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• Transcoding from VP8 to H264 is not working using fluent-ffmpeg library using node.js

  3 septembre 2019, par Mihir Patel

  I have tried transcoding stream from VP8 to H264 using command line it’s working fine but when I tried the same thing using fluent-ffmpeg it is not working as expected.

  Version information

  fluent-ffmpeg version : "2.1.2"

  ffmpeg version : "3.4.4-1 16.04.york0"

  OS : "Ubuntu"

  Trasncoding from VP8 to H264 is working using command

  ffmpeg -analyzeduration 300M -probesize 300M -protocol_whitelist file,udp,rtp -i portal-vp8.sdp -c:v libx264 -profile:v high -level:v 3.2 -pix_fmt yuv420p -x264-params keyint=25:scenecut=0 -r 25 -c:a aac -ar 16k -ac 1 -preset ultrafast -tune zerolatency -f flv rtmp://my-server-ip/myapp/testvp8

  My sdp is

  v=0
  
  o=- 0 0 IN IP4 127.0.0.1
  
  s=No Name
  
  c=IN IP4 127.0.0.1
  
  t=0 0
  
  a=tool:libavformat 55.2.100
  
  m=audio 5396 TCP 111
  
  a=rtpmap:111 opus/48000
  
  m=video 5398 RTP/AVP 100
  
  a=rtpmap:100 VP8/90000
  
  a=fmtp:100 packetization-mode=1

  Trasncoding from VP8 to H264 is not working using library

  var sdpString = "v=0\r\no=- 0 0 IN IP4 127.0.0.1\r\ns=No Name\r\nc=IN IP4 127.0.0.1\r\nt=0 0\r\na=tool:libavformat 55.2.100\r\nm=audio 5120 TCP 111\r\na=rtpmap:111 opus/48000\r\nm=video 5122 RTP/AVP 100\r\na=rtpmap:100 VP8/90000";
  
  
  
  let sdp = stringToStream(sdpString);
  
  var inputOptions = [];
  
      inputOptions.push('-analyzeduration');
  
      inputOptions.push('300M');
  
      inputOptions.push('-probesize');
  
      inputOptions.push('300M');
  
      inputOptions.push('-protocol_whitelist');
  
      inputOptions.push('file,udp,rtp,pipe');
  
  
  
  var outputOptions = [];
  
      outputOptions.push('-c:v');
  
      outputOptions.push('libx264');
  
  
  
      outputOptions.push('-profile:v');
  
      outputOptions.push('high');
  
  
  
      outputOptions.push('-level:v');
  
      outputOptions.push('3.2');
  
  
  
      outputOptions.push('-pix_fmt');
  
      outputOptions.push('yuv420p');
  
  
  
      outputOptions.push('-x264-params');
  
      outputOptions.push('keyint=25:scenecut=0');
  
  
  
      outputOptions.push('-r');
  
      outputOptions.push('25');
  
  
  
      outputOptions.push('-c:a');
  
      outputOptions.push('aac');
  
  
  
      outputOptions.push('-ar');
  
      outputOptions.push('16k');
  
  
  
      outputOptions.push('-ac');
  
      outputOptions.push('1');
  
  
  
      outputOptions.push('-preset');
  
      outputOptions.push('ultrafast');
  
  
  
      outputOptions.push('-tune');
  
      outputOptions.push('zerolatency');
  
  
  
      outputOptions.push('-f');
  
      outputOptions.push('flv');
  
  
  
  var outputUrl = "rtmp://my-server-ip/myapp/testvp8";
  
  
  
  var command = FfmpegCommand(sdp).inputOptions(inputOptions).outputOptions(outputOptions).output(outputUrl)
  
          .on('start', function (commandLine) {
  
              console.log('Spawned Ffmpeg with command: ' + commandLine);
  
          })
  
          .on('stderr', function(stderrLine) {
  
              console.log('FFMPEG Stderr output: ' + stderrLine);
  
          });
  
  
  
      command.run();
  
  });

  Produced command using library

  ffmpeg -analyzeduration 300M -probesize 300M -protocol_whitelist file,udp,rtp,pipe -i pipe:0 -c:v libx264 -profile:v high -level:v 3.2 -pix_fmt yuv420p -x264-params keyint=25:scenecut=0 -r 25 -c:a aac -ar 16k -ac 1 -preset ultrafast -tune zerolatency -f flv rtmp://my-server-ip/myapp/testvp8

  FFmpeg logs

  FFMPEG Stderr output: ffmpeg version 3.4.4-1~16.04.york0 Copyright (c) 2000-2018 the FFmpeg developers
  
  FFMPEG Stderr output:   built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  
  FFMPEG Stderr output:   configuration: --prefix=/usr --extra-version='1~16.04.york0' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
  FFMPEG Stderr output:   libavutil      55. 78.100 / 55. 78.100
  
  FFMPEG Stderr output:   libavcodec     57.107.100 / 57.107.100
  
  FFMPEG Stderr output:   libavformat    57. 83.100 / 57. 83.100
  
  FFMPEG Stderr output:   libavdevice    57. 10.100 / 57. 10.100
  
  FFMPEG Stderr output:   libavfilter     6.107.100 /  6.107.100
  
  FFMPEG Stderr output:   libavresample   3.  7.  0 /  3.  7.  0
  
  FFMPEG Stderr output:   libswscale      4.  8.100 /  4.  8.100
  
  FFMPEG Stderr output:   libswresample   2.  9.100 /  2.  9.100
  
  FFMPEG Stderr output:   libpostproc    54.  7.100 / 54.  7.100
  
  FFMPEG Stderr output: [sdp @ 0x55c28151c180] max delay reached. need to consume packet
  
  FFMPEG Stderr output: [sdp @ 0x55c28151c180] RTP: missed 1 packets

  Observed results

  I have observed that inputted VP8 stream is not transcoded to H264 using FFmpeg library

  Expected results

  Inputted VP8 stream should be transcoded to H264 using the library.

  Please help so how can I resolve the issue.

• Trying to use decklink output from ffmpeg's libavdevice in a C++ app

  10 février 2021, par Raster

  I'm trying to add support for decklink devices in an video streaming app that my company is developing. We're using C++ and FFMpeg as a processing library. Other types of inputs and outputs are working. Adding support for decklink inputs was really easy, it just worked (at least with the device we tested it on - DeckLink SDI Quad). But for outputs... I'm fighting this for 3 days as of now with no results. I cannot find any docs for this, neither I can find any code example, how should I initialize AVFormatContext and other parts that are needed.

  


  By reading FFMpeg's decklink avdevice code, I managed to get to the point that AVFormatContext doesn't complain about incorrect data format anymore. I'm using wrapped_avframe and pcm_s16le as a codecs, I'm setting (converting) video and audio params to values accepted by device, I'm sending AVPackets with av_interleaved_write_frame, and it doesn't work. Couple of packets are being accepted, couple of libDeckLinkAPI.so threads are spawned, and it just locks - my output thread locks on some 80-ish call to av_interleaved_write_frame. And it is a deadlock, it never goes any further. Debugger shows only that it is waiting for something :

  


  #0  futex_wait_cancelable (private=<optimized out="out">, expected=0, futex_word=0x7fe34c0402c8) at ../sysdeps/nptl/futex-internal.h:183&#xA;#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x7fe34c040178, cond=0x7fe34c0402a0) at pthread_cond_wait.c:508&#xA;#2  __pthread_cond_wait (cond=0x7fe34c0402a0, mutex=0x7fe34c040178) at pthread_cond_wait.c:638&#xA;#3  0x00007fe35c69bd04 in ?? () from /lib/libDeckLinkAPI.so&#xA;#4  0x00007fe371394ac7 in ?? () from /lib/libavdevice.so.58&#xA;#5  0x00007fe370f249ad in ?? () from /lib/libavformat.so.58&#xA;#6  0x00007fe370f26615 in av_interleaved_write_frame () from /lib/libavformat.so.58&#xA;</optimized>

  


  I'm obviously doing something wrong, but I can't find what...
Can anyone point me to some documentation or (working) code example how it should be done ?

  


  Thanks in advance :)

  


• Senior Software Engineer for Enterprise Analytics Platform

  28 janvier 2016, par Matthieu Aubry — Jobs

  We’re looking for a lead developer to work on Piwik Analytics core platform software. We have some exciting challenges to solve and need you !

  You’ll be working with both fellow employees and our open-source community. Piwik PRO staff lives in New Zealand, Europe (Poland, Germany) and in the U.S. We do the vast majority of our collaboration online.

  We are a small, flexible team, so when you come aboard, you will play an integral part in engineering. As a leader you’ll help us to prioritise work and grow our community. You’ll help to create a welcoming environment for new contributors and set an example with your development practices and communications skills. You will be working closely with our CTO to build a future for Piwik.

  Key Responsibilities

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  Minimum qualifications

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  Location

  • Remote work position !
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  Learn more

  Learn more what it’s like to work on Piwik in our blog post

  About Piwik

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  About Piwik PRO company

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  As a Lead Software Developer for Piwik PRO, you will be writing open source code that will run on more than 200,000 servers and be used in 200+ countries and 50 languages !

  Apply online

  To apply for this position, please Apply online here. We look forward to receiving your applications !