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• How to prepare media stream to play using dash.js web player ?

  7 avril 2016, par Paweł Tobiszewski

  I want to stream media from nginx server to Android device and play it using web player embedded into web page. Player I want to use is dash.js.
  I play the same media also using different methods (MediaPlayer and ExoPlayer) and they are working great. But when I try to use dash.js, I faced problem with codecs - they are not supported.
  I prepare my streams using ffmpeg and MP4Box, I also tried different codecs, like libx264, x264, x265 - always with the same effect.
  My based media are video in Y4M format and audio in WAV.
  How to encode it to use it in dash.js player ?

  EDIT :
  I get error "Video Element Error : MEDIA_ERR_DECODE" while trying to decode video stream.

  Here is full log :

  [16] EME detected on this user agent! (ProtectionModel_21Jan2015) 
  
  [19] Playback Initialized 
  
  [28] [dash.js 2.0.0] MediaPlayer has been initialized 
  
  [102] Parsing complete: ( xml2json: 3ms, objectiron: 3ms, total: 0.006s) 
  
  [103] Manifest has been refreshed at Thu Apr 07 2016 22:02:52 GMT+0200 (CEST)[1460059372.696]  
  
  [107] SegmentTimeline detected using calculated Live Edge Time 
  
  [118] MediaSource is open! 
  
  [118] [object Event] 
  
  [119] Duration successfully set to: 18.58 
  
  [119] Added 0 inline events 
  
  [120] video codec: video/mp4;codecs="avc1.640032" 
  
  [132] Schedule controller stopping for video 
  
  [137] No audio data. 
  
  [137] No text data. 
  
  [137] No fragmentedText data. 
  
  [137] No embeddedText data. 
  
  [138] No muxed data. 
  
  [139] Start Event Controller 
  
  [141] Schedule controller starting for video 
  
  [143] Native video element event: play 
  
  [144] Schedule controller starting for video 
  
  [148] loaded video:InitializationSegment:NaN (200, 0ms, 7ms) 
  
  [149] Initialization finished loading 
  
  [154] Getting the request for video time : 0 
  
  [155] SegmentList: 0 / 18.58 
  
  [164] loaded video:MediaSegment:0 (200, 7ms, 1ms) 
  
  [169] Native video element event: loadedmetadata 
  
  [171] Starting playback at offset: 0 
  
  [175] Got enough buffer to start. 
  
  [175] Buffered Range: 0 - 0.999999 
  
  [179] Requesting seek to time: 0 
  
  [181] Prior to making a request for time, NextFragmentRequestRule is aligning index handler's currentTime with bufferedRange.end. 0  was changed to  0.999999 
  
  [182] Getting the request for video time : 0.999999 
  
  [183] SegmentList: 0 / 18.58 
  
  [183] Getting the next request at index: 1 
  
  [184] SegmentList: 1 / 18.58 
  
  [190] loaded video:MediaSegment:1 (200, 5ms, 0ms) 
  
  [192] Buffered Range: 0 - 0.999999 
  
  [195] Getting the request for video time : 2 
  
  [196] Index for video time 2 is 1 
  
  [197] SegmentList: 1 / 18.58 
  
  [197] Getting the next request at index: 2 
  
  [198] SegmentList: 2 / 18.58 
  
  [205] loaded video:MediaSegment:2 (200, 4ms, 1ms) 
  
  [207] Buffered Range: 0 - 0.999999 
  
  [207] Getting the request for video time : 3 
  
  [208] Index for video time 3 is 2 
  
  [208] SegmentList: 2 / 18.58 
  
  [209] Getting the next request at index: 3 
  
  [209] SegmentList: 3 / 18.58 
  
  [212] Video Element Error: MEDIA_ERR_DECODE 
  
  [212] [object MediaError] 
  
  [215] Schedule controller stopping for video 
  
  [219] Native video element event: pause 

• ffmpeg av_interleaved_write_frame() : Broken pipe under windows

  7 avril 2016, par Allen

  I am using ffmpeg to convert original media file to rawvideo yuv format, ouputed the yuv to pipe, then my command tool receive the raw yuv as input, do some processing.

  e.g :

  D:\huang_xuezhong\build_win32_VDNAGen>ffmpeg -i test.mkv -c:v rawvideo -s 320x240 -f rawvideo - | my_tool -o output

  every time, when run the command, ffmpeg will dump this av_interleaved_write_frame(): Broken pipe error msg :

  Output #0, rawvideo, to 'pipe:':
  
    Metadata:
  
    encoder         : Lavf56.4.101
  
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 320x240 [SAR 120:91 DAR 160:91], q=2-31, 200 kb/s, 24 fps, 24 tbn, 24 tbc (default)
  
    Metadata:
  
        encoder         : Lavc56.1.100 rawvideo
  
    Stream mapping:
  
        Stream #0:0 -> #0:0 (h264 (native) -> rawvideo (native))
  
  Press [q] to stop, [?] for help
  
  av_interleaved_write_frame(): Broken pipe
  
  frame=    1 fps=0.0 q=0.0 Lsize=     112kB time=00:00:00.04 bitrate=22118.2kbits/s
  
  video:112kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing o
  
  verhead: 0.000000%
  
  Conversion failed!

  in my souce code : it take stdin as the input file, every time, it read a frame size content from it, if the content read is less than a frame size, then continue read, until a frame is fetched, then it use the frame content to generate something.

  int do_work (int jpg_width, int jpg_height) 
  
  {
  
  int ret = 0;
  
  
  
  FILE *yuv_fp = NULL;
  
  unsigned char * yuv_buf = NULL;
  
  int frame_size = 0;
  
  int count = 0;
  
  int try_cnt = 0;
  
  
  
  frame_size = jpg_width * jpg_height * 3 / 2;
  
  va_log (vfp_log, "a frame size:%d\n", frame_size);
  
  
  
  yuv_fp = stdin;
  
  
  
  yuv_buf = (unsigned char *) aligned_malloc_int(
  
          sizeof(char) * (jpg_width + 1) * (jpg_height + 1) * 3, 128);
  
  
  
  if (!yuv_buf) {
  
      fprintf (stderr, "malloc yuv buf error\n");
  
      goto end;
  
  } 
  
  
  
  memset (yuv_buf, 0, frame_size);
  
  while (1) {
  
  
  
      try_cnt++;
  
      va_log (vfp_log, "try_cnt is %d\n", try_cnt);
  
  
  
      //MAX_TRY_TIMES = 10
  
      if (try_cnt > MAX_TRY_TIMES) {
  
          va_log (vfp_log, "try time out\n");
  
          break;
  
      }
  
  
  
      count = fread (yuv_buf + last_pos, 1, frame_size - last_pos, yuv_fp);
  
      if (last_pos + count < frame_size) {
  
          va_log (vfp_log, "already read yuv: %d, this time:%d\n", last_pos + count, count);
  
          last_pos += count;
  
          continue;
  
      }
  
  
  
      // do my work here
  
  
  
      memset (yuv_buf, 0, frame_size);
  
      last_pos = 0;
  
      try_cnt = 0;
  
  }
  
  
  
  end:
  
  if (yuv_buf) {
  
      aligned_free_int (yuv_buf);
  
  }
  
  
  
  return ret;
  
  }

  my log :

  2016/04/05 15:20:38 : a frame size:115200
  2016/04/05 15:20:38 : try_cnt is 1
  2016/04/05 15:20:38 : already read yuv : 49365, this time:49365
  2016/04/05 15:20:38 : try_cnt is 2
  2016/04/05 15:20:38 : already read yuv : 49365, this time:0
  2016/04/05 15:20:38 : try_cnt is 3
  2016/04/05 15:20:38 : already read yuv : 49365, this time:0
  2016/04/05 15:20:38 : try_cnt is 4
  2016/04/05 15:20:38 : already read yuv : 49365, this time:0
  2016/04/05 15:20:38 : try_cnt is 5
  2016/04/05 15:20:38 : already read yuv : 49365, this time:0
  2016/04/05 15:20:38 : try_cnt is 6
  2016/04/05 15:20:38 : already read yuv : 49365, this time:0
  2016/04/05 15:20:38 : try_cnt is 7
  2016/04/05 15:20:38 : already read yuv : 49365, this time:0
  2016/04/05 15:20:38 : try_cnt is 8
  2016/04/05 15:20:38 : already read yuv : 49365, this time:0
  2016/04/05 15:20:38 : try_cnt is 9
  2016/04/05 15:20:38 : already read yuv : 49365, this time:0
  2016/04/05 15:20:38 : try_cnt is 10
  2016/04/05 15:20:38 : already read yuv : 49365, this time:0
  2016/04/05 15:20:38 : try_cnt is 11
  2016/04/05 15:20:38 : try time out
  ```

  my question :

  when piping used ,does ffmpeg write content to pipe buffer as soon as it has content, or it will buffer some size content, then flushes them to pipe ?Maybe some internal logic that I misunderstood,any one could help explain or fix my code ?

  PS : this command run ok under linux.

• Anomalie #3769 : form_hidden insère un hidden en trop

  13 avril 2016, par jluc -

  Pour info voilà ce que ça affiche ( le probleme est le id_truc hidden dans le dernier résultat)

  ENV=
  Array
  (
  [page] => truc
  [id_truc] => 10
  [type-page] => truc
  [date] => 2016-04-13 19:25:44
  [date_default] => 1
  [date_redac] => 2016-04-13 19:25:44
  [date_redac_default] => 1
  )
  SELF
  ./ ?page=truc&id_truc=10
  SELF|form_hidden
  />/>
  url_pagetagada
  spip.php ?page=tagada
  URL_PAGEtagada|form_hidden
  />/>