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• FFMPEG MKV Causing Errors in DASH JS

  24 juin 2018, par Mike

  I’m getting the following browser errors (on all browsers) using Dash JS when transcoding and MKV file :

  ERROR DOMException: Failed to read the 'buffered' property from 'SourceBuffer': This SourceBuffer has been removed from the parent media source.

  and...

  dash.all.min.js:26 Uncaught (in promise) DOMException: Failed to load because no supported source was found.

  What’s weird is I have no issues when I transcode a MP4 file. I’m using FFMPEG in conjunction with Bento4 to build MPEG DASH and HLS files for my video player.

  What I did to single out FFMPEG was to transcode a video that gave me errors on my test server on my local machine (which works) and start the Bento4 process on that file. Doing that, I had no issues and everything played just fine.

  I have removed FFMPEG and reinstalled it multiple times and I always get the same result. I’m sure I screwed something up on my server, but for the life of me I can’t seem to figure out where to start with fixing the issue.

  FFMPEG Version

  ffmpeg version N-91321-ge85c608 Copyright (c) 2000-2018 the FFmpeg developers
  
  
  
  built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-28)
  
  
  
  configuration: 
  
  --prefix=/root/ffmpeg_build 
  
  --pkg-config-flags=--static 
  
  --extra-cflags=-I/root/ffmpeg_build/include 
  
  --extra-ldflags=-L/root/ffmpeg_build/lib 
  
  --extra-libs=-lpthread 
  
  --extra-libs=-lm 
  
  --bindir=/root/bin 
  
  --enable-gpl 
  
  --enable-libfdk_aac 
  
  --enable-libfreetype 
  
  --enable-libmp3lame 
  
  --enable-libopus 
  
  --enable-libvorbis 
  
  --enable-libtheora 
  
  --enable-libx264 
  
  --enable-nonfree
  
  libavutil      56. 18.102 / 56. 18.102
  
  libavcodec     58. 20.102 / 58. 20.102
  
  libavformat    58. 17.100 / 58. 17.100
  
  libavdevice    58.  4.101 / 58.  4.101
  
  libavfilter     7. 25.100 /  7. 25.100
  
  libswscale      5.  2.100 /  5.  2.100
  
  libswresample   3.  2.100 /  3.  2.100
  
  libpostproc    55.  2.100 / 55.  2.100

  FFMPEG Command

  ffmpeg 
  
  -i ${DIRECTORY}/${INPUT_FILE} 
  
  -progress ${DIRECTORY}/transcode.log 
  
  -s 1920x1080 
  
  -c:v libx264 
  
  -b:v 3000k 
  
  -c:a aac 
  
  -b:a 32k 
  
  -minrate 3000k 
  
  -maxrate 3000k 
  
  -bufsize 6000k 
  
  -g 96 
  
  -keyint_min 96 
  
  -sc_threshold 0 
  
  -profile:v high 
  
  -flags +cgop 
  
  -movflags faststart 
  
  -preset ultrafast 
  
  -pix_fmt yuv420p 
  
  ${DIRECTORY}/ffmpeg_1920_1080_3000.mp4 &> ${DIRECTORY}/ffmpeg.log

  Also, I get no errors and and if I access the output files directly, they play just fine.

  I’m sure I’m not including all the information needed to troubleshoot this, so let me know if there is better information I can provide.

  What would cause FFMPEG to transcode MP4 and not MKV ?

  EDIT
  One last thing, I converted the MKV to an MP4 then used the above command and it worked. It’s like MP4 to MP4 is fine, but MKV to MP4 is broke.

• avformat/dashdec : Fix for ticket 7149 (Segfault when decoding dash streams)

  24 mai 2018, par Colin NG

  avformat/dashdec : Fix for ticket 7149 (Segfault when decoding dash streams)
  Add NULL pointer check for init_section
  

  • [DH] libavformat/dashdec.c

• 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