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• lavc/vaapi_encode_h265 : Add GPB frame support for hevc_vaapi

  17 mars 2022, par Linjie Fu

  lavc/vaapi_encode_h265 : Add GPB frame support for hevc_vaapi
  Use GPB frames to replace regular P/B frames if backend driver does not
  
  support it.
   GPB :
  
      Generalized P and B picture. Regular P/B frames replaced by B
  
      frames with previous-predict only, L0 == L1. Normal B frames
  
      still have 2 different ref_lists and allow bi-prediction
  Signed-off-by : Linjie Fu <linjie.fu@intel.com>
  
  Signed-off-by : Fei Wang <fei.w.wang@intel.com>
  

  • [DH] libavcodec/vaapi_encode.c
  • [DH] libavcodec/vaapi_encode.h
  • [DH] libavcodec/vaapi_encode_h265.c

• FFmpeg compiling error(libavfilter/vf_scale_cuda.cu)

  11 août 2021, par Amir Mousavi

  installed packages :

  


  


  libx264 - cuda11.2 - cuda-toolkit - nvidia-driver-465

  


  


  command :

  


  ./configure —enable-nonfree —enable-cuvid —enable-nvenc —enable-cuda-nvcc —enable-libx264 —enable-gpl —extra-cflags=-I/usr/local/cuda/include —extra-ldflags=-L/usr/local/cuda/lib64

  


  here is latest lines errors :

  


  


  libavfilter/vf_scale_cuda.cu(1123) : error : a template argument may not reference a non-external entity

  


  libavfilter/vf_scale_cuda.cu(1123) : error : a template argument may not reference a non-external entity

  


  libavfilter/vf_scale_cuda.cu(1124) : error : a template argument may not reference a non-external entity

  


  libavfilter/vf_scale_cuda.cu(1124) : error : a template argument may not reference a non-external entity

  


  libavfilter/vf_scale_cuda.cu(1124) : error : a template argument may not reference a non-external entity

  


  libavfilter/vf_scale_cuda.cu(1124) : error : a template argument may not reference a non-external entity

  


  Error limit reached.
100 errors detected in the compilation of >"/tmp/tmpxft_000032a1_00000000-7_vf_scale_cuda.cpp1.ii".
Compilation terminated.
ffbuild/common.mak:108 : recipe for target >'libavfilter/vf_scale_cuda.ptx' failed
make : *** [libavfilter/vf_scale_cuda.ptx] Error 4
make : *** Waiting for unfinished jobs....

  


  


  I don't know where is the problem.

  


  lines that error referenced :

  


  EAREST_KERNELS(yuv420p)
NEAREST_KERNELS(nv12)
NEAREST_KERNELS(yuv444p)
NEAREST_KERNELS(p010le)
NEAREST_KERNELS(p016le)
NEAREST_KERNELS(yuv444p16le)


  


• Send tcp audio stream to a virtual audio device ?

  2 juillet 2021, par iegrm

  I'm making project to use my Android phone's mic as a recording device on my PC

  


  I can get the audio data of the phone's mic via a tcp localhost connection which routes through usb.

  


  With the following command to VLC, I can playback this audio through the default playback device :

  


  vlc -Idummy --demux rawaud --network-caching=50 tcp://localhost:28200


  


  But how to instead send this audio to a virtual audio device so that I can emulate it as a mic device ?

  


  I have experimented with this project in the past for creating a loopback driver for recording desktop audio using ffmpeg like so :

  


  ffmpeg -f dshow -i audio="CustomLoopbackDevice" out.mp3


  


  ..which I assume would be somewhat similar for creating a virtual audio device. I'll be checking this opensource project for making a virtual audio device but not concerned about it just yet, for now I'm using a trial version of virtual audio cable for testing.

  


  My only real issue at the moment is I'm not sure how to send the recorded audio from the tcp input stream to a virtual audio device.

  


  I'm assuming I could use either ffmpeg/vlc to send that tcp stream to the virtual audio device ? But I'm not sure what the command args for it would be.

  


  I'm using C# to manage the recording and I found this snippet of code for writing from a file to what I assume is a specific device by ID :

  


  WaveStream waveStream = new WaveFileReader("file.wav");
WaveOut waveOut = new WaveOut();
waveOut.DeviceNumber = 0;
WaveOut.Init(waveStream);
WaveOut.Play();


  


  But I'm not sure if this would support reading from the tcp stream instead of from file and how to retrieve device number of virtual device.