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• FFMPEG audio/video livestream with html5 dashjs player : time is not sync

  14 avril 2017, par Dániel Kis

  I am going to create a live video & audio stream with ffmeg with libvpx-vp9 codec, and I want to view it from html5 browser with dashjs. But when the dashjs opens the video it seatches for chunks than not yet exits. It seems that the chunk counter is running in double speed in client side.

  Here is how I create the stream :

  VP9_LIVE_PARAMS="-speed 6 -tile-columns 4 -frame-parallel 1 -threads 8 -static-thresh 0 -max-intra-rate 300 -deadline realtime -lag-in-frames 0 -error-resilient 1"
  
  TARGET_PATH="/var/www/html/live/stream"
  
  
  
  ffmpeg \
  
    -thread_queue_size 8192 \
  
    -f v4l2 -input_format mjpeg -r 30 -s 640x360 -i /dev/video0 \
  
    -thread_queue_size 16384 \
  
    -f alsa -ar 44100 -ac 2 -i hw:1,0 \
  
    -map 0:0 \
  
    -pix_fmt yuv422p \
  
    -c:v libvpx-vp9 \
  
      -s 640x360 -keyint_min 60 -g 60 ${VP9_LIVE_PARAMS} \
  
      -b:v 300k \
  
    -f webm_chunk \
  
      -header "${TARGET_PATH}/glass_360.hdr" \
  
      -chunk_start_index 1 \
  
    "${TARGET_PATH}/glass_360_%d.chk" \
  
    -map 1:0 \
  
    -c:a libvorbis \
  
      -b:a 64k -ar 44100 \
  
    -f webm_chunk \
  
      -audio_chunk_duration 2000 \
  
      -header "${TARGET_PATH}/glass_171.hdr" \
  
      -chunk_start_index 1 \
  
    "${TARGET_PATH}/glass_171_%d.chk" \

  some seconds later I call the ffmpeg again to create manifest file :

  ffmpeg \
  
    -analyzeduration 1000\
  
    -f webm_dash_manifest -live 1 \
  
    -i "${TARGET_PATH}/glass_360.hdr" \
  
    -f webm_dash_manifest -live 1 \
  
    -i "${TARGET_PATH}/glass_171.hdr" \
  
    -c copy \
  
    -map 0 -map 1 \
  
    -f webm_dash_manifest -live 1 \
  
      -adaptation_sets "id=0,streams=0 id=1,streams=1" \
  
      -chunk_start_index 1 \
  
      -chunk_duration_ms 2000 \
  
      -time_shift_buffer_depth 7200 \
  
      -minimum_update_period 7200 \
  
    "${TARGET_PATH}/glass_live_manifest.mpd"

  My server’s clock is synced to "http://time.akamai.com/?iso"

  HTML5 player :

   
  
      
  
      
  
      
  
      
  
      
  
      <code class="echappe-js">&lt;script src=&quot;https://cdn.dashjs.org/latest/dash.all.min.js&quot;&gt;&lt;/script&gt;
  
  
    
  Live broadcast
    
  
     
  
         
     
     
  &lt;script&gt;<br />
  
                  var url = &quot;glass_live_manifest.mpd&quot;;<br />
  
                  var player = dashjs.MediaPlayer().create();<br />
  
                  player.initialize(document.querySelector(&quot;#videoPlayer&quot;), url, true);<br />
  
  <br />
  
     &lt;/script&gt;
     
    
   
  

• To large apk file when using .so files

  12 septembre 2014, par Arslan

  I am using a 3rd party API for camera library that is using ffmpeg frame recorder and .so files along with javacv.

  I am also using a 3rd party library for extracting meta data out from a video which also has some .so files

  When i merged all these files into only one folder "armeabi" my application did not work.
  So I have to copy all these files to all other folders "armeabi-v7a, mips, x86". Which works perfectly fine but obviously the size of the apk is now too large.

  Total size of these file are 20MB per folder. That make 80MB for all folder. My .apk size is 41MB. Please suggest ma what I can do to remove duplicate files/folders or reduce .apk size.

  Why I need all these folders armeabi, armeabi-v7a, mips, x86
  

  .so files in folder
  

• mp3 and multiple image convert to mp4 [on hold]

  16 mai 2017, par Henrik C Wiberg

  I need some guidance to convert an mp3 audio file, along with multiple photos to an mp4 file, using php/laravel.

  It must end with a mp4 file with a slideshow of images along with an audio file.

  How do you recommend me to begin the task ?
  I have this Json :

  {
  
  - data [
  
   {
  
      id: 1,
  
      name: "item 1",
  
      image: "image_1.jpg",
  
      start: "2017-01-01T02:00:00",
  
      end: "2017-01-01T02:30:00"
  
    },
  
    {
  
      id": 2,
  
      name: "item 2",
  
      image: "image_2.jpg",
  
      start: "2017-01-01T02:31:00",
  
      end: "2017-01-01T02:50:00"
  
    },
  
    {
  
      id": 3,
  
      name: "item 3",
  
      image: "image_3.jpg",
  
      start: "2017-01-01T02:51:00",
  
      end: "2017-01-01T03:00:00"
  
    }
  
  ],
  
  - meta {
  
     audiofile: {
  
      mp3: 'example.com/audio/audiofile.mp3',
  
      start: "2017-01-01T02:00:00",
  
      end: "2017-01-01T03:00:00"  
  
   }
  
  }   

  This json must be converted to one mp4 file, where image has to be placed and displayed on a timeline while ’audiofile.mp3’ is playing.

  Or do you know some code samples I can see ? :-)