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• FFMPEG API (compiling with specific formats)

  14 janvier 2012, par JS.

  I am trying to compile FFMPEG to support a single video type (*.mp4).

  I have everything working when I compile for all, but I do not want the extra over-head when I will only use a single format.

  Here's my compile FLAGS now (non-working for MP4). I am sure there are other codecs/decoders I need to specifically enable, but am just having a hard time finding them.

  Compiler directives showing the build flags below :

  FLAGS="$FLAGS --disable-everything"
  
  FLAGS="$FLAGS --enable-encoder=mpeg4video" ## This is the question, what all needs enabling?

  I just do not know video standards well enough to know exactly which codecs / encoders / etc. to turn on.

  av_register_all();
  
  avdevice_register_all();
  
  
  
  byteCtx = av_alloc_put_byte(buffer, BUFFER_SIZE, 0, f, ReadFunc, NULL, SeekFunc);
  
  if (!byteCtx) {
  
      return;
  
  }
  
  // Open video file (here's the failure, doesn't happen when compiled for all)
  
  inputFormat = av_find_input_format("MP4");
  
  if (!inputFormat) {
  
      LOGE(ANDROID_LOG_ERROR, "NDK:", "Null inputformat!");
  
      return;
  
  }

• FFMPEG Formating all videos in a folder to be the same for concating

  20 mars 2018, par borobosis

  Ok so I’m trying to make a programm that takes the mp4 files in a folder and formats them to be the same ratio and framerate to simplify concating.

  This is what I have so far.

  #!/bin/bash
  
  NUMBER=0
  
  MP=".mp4"
  
  OUT="./Media/Rescaled/"
  
  for filename in ./Media/*.mp4; do
  
      echo "$filename"
  
      NAME=$(basename "$filename" .mp4)
  
      NEWNAME=$NAME$NUMBER$MP
  
      let "NUMBER += 1"
  
      ffmpeg -i "$filename" -y -r 24 -vf scale=640:640  $OUT$NEWNAME
  
  done

  I receive 2 errors that I can’t really get my head around as of now :

  The encoder 'aac' is experimental but experimental codecs are not enabled,                 
  
  add '-strict -2' if you want to use it.

  which I first of all am not sure where to put in and second of all have heard it messes with audio quality and

  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x19434c0] Format mov,mp4,m4a,3gp,3g2,mj2  
  
  detected only with low score of 1, misdetection possible!
  
  
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x19434c0] moov atom not found
  
  ./Media/Whitenoise.mp4: Invalid data found when processing input

  I am absolutely a novice at this, so I would appreciate answers with an explanation or pointing me to something that explains it well as I’ve been having trouble finding good ffmpeg material.

  Thanks for reading through this !

• FFMPEG with dashjs

  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.

  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;