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• ffmpeg dash Segment offset

  18 mars 2019, par inkubux

  I’m trying to integrate live-transcoding like "plex" or "emby" with my application.

  I am able to serve dash content over to shaka-player or dash.js but only in ’live-mode’. But I want to enable seeking through the player.

  I looked at plex and to enable this they create their own mpd file with duration so the player will have a full seekbar.

  However when seeking the player will ask for a segment number eg : 449. I need to stop ffmpeg and restart with an offset (-ss &lt;<segment>>)</segment>, but ffmpeg will just restart a transcode session from segment 0 with an initial segment.

  What I want is to tell ffmpeg to start at a seekpoint but only output from segment number and now-on.

  When playing with hls and mpegts, I can tell ffmpeg to output at a certain segment : with the option -segment_start_number but this is not available for dash. And plex use their own transcoder based of ffmpeg with the option -skip_to_segment

  I tried to ’hack’ around by keeping a manual offset on my web-server, even if I serve the "supposed" right segment after the seek point dash.js and shaka-player can’t recover the stream.. VLC on the other habd is able to (probably more tolerent) to errors in segments.

  Is the supposed right segment after a seek in dash (contains the initial segment) or only the segment.

  Is ffmpeg able to start segmenting dash as a supposed segment (for seek and resume)

  The same technique works in hls with forced key frames and a custom m3u8 (with all the "predicted" segments) but calculating the right segment length and the right bandwidth is much harder and hackish and dash is more tolerant to variation.

  I would really like to be able to seek through my live transcoding video.

  For reference here is a custom mpd file I serve to enable "seeking" :

  <mpd xmlns="urn:mpeg:dash:schema:mpd:2011" profiles="urn:mpeg:dash:profile:isoff-live:2011" type="static" suggestedpresentationdelay="PT1S" mediapresentationduration="PT49M2.920S" maxsegmentduration="PT2S" minbuffertime="PT10S">
  
      <period start="PT0S" duration="PT49M2.920S">
  
          <adaptationset segmentalignment="true">
  
              <segmenttemplate timescale="1" duration="1" initialization="$RepresentationID$/initial.mp4" media="$RepresentationID$/$Number$.m4s" startnumber="1">
  
              </segmenttemplate>
  
              <representation mimetype="video/mp4" codecs="avc1.640029" bandwidth="3766000" width="1920" height="1080">
  
              </representation>
  
          </adaptationset>
  
          <adaptationset segmentalignment="true">
  
              <segmenttemplate timescale="1" duration="1" initialization="$RepresentationID$/initial.mp4" media="$RepresentationID$/$Number$.m4s" startnumber="1">
  
              </segmenttemplate>
  
              <representation mimetype="audio/mp4" codecs="mp4a.40.2" bandwidth="188000" audiosamplingrate="48000">
  
                  <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="6"></audiochannelconfiguration>
  
              </representation>
  
          </adaptationset>
  
      </period>
  
  </mpd>

  And here is the ffmpeg command to pull it off :

  ffmpeg -ss 0 -i movie.mkv -y -acodec aac -vcodec libx264 -f dash -min_seg_duration 1000000 -individual_header_trailer 0 -pix_fmt yuv420p -vf scale=trunc(min(max(iw\,ih*dar)\,1920)/2)*2:trunc(ow/dar/2)*2 -bsf:v h264_mp4toannexb -profile:v high -level 4.1 -map_chapters -1 -map_metadata -1 -preset veryfast -movflags frag_keyframe+empty_moov -use_template 1 -use_timeline 0 -remove_at_exit 1 -crf 23 -bufsize 7532k -maxrate 3766k -start_at_zero -threads 0 -force_key_frames expr:if(isnan(prev_forced_t),eq(t,t),gte(t,prev_forced_t+1)) -init_seg_name $RepresentationID$/0_initial.mp4 -media_seg_name $RepresentationID$/0_$Number$.m4s /transcoding_temp/Z1GVWEc/index.mpd

  The media_seg_name is where I prepend the custom seek_point let’s say I want to seek to segment 1233 the template would be :

  -media_seg_name $RepresentationID$/1233_$Number$.m4s

  and the segments would be 1233_1 1233_2 1233_* So I can serve the right segment after seek. but the player does not recover and still downloading subsequent segments. I guess since a new initial segment is generated and I somehow miss headers for continuous playback after seek but I’m probably wrong.

  Thanks for your help

• swf action script convert into flv

  6 juillet 2013, par Kazim King

  this is a action script : symmetrydigital-labs.com/junior/kazim/portal/flv/Shahid_Kapoor_07.swf

  image is call outside from server.
  i want to convert this .swf file into .flv and generate thumbnail.

  Problem :
  1 : .swf file converts only video not with image (call from outsource) .swf
  2 : code was not run in server run only in localhost.

  and i am try to using this command

  $ffmpeg = 'C:\FFmpeg\ffmpeg-20130614-git-6fe419b-win32-static\bin\ffmpeg';    
  
  $ffmpeg = '/usr/bin/ffmpeg';   
  
  $cmd = "$ffmpeg -i Shahid_Kapoor_07.swf Shahid_Kapoor_07.flv";   
  
  $image = "$ffmpeg -i Shahid_Kapoor_07.swf -an -ss 00:00:03 -an -r 1 -vframes 1 -y  abc.jpg";
  
  shell_exec($cmd);
  
  shell_exec($image);

• ffmpeg trim video works on emulator but fails on arm (real device)

  21 octobre 2017, par fthopkins

  I’m trimming the videos with ffmpeg that is bigger than 10 seconds. On my JNI edit function i use commands to trim video. I try to debug but as you all know debugging on JNI function is not like native android JAVA function. Maybe it is.. but not for my knowledge. Also i used coffecatch library to catch exception but didn’t succeeded. I did go for error step by step and reached the this line of ffmpeg main function.

  EDIT

  current_time = ti = getutime(); // edited : lastly can print message on here.
  
  if (transcode() < 0) // transcode() < 0 => true and run exit_program(1).
  
      exit_program(1);
  
  ti = getutime() - ti;

  On emulator everything is working good and fast. But on real device it gives some kind of error but i couldn’t catch it. When i check the Android Monitor of Android Studio my JNI edit function’s logs appear but disappear in a second. It is weird. Also when i check the output path on device, ffmpeg gives an trimmed video output (but very slow). So it is working on background and gives a trimmed video. It is very weird too because app crashes while main method is working. I need help to figure it out. I stucked.

  My video edit JNI function

  JNIEXPORT jint JNICALL 
  
  Java_com_farukest_app_library_AppVideoEditer_natives_VideoEditer_edit
  
  (JNIEnv *env,jclass someclass, jstring inputFile, jstring outFile, jint 
  
  startTime,jint endTime, jstring fileSize, jboolean mustCompress) {
  
  
  
      log_message("Starting to cut");
  
  
  
      int numberOfArgs = 19;
  
  
  
      char** $commands = calloc(numberOfArgs, sizeof(char*));
  
      char start[5], end[5];
  
      const char *in, *out, *fileSz;
  
      itoa(startTime, start);
  
      itoa(endTime, end);
  
  
  
      in = (*env)->GetStringUTFChars(env, inputFile, 0);
  
      out = (*env)->GetStringUTFChars(env, outFile, 0);
  
      fileSz = (*env)->GetStringUTFChars(env, fileSize, 0);
  
  
  
  
  
      $commands[0] = "ffmpeg";
  
      $commands[1] = "-ss";
  
      $commands[2] = start;
  
      $commands[3] = "-y";
  
      $commands[4] = "-i";
  
      $commands[5] = in;
  
      $commands[6] = "-t";
  
      $commands[7] = end;
  
      $commands[8] =  "-vcodec";
  
      $commands[9] =  "mpeg4";
  
      $commands[10] =  "-b:v";
  
  
  
      if(mustCompress){
  
        $commands[11] =  "3072000"; // 3mb
  
      }else{
  
        $commands[11] =  fileSz;
  
      }
  
      $commands[12] =  "-b:a";
  
      $commands[13] =  "48000";
  
      $commands[14] =  "-ac";
  
      $commands[15] =  "2";
  
      $commands[16] =  "-ar";
  
      $commands[17] =  "22050";
  
      $commands[18] =  out;
  
  
  
      int i;
  
      for (i = 0; i < numberOfArgs; i++) {
  
          log_message($commands[i]);
  
      }
  
      log_message("Printed all"); // lastly prints on here
  
  
  
      main(numberOfArgs, $commands); // stuck on here
  
      log_message("Finished cutting"); // not reach here
  
      free($commands);
  
      (*env)->ReleaseStringUTFChars(env, inputFile, in);
  
      (*env)->ReleaseStringUTFChars(env, outFile, out);
  
  
  
      return 0;
  
  }

  FFMPEG main function

  int main(int argc, char **argv)
  
  {
  
  int i, ret;
  
  int64_t ti;
  
  
  
  init_dynload();
  
  
  
  register_exit(ffmpeg_cleanup);
  
  
  
  setvbuf(stderr,NULL,_IONBF,0); /* win32 runtime needs this */
  
  
  
  av_log_set_flags(AV_LOG_SKIP_REPEATED);
  
  parse_loglevel(argc, argv, options);
  
  
  
  if(argc>1 && !strcmp(argv[1], "-d")){
  
      run_as_daemon=1;
  
      av_log_set_callback(log_callback_null);
  
      argc--;
  
      argv++;
  
  }
  
  
  
  avcodec_register_all();
  
  # if CONFIG_AVDEVICE
  
  avdevice_register_all();
  
  #endif
  
  avfilter_register_all();
  
  av_register_all();
  
  avformat_network_init();
  
  
  
  show_banner(argc, argv, options);
  
  
  
  /* parse options and open all input/output files */
  
  ret = ffmpeg_parse_options(argc, argv);
  
  if (ret < 0)
  
      exit_program(1);
  
  
  
  if (nb_output_files <= 0 && nb_input_files == 0) {
  
      show_usage();
  
      av_log(NULL, AV_LOG_WARNING, "Use -h to get full help or, even better, run 'man %s'\n", program_name);
  
      exit_program(1);
  
  }
  
  
  
  /* file converter / grab */
  
  if (nb_output_files <= 0) {
  
      av_log(NULL, AV_LOG_FATAL, "At least one output file must be specified\n");
  
      exit_program(1);
  
  }
  
  
  
  // if (nb_input_files == 0) {
  
  // av_log(NULL, AV_LOG_FATAL, "At least one input file must be specified\n");
  
  // exit_program(1);
  
  //     }
  
  
  
  for (i = 0; i < nb_output_files; i++) {
  
      if (strcmp(output_files[i]->ctx->oformat->name, "rtp"))
  
          want_sdp = 0;
  
  }
  
  
  
  current_time = ti = getutime();
  
  if (transcode() < 0)
  
      exit_program(1);
  
  ti = getutime() - ti;
  
  if (do_benchmark) {
  
      av_log(NULL, AV_LOG_INFO, "bench: utime=%0.3fs\n", ti / 1000000.0);
  
  }
  
  av_log(NULL, AV_LOG_DEBUG, "%"PRIu64" frames successfully decoded, %"PRIu64" decoding errors\n",
  
         decode_error_stat[0], decode_error_stat[1]);
  
  if ((decode_error_stat[0] + decode_error_stat[1]) * max_error_rate < decode_error_stat[1])
  
      exit_program(69);
  
  
  
  exit_program(received_nb_signals ? 255 : main_return_code);
  
  return main_return_code;
  
  }

  EDIT

  I debugged and found which line exiting me from the app. It is transcode() < 0 line But couldn’t find why ? Is there anyone to help me. I really need help. Can discuss and share more code.