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• FFMpeg muxing h264 to mp4 resultant file is not running

  11 mars 2016, par M.Taha

  I am writing code to mux h264 file into mp4 by using latest FFMPEG 3.0. Muxing is working but the resultant mp4 file is not showing vedio, only the time is running when i play the resultant mp4 file. Kindly try to help to solve this. Please tell me what i am missing. Here is my code :

  int main()
  
  {   
  
      avcodec_register_all();
  
  
  
      av_register_all();
  
  
  
      // define AVOutputFormat
  
      AVOutputFormat *avoutputFormat = NULL;
  
      avoutputFormat = av_guess_format("mp4", NULL, NULL);
  
      if (!avoutputFormat) {
  
      fprintf(stderr, "Could not find suitable output format\n");
  
      return 1;
  
      }
  
  
  
      AVFormatContext *avoutFmtCtx = NULL;
  
      /*Below initialize AVFormatContext.*/
  
      avformat_alloc_output_context2(&avoutFmtCtx, avoutputFormat, NULL, NULL);
  
  
  
      avoutFmtCtx->oformat = avoutputFormat;
  
      sprintf_s(avoutFmtCtx->filename, "%s", "Out.mp4");  /*Filling output file name..*/
  
  
  
      if (avoutputFormat->video_codec == AV_CODEC_ID_NONE) 
  
      printf("\n Unsupported format...");
  
  
  
      AVStream * avoutStrm = avformat_new_stream(avoutFmtCtx, 0);
  
  
  
      if (!avoutStrm) {
  
      _tcprintf(_T("FFMPEG: Could not alloc video stream\n"));        
  
      }
  
  
  
      AVCodecContext *c = avoutStrm->codec;
  
      c->codec_id     = avoutputFormat->video_codec;
  
      c->codec_type   = AVMEDIA_TYPE_VIDEO;
  
      c->bit_rate     = 2000*1000;
  
      c->width        = 1920; 
  
      c->height       = 1080; 
  
      AVRational avr;
  
      avr.den = 30;
  
      avr.num = 1;
  
  
  
      avoutStrm->time_base = c->time_base = av_add_q(avoutStrm->codec->time_base, avr);
  
  
  
      // Some formats want stream headers to be separate
  
      if(avoutFmtCtx->oformat->flags & AVFMT_GLOBALHEADER)
  
      c->flags |= CODEC_FLAG_GLOBAL_HEADER;
  
  
  
      // Open the output container file
  
      if (avio_open(&avoutFmtCtx->pb, avoutFmtCtx->filename, AVIO_FLAG_WRITE) < 0)
  
      {
  
      _tcprintf(_T("FFMPEG: Could not open '%s'\n"), avoutFmtCtx->filename);      
  
      }
  
  
  
      m_pExtDataBuffer = (uint8_t*)av_malloc(1000 + 1000);
  
      if(!m_pExtDataBuffer) {
  
      _tcprintf(_T("FFMPEG: could not allocate required buffer\n"));
  
  
  
      }
  
  
  
      uint8_t SPSbuf[1000];
  
      uint8_t PPSbuf[1000];
  
      memcpy(m_pExtDataBuffer, SPSbuf, 1000);             
  
      memcpy(m_pExtDataBuffer + 1000, PPSbuf, 1000);  
  
  
  
      /* Codec "extradata" conveys the H.264 stream SPS and PPS info (MPEG2: sequence header is housed in SPS buffer, PPS buffer is empty)*/
  
      c->extradata        = m_pExtDataBuffer;
  
      c->extradata_size   = 1000 + 1000;
  
  
  
      if(avformat_write_header(avoutFmtCtx,NULL)) {
  
      _tcprintf(_T("FFMPEG: avformat_write_header error!\n"));
  
  
  
      }
  
  
  
      /* Here do writing data in loop...*/
  
      int m_nProcessedFramesNum = 0;
  
  
  
      while(1)
  
      {
  
      ++m_nProcessedFramesNum;
  
      AVPacket pkt;
  
      av_init_packet(&pkt);
  
  
  
      AVCodecContext *c = avoutStrm->codec;
  
      avoutStrm->pts.val = m_nProcessedFramesNum;
  
      pkt.stream_index    = avoutStrm->index;
  
  
  
      pkt.data            = /*Filling h.264 data from here... This is valid h264 data*/
  
      pkt.size            = /*Filling valid h264 data size here...*/
  
      av_new_packet(&pkt,pkt.size);
  
      pkt.pts = m_nProcessedFramesNum*512;
  
      pkt.dts = m_nProcessedFramesNum*512;
  
      pkt.duration = 512;
  
  
  
      // Write the compressed frame in the media file
  
      if (av_interleaved_write_frame(avoutFmtCtx, &pkt)) {
  
      _tcprintf(_T("FFMPEG: Error while writing video frame\n"));         
  
      }/*End of loop.*/
  
  
  
      av_free_packet(&pkt);       
  
  
  
      }   
  
      av_write_trailer(avoutFmtCtx);
  
      avio_close(avoutFmtCtx->pb);
  
      avformat_free_context(avoutFmtCtx);
  
  }

• GIF file running only once in MP4 output file using FFMPEG

  5 février 2023, par asdasd asdasd

  I have a gif file with accompanying mp3 music.

  


  My goal is to run the gif file with the mp3 music file and out-put it as an MP4 file. This works, HOWEVER

  


  Once the file is outputted, I have some issues

  


  Firstly, the gif runs only once and freezes after that, the music runs until the file ends.

  


  Here is the fmpegg command I am using

  


   subprocess.run(
        ["ffmpeg", "-i", gif_file, "-i", chosen_mp3, "-pix_fmt", "yuv420p", "-t", "10", "-loop", "0", output_file],
        check=True,shell=True
    )


  


  How can I make it so that the gif does not freeze up after running once, i.e loops until end of file or loops for an N amount of times ?

  


  In the code above, I tried to make it loop for 10 seconds but still the same issue is happening.

  


• C# Batch File Not Running Correctly

  19 juin 2013, par Scott Stevens

  i am trying to run an ffmpeg command using c# and CMD.

  I am creating and then executing a .bat file to do this. The .bat seems to create correctly, but when executed within c# it does not run correctly - It cannot find the image names. However when i exit the debugger and run the .bat the debugger created manually it works fine.

  The images have just been created by the debugger, could this have something to do with it ?

   string command1=  "ffmpeg -r 1/5 -i " + projectPrefix + "image-%%02d.bmp -i music.mp3 -qscale:v 2 -shortest -codec:a copy " + projectPrefix + "output.flv \n ffmpeg -i "+projectPrefix+"output.flv -vcodec wmv1 -acodec adpcm_ima_wav " + projectPrefix + ".wmv";
  
  
  
        // Write the string to a file.
  
       System.IO.StreamWriter file = new System.IO.StreamWriter(@"C:\Users\Scott\desktop\"+projectPrefix+".bat");
  
       file.WriteLine(command1);
  
  
  
       file.Close();
  
       Thread.Sleep(10000);
  
  
  
       System.Diagnostics.ProcessStartInfo psi = new System.Diagnostics.ProcessStartInfo(@"C:\Users\Scott\desktop\" + projectPrefix + ".bat");
  
       psi.RedirectStandardOutput = true;
  
       psi.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
  
       psi.UseShellExecute = false;
  
       System.Diagnostics.Process listFiles;
  
       listFiles = System.Diagnostics.Process.Start(psi);
  
       System.IO.StreamReader myOutput = listFiles.StandardOutput;
  
       listFiles.WaitForExit(2000);
  
       if (listFiles.HasExited)
  
       {
  
           string output = myOutput.ReadToEnd();
  
  
  
       }

  Thanks