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• avcodec/v4l2_m2m_dec : fix dropped packets while decoding

  30 août 2019, par Maxime Jourdan

  avcodec/v4l2_m2m_dec : fix dropped packets while decoding
  * FFmpeg retrieves a packet from the bitstream
  
  * It attempts to get an input buffer (from its own list or by dequeuing one from the driver)
  
  * If no input buffer is found, the bitstream packet is dropped instead of scheduled for trying again later
  It's an issue that showed especially at high speeds (like using `-f null -` as output parameters).
  Signed-off-by : Aman Gupta <aman@tmm1.net>
  

  • [DH] libavcodec/v4l2_m2m.h
  • [DH] libavcodec/v4l2_m2m_dec.c

• libavcodec/amfenc : Vulkan initialization support for encoder.

  8 août 2019, par OvchinnikovDmitrii

  libavcodec/amfenc : Vulkan initialization support for encoder.
  Added linux support for amf encoder through vulkan.
  To use h.264(AMD VCE) encoder on linux amdgru-pro version 19.20+ and
  
  amf-amdgpu-pro package(amdgru-pro contains, but does not install
  
  automatically) are required.
  This driver can be installed using amdgpu-pro-install script in
  
  official amd driver archive.
  Initialization of amf encoder occurs in this order :
  
  1) trying to initialize through dx11(only windows)
  
  2) trying to initialize through dx9(only windows)
  
  3) trying to initialize through vulkan
  Only Vulkan initialization available on linux.
  

  • [DH] Changelog
  • [DH] doc/general.texi
  • [DH] libavcodec/amfenc.c
  • [DH] libavcodec/version.h

• FFMPEG - Pipe PCM to STDOUT in real-time for Node.js

  20 août 2019, par bloom.510

  I am able to stream realtime PCM data from my system’s loopback driver that I can either encode raw or in WAV format using FFMPEG.

  How can I pipe the PCM to stdout as its being recorded in real-time ?

  I’m batting around in the dark here. So far I’ve tried logging stdout in Node.js, as well as creating a named pipe and listening for changes to it. None of these has returned any output.

  The basic shell command captures the audio :

  ffmpeg -f alsa -i loopout -f s16le -acodec pcm_s16le out.raw

  Using child_process.spawn() in Node.js :

  let ffmpeg = spawn('ffmpeg', [
  
      '-f', 'alsa', '-ac', '2', '-ar', '44100', '-i',
  
      'loopout', '-f', 's16le', '-acodec', 'pcm_s16le', 'out.raw',
  
  ]);

  However :

  // this never logs anything
  
  ffmpeg.stdout.on('data', (data) => {
  
      console.log(data.toString());
  
  });
  
  
  
  // this outputs what you would see in the terminal window
  
  ffmpeg.stderr.on('data', (data) => {
  
      console.log(data.toString());
  
  });

  Is there a way to access a readable stream of this file as its being created ?

  Or perhaps there is a way to stream the PCM to an RTP server and forward it as a buffer over UDP to an Express server ?

  Whatever the methodology is, the ultimate goal is to access it as a stream in Node.js and convert it into an ArrayBuffer.