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• ffmpeg radio live transcoding mp3/aac to g722

  13 mai 2017, par p3tter

  I have tried to transcode a radio stream with ffmpeg to g722.
  I get the stream to work and im able to listen to the stream.
  The problem is that the output stream have faster speed than the input stream.
  so the result is not good. I have tried to slow down the speed with atempo without any luck.

  like :

  size=     241kB time=00:00:28.67 bitrate=  68.8kbits/s speed= 1.4x

  this varies from 1.x to 15.x

  Console output :

  c:\ffmpeg\bin>ffmpeg -i http://lyd.nrk.no/nrk_radio_mp3_mp3_l -ac 1 -acodec g722 -f rtp -ab 64k -ar 16k rtp://192.168.0.99:555
  
  ffmpeg version N-85750-ga75ef15 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 6.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 61.100 / 55. 61.100
  
    libavcodec     57. 93.100 / 57. 93.100
  
    libavformat    57. 72.101 / 57. 72.101
  
    libavdevice    57.  7.100 / 57.  7.100
  
    libavfilter     6. 88.100 /  6. 88.100
  
    libswscale      4.  7.101 /  4.  7.101
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
  Input #0, mp3, from 'http://lyd.nrk.no/nrk_radio_mp3_mp3_l':
  
    Metadata:
  
      icy-name        : NRK mP3
  
      icy-pub         : 1
  
    Duration: N/A, start: 0.000000, bitrate: 96 kb/s
  
      Stream #0:0: Audio: mp3, 48000 Hz, stereo, s16p, 96 kb/s
  
  [udp @ 000000000244bec0] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
  
  [udp @ 00000000024781a0] 'circular_buffer_size' option was set but it is not supported on this build (pthread support is required)
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mp3 (native) -> adpcm_g722 (g722))
  
  Press [q] to stop, [?] for help
  
  Output #0, rtp, to 'rtp://192.168.0.99:555':
  
    Metadata:
  
      icy-name        : NRK mP3
  
      icy-pub         : 1
  
      encoder         : Lavf57.72.101
  
      Stream #0:0: Audio: adpcm_g722 (g722), 16000 Hz, mono, s16, 64 kb/s
  
      Metadata:
  
        encoder         : Lavc57.93.100 g722
  
  SDP:
  
  v=0
  
  o=- 0 0 IN IP4 127.0.0.1
  
  s=No Name
  
  c=IN IP4 192.168.0.99
  
  t=0 0
  
  a=tool:libavformat 57.72.101
  
  m=audio 555 RTP/AVP 9
  
  b=AS:64
  
  
  
  size=     413kB time=00:00:49.17 bitrate=  68.8kbits/s speed=1.43x

  Does anyone know what im doing wrong ?
  Thanks

• FFMPEG sepia filter

  24 avril 2017, par Alex Konetchy

  Can’t seem to figure out why my colorchannelmixer filter is not working with ffmpeg. It doesn’t appear to output any errors, but the ouput.mp4 video is just a 0 second long video with no thumbnail.

  Here’s the command I’m trying.

  ffmpeg -i video.mp4 -filter_complex \
  
  "[0:v] colorchannelmixer=.393:.769:.189:0:.349:.686:.168:0:.272:.534:.131[f1];\
  
  [f1] eq=1.0:0:1.3:2.4:1.0:1.0:1.0:1.0 [outv]" -map "[outv]" output.mp4

  And the output I receive.

  ffmpeg version 2.8.4 Copyright (c) 2000-2015 the FFmpeg developers
  
        built with gcc 5.2.0 (GCC)
  
        configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
  
        libavutil      54. 31.100 / 54. 31.100
  
        libavcodec     56. 60.100 / 56. 60.100
  
        libavformat    56. 40.101 / 56. 40.101
  
        libavdevice    56.  4.100 / 56.  4.100
  
        libavfilter     5. 40.101 /  5. 40.101
  
        libswscale      3.  1.101 /  3.  1.101
  
        libswresample   1.  2.101 /  1.  2.101
  
        libpostproc    53.  3.100 / 53.  3.100
  
      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
  
        Metadata:
  
          major_brand     : mp42
  
          minor_version   : 1
  
          compatible_brands: mp41mp42isom
  
          creation_time   : 2017-04-18 20:22:52
  
        Duration: 00:00:59.20, start: 0.000000, bitrate: 5045 kb/s
  
          Stream #0:0(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 2 kb/s (default)
  
          Metadata:
  
            creation_time   : 2017-04-18 20:22:52
  
            handler_name    : Core Media Audio
  
          Stream #0:1(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 5038 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc (default)
  
          Metadata:
  
            creation_time   : 2017-04-18 20:22:52
  
            handler_name    : Core Media Video
  
      File 'output.mp4' already exists. Overwrite ? [y/N] y
  
      No pixel format specified, yuv444p for H.264 encoding chosen.
  
      Use -pix_fmt yuv420p for compatibility with outdated media players.
  
      [libx264 @ 04f1b8e0] using SAR=1/1
  
      [libx264 @ 04f1b8e0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 AVX2 LZCNT BMI2
  
      [libx264 @ 04f1b8e0] profile High 4:4:4 Predictive, level 4.0, 4:4:4 8-bit
  
      [libx264 @ 04f1b8e0] 264 - core 148 r2638 7599210 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=4 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
      Output #0, mp4, to 'output.mp4':
  
        Metadata:
  
          major_brand     : mp42
  
          minor_version   : 1
  
          compatible_brands: mp41mp42isom
  
          encoder         : Lavf56.40.101
  
          Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv444p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 25 fps, 12800 tbn, 25 tbc (default)
  
          Metadata:
  
            encoder         : Lavc56.60.100 libx264
  
      Stream mapping:
  
        Stream #0:1 (h264) -> colorchannelmixer
  
        eq -> Stream #0:0 (libx264)
  
      Press [q] to stop, [?] for help
  
      frame=   50 fps=4.7 q=-1.0 Lsize=     281kB time=00:00:01.92 bitrate=1197.3kbits/s
  
      video:279kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.502929%
  
      [libx264 @ 04f1b8e0] frame I:1     Avg QP:19.00  size: 51169
  
      [libx264 @ 04f1b8e0] frame P:13    Avg QP:20.60  size: 10882
  
      [libx264 @ 04f1b8e0] frame B:36    Avg QP:23.29  size:  2572
  
      [libx264 @ 04f1b8e0] consecutive B-frames:  2.0%  4.0%  6.0% 88.0%
  
      [libx264 @ 04f1b8e0] mb I  I16..4: 25.5% 63.4% 11.1%
  
      [libx264 @ 04f1b8e0] mb P  I16..4:  2.7%  2.8%  0.2%  P16..4: 22.7%  5.4%  2.7%  0.0%  0.0%    skip:63.5%
  
      [libx264 @ 04f1b8e0] mb B  I16..4:  0.3%  0.5%  0.0%  B16..8: 17.2%  0.7%  0.0%  direct: 0.1%  skip:81.1%  L0:43.6% L1:55.1% BI: 1.4%
  
      [libx264 @ 04f1b8e0] 8x8 transform intra:58.3% inter:91.1%
  
      [libx264 @ 04f1b8e0] coded y,u,v intra: 25.2% 10.1% 12.0% inter: 2.7% 0.5% 0.6%
  
      [libx264 @ 04f1b8e0] i16 v,h,dc,p: 44% 36% 13%  8%
  
      [libx264 @ 04f1b8e0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 20% 42%  3%  2%  2%  4%  3%  3%
  
      [libx264 @ 04f1b8e0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 29% 26% 12%  4%  6%  6%  9%  5%  3%
  
      [libx264 @ 04f1b8e0] Weighted P-Frames: Y:0.0% UV:0.0%
  
      [libx264 @ 04f1b8e0] ref P L0: 61.3%  6.1% 22.1% 10.5%
  
      [libx264 @ 04f1b8e0] ref B L0: 78.5% 16.8%  4.6%
  
      [libx264 @ 04f1b8e0] ref B L1: 94.9%  5.1%
  
      [libx264 @ 04f1b8e0] kb/s:1140.95

• Use deck.js as a remote presentation tool

  8 janvier 2014, par silvia

  deck.js is one of the new HTML5-based presentation tools. It’s simple to use, in particular for your basic, every-day presentation needs. You can also create more complex slides with animations etc. if you know your HTML and CSS.

  Yesterday at linux.conf.au (LCA), I gave a presentation using deck.js. But I didn’t give it from the lectern in the room in Perth where LCA is being held – instead I gave it from the comfort of my home office at the other end of the country.

  I used my laptop with in-built webcam and my Chrome browser to give this presentation. Beforehand, I had uploaded the presentation to a Web server and shared the link with the organiser of my speaker track, who was on site in Perth and had set up his laptop in the same fashion as myself. His screen was projecting the Chrome tab in which my slides were loaded and he had hooked up the audio output of his laptop to the room speaker system. His camera was pointed at the audience so I could see their reaction.

  I loaded a slide master URL :
  http://html5videoguide.net/presentations/lca_2014_webrtc/?master
  and the room loaded the URL without query string :
  http://html5videoguide.net/presentations/lca_2014_webrtc/.

  Then I gave my talk exactly as I would if I was in the same room. Yes, it felt exactly as though I was there, including nervousness and audience feedback.

  How did we do that ? WebRTC (Web Real-time Communication) to the rescue, of course !

  We used one of the modules of the rtc.io project called rtc-glue to add the video conferencing functionality and the slide navigation to deck.js. It was actually really really simple !

  Here are the few things we added to deck.js to make it work :

  • Code added to index.html to make the video connection work :

    <meta name="rtc-signalhost" content="http://rtc.io/switchboard/">
    
    <meta name="rtc-room" content="lca2014">
    
    ...
    
    <video id="localV" rtc-capture="camera" muted></video>
    
    <video id="peerV" rtc-peer rtc-stream="localV"></video>
    
    ...
    
    <script src="glue.js"></script>
    
    <script>
    
    glue.config.iceServers = [{ url: 'stun:stun.l.google.com:19302' }];
    
    </script>

    The iceServers config is required to punch through firewalls – you may also need a TURN server. Note that you need a signalling server – in our case we used http://rtc.io/switchboard/, which runs the code from rtc-switchboard.

  • Added glue.js library to deck.js :

    Downloaded from https://raw.github.com/rtc-io/rtc-glue/master/dist/glue.js into the source directory of deck.js.

  • Code added to index.html to synchronize slide navigation :

    glue.events.once('connected', function(signaller) {
    
      if (location.search.slice(1) !== '') {
    
        $(document).bind('deck.change', function(evt, from, to) {
    
          signaller.send('/slide', {
    
            idx: to,
    
            sender: signaller.id
    
          });
    
        });
    
      }
    
      signaller.on('slide', function(data) {
    
        console.log('received notification to change to slide: ', data.idx);
    
        $.deck('go', data.idx);
    
      });
    
    });

    This simply registers a callback on the slide master end to send a slide position message to the room end, and a callback on the room end that initiates the slide navigation.

  And that’s it !

  You can find my slide deck on GitHub.

  Feel free to write your own slides in this manner – I would love to have more users of this approach. It should also be fairly simple to extend this to share pointer positions, so you can actually use the mouse pointer to point to things on your slides remotely. Would love to hear your experiences !

  Note that the slides are actually a talk about the rtc.io project, so if you want to find out more about these modules and what other things you can do, read the slide deck or watch the talk when it has been published by LCA.

  Many thanks to Damon Oehlman for his help in getting this working.

  BTW : somebody should really fix that print style sheet for deck.js – I’m only ever getting the one slide that is currently showing.