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• Q : Bash script infinite loop causing ffmpeg spam

  6 juillet 2017, par Kārlis K.

  Can’t seem to figure this one out... I have a set up NGINX server with the excellent RTMP extension and everything is working fine. However, I’m trying to restream/push a copy of a couple specific streams that need to be streamed in another RTMP stream application (specifically, these streams are streamed to application "static" but in the current situation also need to be pushed over to "live"). The process of restreaming/pushing a stream in NGINX-RTMP is relatively simple, however, in my case I need to selectively push a couple of streams instead of every stream being streamed to the application "static".

  Idea is to have NGINX-RTMP pass the stream name off to the bash script, which then does the restreaming without interrupting any other streams or services.

  With some success, I’ve tried doing this by creating a bash scrip..

  The relevant NGINX config bit that runs the bash script is :

  exec_publish /etc/nginx/rtmp_conf.d/stream_id.sh $name;

  I tried it with an "if / else"

  if [ $1 == "stream_name_1" ]; then
  
          ffmpeg -re -i rtmp://127.0.0.1:2000/static/stream_name_1 -vcodec libx264 -acodec copy -f flv rtmp://127.0.0.1:2000/live/live_0
  
  elif [ $1 == "stream_name_2" ]; then
  
          ffmpeg -re -i rtmp://127.0.0.1:2000/static/stream_name_2 -vcodec libx264 -acodec copy -f flv rtmp://127.0.0.1:2000/live/live_1
  
  elif [ $1 == "stream_name_3" ]; then
  
          ffmpeg -re -i rtmp://127.0.0.1:2000/static/stream_name_3 -vcodec libx264 -acodec copy -f flv rtmp://127.0.0.1:2000/live/live_2
  
  elif [ $1 == "stream_name_4" ]; then
  
          ffmpeg -re -i rtmp://127.0.0.1:2000/static/stream_name_4 -vcodec libx264 -acodec copy -f flv rtmp://127.0.0.1:2000/live/live_3
  
  else
  
          echo "FAIL" >> /etc/nginx/rtmp_conf.d/stream.log && echo date > /etc/nginx/rtmp_conf.d/stream.log
  
          exit
  
  fi

  And I tried it with Switches

  case "$1" in
  
          "stream_name_1")
  
              ffmpeg -re -i rtmp://127.0.0.1:2000/static/stream_name_1 -vcodec libx264 -acodec copy -f flv rtmp://127.0.0.1:2000/live/live_0
  
          ;;
  
          "stream_name_2")
  
              ffmpeg -re -i rtmp://127.0.0.1:2000/static/stream_name_2 -vcodec libx264 -acodec copy -f flv rtmp://127.0.0.1:2000/live/live_1
  
          ;;
  
          "stream_name_3")
  
              ffmpeg -re -i rtmp://127.0.0.1:2000/static/stream_name_3 -vcodec libx264 -acodec copy -f flv rtmp://127.0.0.1:2000/live/live_2
  
          ;;
  
          "stream_name_4")
  
              ffmpeg -re -i rtmp://127.0.0.1:2000/static/stream_name_4 -vcodec libx264 -acodec copy -f flv rtmp://127.0.0.1:2000/live/live_3
  
          ;;
  
          echo "FAIL " >> /etc/nginx/rtmp_conf.d/stream.log && echo date > /etc/nginx/rtmp_conf.d/stream.log
  
  esac

  Problem with both is that they both end up spamming a ton of ffmpeg processes ... and I don’t know why - I’ve tried changing the code but I either end up with ffmpeg not firing at all or spamming the server.

• Q : Bash scrip infinite loop causing ffmpeg spam

  6 juillet 2017, par Kārlis K.

  Can’t seem to figure this one out... I have a set up NGINX server with the excellent RTMP extension and everything is working fine. However, I’m trying to restream/push a copy of a couple specific streams that need to be streamed in another RTMP stream application (specifically, these streams are streamed to application "static" but in the current situation also need to be pushed over to "live"). The process of restreaming/pushing a stream in NGINX-RTMP is relatively simple, however, in my case I need to selectively push a couple of streams instead of every stream being streamed to the application "static".

  Idea is to have NGINX-RTMP pass the stream name off to the bash script, which then does the restreaming without interrupting any other streams or services.

  With some success, I’ve tried doing this by creating a bash scrip..

  The relevant NGINX config bit that runs the bash script is :

  exec_publish /etc/nginx/rtmp_conf.d/stream_id.sh $name;

  I tried it with an "if / else"

  if [ $1 == "stream_name_1" ]; then
  
          ffmpeg -re -i rtmp://127.0.0.1:2000/static/stream_name_1 -vcodec libx264 -acodec copy -f flv rtmp://127.0.0.1:2000/live/live_0
  
  elif [ $1 == "stream_name_2" ]; then
  
          ffmpeg -re -i rtmp://127.0.0.1:2000/static/stream_name_2 -vcodec libx264 -acodec copy -f flv rtmp://127.0.0.1:2000/live/live_1
  
  elif [ $1 == "stream_name_3" ]; then
  
          ffmpeg -re -i rtmp://127.0.0.1:2000/static/stream_name_3 -vcodec libx264 -acodec copy -f flv rtmp://127.0.0.1:2000/live/live_2
  
  elif [ $1 == "stream_name_4" ]; then
  
          ffmpeg -re -i rtmp://127.0.0.1:2000/static/stream_name_4 -vcodec libx264 -acodec copy -f flv rtmp://127.0.0.1:2000/live/live_3
  
  else
  
          echo "FAIL" >> /etc/nginx/rtmp_conf.d/stream.log && echo date > /etc/nginx/rtmp_conf.d/stream.log
  
          exit
  
  fi

  And I tried it with Switches

  case "$1" in
  
          "stream_name_1")
  
              ffmpeg -re -i rtmp://127.0.0.1:2000/static/stream_name_1 -vcodec libx264 -acodec copy -f flv rtmp://127.0.0.1:2000/live/live_0
  
          ;;
  
          "stream_name_2")
  
              ffmpeg -re -i rtmp://127.0.0.1:2000/static/stream_name_2 -vcodec libx264 -acodec copy -f flv rtmp://127.0.0.1:2000/live/live_1
  
          ;;
  
          "stream_name_3")
  
              ffmpeg -re -i rtmp://127.0.0.1:2000/static/stream_name_3 -vcodec libx264 -acodec copy -f flv rtmp://127.0.0.1:2000/live/live_2
  
          ;;
  
          "stream_name_4")
  
              ffmpeg -re -i rtmp://127.0.0.1:2000/static/stream_name_4 -vcodec libx264 -acodec copy -f flv rtmp://127.0.0.1:2000/live/live_3
  
          ;;
  
          echo "FAIL " >> /etc/nginx/rtmp_conf.d/stream.log && echo date > /etc/nginx/rtmp_conf.d/stream.log
  
  esac

  Problem with both is that they both end up spamming a ton of ffmpeg processes ... and I don’t know why - I’ve tried changing the code but I either end up with ffmpeg not firing at all or spamming the server.

• Why audio element currentTime on ffmpeg encoded mp3 file in Chrome browser does not work

  26 juillet 2013, par Peter

  I have an HTML5 audio element :

  <audio preload="auto">
  
      <source src="./Sound/recording.mp3" type="audio/mpeg">
  
  </source></audio>

  and I need to be able to play last 4 seconds from mp3 recording. My javaScript is :

  audio.currentTime = audio.duration-4;
  
  audio.play();

  Works ok in IE10 and Firefox, but Chrome starts playing from a wrong place. The difference between reported audio.currentTime and actual playback position is about 20s. The recording.mp3 is created with ffmpeg :

  ffmpeg -i recording.wav -ab 32k recording.mp3

  It works, when I strip the ID3v2 header from the recording.mp3 (deleting the first couple bytes in the file before the audio data).

  It also works when I compress to ogg. Can somebody point me to the right direction (ffmpeg switches, audio element attributes or whatever) to get it work also in chrome ?

  Thanks in advance

  EDIT :
  the ffmpeg output :

  ffmpeg version N-53528-g160ea26 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on May 27 2013 15:20:09 with gcc 4.7.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
  
  amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
  
  enable-libxvid --enable-zlib
  
    libavutil      52. 34.100 / 52. 34.100
  
    libavcodec     55. 12.100 / 55. 12.100
  
    libavformat    55.  7.100 / 55.  7.100
  
    libavdevice    55.  1.101 / 55.  1.101
  
    libavfilter     3. 72.100 /  3. 72.100
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [wav @ 0433e840] max_analyze_duration 5000000 reached at 5015510 microseconds
  
  Guessed Channel Layout for  Input Stream #0.0 : mono
  
  Input #0, wav, from 'recording.wav':
  
    Duration: 02:30:07.86, bitrate: 176 kb/s
  
      Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 11025 Hz, mono, s16, 176 kb/s
  
  Output #0, mp3, to 'recording.mp3':
  
    Metadata:
  
      TSSE            : Lavf55.7.100
  
      Stream #0:0: Audio: mp3 (libmp3lame), 11025 Hz, mono, s16p, 32 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (pcm_s16le -> libmp3lame)
  
  Press [q] to stop, [?] for help
  
  size=   35188kB time=02:30:07.86 bitrate=  32.0kbits/s
  
  video:0kB audio:35187kB subtitle:0 global headers:0kB muxing overhead 0.000672%