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• video web server vb.net

  3 octobre 2014, par user2871030

  I am making an application that creates a web server with playback video, the application searches a particular folder, the fact is that achieving send videos in mp4 format, the problem I have is when the video is in another format, such as mkv I have tried to convert it to mp4 first and then read it, but that takes a lot, what I would like to do is start sending the file while it becomes, but in mp4 format this does not work, I’m using ffmpeg to convert, to convert format webm, the player reads them, but the problem is that the conversion is very slow.

• avcodec on C, frozen image

  11 décembre 2017, par gogoer

  I write video packets from video stream to buffer. and then i’m trying to write them to file.

              av_init_packet( &pkt );
  
              int bufer_size=250;
  
  
  
              while ( av_read_frame( ifcx, &pkt ) >= 0 && start_flag==0 && stop_flag==0){
  
                  printf("reading packet - %i \n", pkg_index);
  
                  if ( pkt.stream_index == i_index ) {
  
                      pkt.stream_index = ost->id;
  
                      pkt.pts = av_rescale_q_rnd(pkt.pts, ist->time_base, ost->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
  
                      pkt.dts = av_rescale_q_rnd(pkt.dts, ist->time_base, ost->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
  
                      pkt.duration = av_rescale_q(pkt.duration, ist->time_base, ost->time_base);
  
                      pkt.pos = -1;
  
                      av_copy_packet(&pkt_arr[pkg_index],&pkt);
  
                  }
  
                  av_free_packet( &pkt );
  
                  av_init_packet( &pkt );
  
                  pkg_index++;
  
  
  
                  if(pkg_index>=bufer_size){
  
  
  
                      int ret = avformat_write_header(ofcx, NULL);
  
                      av_dump_format( ofcx, 0, ofcx->filename, 1 );
  
  
  
                          int i;
  
                          int start_frame=0;
  
                          for(i=start_frame; ipb );
  
                            printf("END \n");
  
                            return 0;
  
  
  
                  }
  
              }

  now the problem : if start_frame=0 everithing is ok, i have 10 sec video file. But if start_frame=125 (for example) in resault i have video file with 5 sec frozen picture and 5 sec video.

  what is wrong ?

  also at the end i have errors :

  [avi @ 0x287a9f0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6 >= 1
  
  [avi @ 0x287a9f0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6 >= 2
  
  [avi @ 0x287a9f0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6 >= 3
  
  [avi @ 0x287a9f0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6 >= 4
  
  [avi @ 0x287a9f0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6 >= 5
  
  [avi @ 0x287a9f0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 6 >= 6

  maybe you know what is it.

• ffmpeg won't start until java exits

  9 août 2014, par user3925332

  I am trying to make a java program that automatically converts wtv files in an input folder to mpg files in output folder. The twist is that I make it run periodically, so it acts as a synchronizer.

  The following code works for converting the .wtv to a .dvr-ms, which is required by ffmpeg since it cannot convert .wtv files directly.

      Process p = Runtime.getRuntime().exec("C:\\Windows\\ehome\\WTVConverter C:\\Users\\Andrew\\Desktop\\test\\input\\input.wtv C:\\Users\\Andrew\\Desktop\\test\\output\\input.dvr-ms");
  
      p.waitFor();

  WTVConverter has no problems running from a java application. ffmpeg is a different story. Once the above line runs, I then run this...

      Process p = Runtime.getRuntime().exec("ffmpeg\\bin\\ffmpeg -y -i \"C:\\Users\\Andrew\\Desktop\\test\\output\\input.dvr-ms'" -vcodec copy -acodec copy -f dvd \"C:\Users\Andrew\Desktop\test\output\input.mpg\"");
  
      p.waitFor();

  Suddenly, there is a problem... The application ffmpeg shows up in the task manager, but it’s cpu usage is 0, and no mpeg files is being generated. If I force the java application to close, though, suddenly it starts working ! Huh ?

  What reason would there be for a command line application to wait for its calling application to quit before it executes ? I’m not incredibly command line savvy, so I don’t really know how to diagnose this problem.