneDataset.mp4&#x27;]&#x27; returned non-zero exit status 1.&#xA;</module>

  



  I tried to ignore the error by this answer but it seems it's not the case. I also checked similar case but its answer for getting a static git binary is not my cas as well since not especial converting PNG to MP4 !

  



  My code is as follows :

  



  plt.rcParams['animation.ffmpeg_path'] = '/usr/bin/ffmpeg'

def animate(i, data1, data2, line1, line2):
    temp1 = data1.iloc[:int(i+1)]
    temp2 = data2.iloc[:int(i+1)]

    line1.set_data(temp1.index, temp1.value)
    line2.set_data(temp2.index, temp2.value)

    return (line1, line2)


def create_loss_animation(model_type, data1, data2):
    fig = plt.figure()
    plt.title(f'Loss on Train & Test', fontsize=25)
    plt.xlabel('Epoch', fontsize=20)
    plt.ylabel('Loss MSE for Sx-Sy & Sxy', fontsize=20)
    plt.xlim(min(data1.index.min(), data2.index.min()), max(data1.index.max(), data2.index.max()))
    plt.ylim(min(data1.value.min(), data2.value.min()), max(data1.value.max(), data2.value.max()))

    l1, = plt.plot([], [], 'o-', label='Train Loss', color='b', markevery=[-1])
    l2, = plt.plot([], [], 'o-', label='Test Loss', color='r', markevery=[-1])
    plt.legend(loc='center right', fontsize='xx-large')

    Writer = animation.writers['ffmpeg']
    writer = Writer(fps=5, bitrate=1800)

    ani = matplotlib.animation.FuncAnimation(fig, animate, fargs=(data1, data2, l1, l2), repeat=True, interval=1000, repeat_delay=1000)
    ani.save(f'{model_type}.mp4', writer=writer)

# create datasets
x = np.linspace(0,150,50)
y1 = 41*np.exp(-x/20)
y2 = 35*np.exp(-x/50)

my_data_number_1 = pd.DataFrame({'x':x, 'value':y1}).set_index('x')
my_data_number_2 = pd.DataFrame({'x':x, 'value':y2}).set_index('x')

create_loss_animation('test', my_data_number_1, my_data_number_2)