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• how to use x264 dll in another project

  7 février 2024, par Hadi Rasekh

  I want to use x264 in my project. There is some line in the code said :

  


  `/* Application developers planning to link against a shared library version of

  


  

  • libx264 from a Microsoft Visual Studio or similar development environment

  


  • will need to define X264_API_IMPORTS before including this header.

  


  • This clause does not apply to MinGW, similar development environments, or non

  


  • Windows platforms. */`

  


  


  But I don't get this line :
define X264_API_IMPORTS before including this header

  


  We can create x264 dll by its configuration and make

  


      ./configure --enable-shared
    make


  


  but I can not use the dll in my Qt Project.

  


  I can make my own dll (in another code) and use it in the project.
But when I start to use x264 dll in my project I get the following error :

  


      C:\DataHiding\SourceCode2\GUI\DataHiding\mainwindow.cpp:10: error:
    'pulldown_frame_duration' was not declared in this scope
    qDebug() << pulldown_frame_duration[1];
             ^


  


• how to use x264 dll in another project

  7 février 2024, par Hadi Rasekh

  I want to use x264 in my project. There is some line in the code said :

  


  `/* Application developers planning to link against a shared library version of

  


  

  • libx264 from a Microsoft Visual Studio or similar development environment

  


  • will need to define X264_API_IMPORTS before including this header.

  


  • This clause does not apply to MinGW, similar development environments, or non

  


  • Windows platforms. */`

  


  


  But I don't get this line :
define X264_API_IMPORTS before including this header

  


  We can create x264 dll by its configuration and make

  


      ./configure --enable-shared
    make


  


  but I can not use the dll in my Qt Project.

  


  I can make my own dll (in another code) and use it in the project.
But when I start to use x264 dll in my project I get the following error :

  


      C:\DataHiding\SourceCode2\GUI\DataHiding\mainwindow.cpp:10: error:
    'pulldown_frame_duration' was not declared in this scope
    qDebug() << pulldown_frame_duration[1];
             ^


  


• How to get full name of default microphone ?

  9 août 2019, par Jiapeng Li

  Been trying to get full name of microphone as a variable on Python for usage of ffmpeg. I have already tried

  p = pyaudio.PyAudio()
  
  default_device = p.get_default_input_device_info()
  
  print(default_device['name'])

  and here was the output :

  Microphone (Conexant SmartAudio         #it was truncated to 31 characters length

  Obviously,that was truncated and not what i wanted.
  Tried sounddevice too :

  import sounddevice as sd
  
  s = sd.query_devices()
  
  print(s)

  Output :

     0 Microsoft Sound Mapper - Input, MME (2 in, 0 out)
  
  >  1 Microphone (Conexant SmartAudio, MME (2 in, 0 out)           #still truncated
  
     2 Microsoft Sound Mapper - Output, MME (0 in, 2 out)
  
  <  3 Speakers (Conexant SmartAudio H, MME (0 in, 2 out)
  
     4 Primary Sound Capture Driver, Windows DirectSound (2 in, 0 out)
  
     5 Microphone (Conexant SmartAudio HD), Windows DirectSound (2 in, 0 out)    #now got normal,but why?
  
     6 Primary Sound Driver, Windows DirectSound (0 in, 2 out)
  
     7 Speakers (Conexant SmartAudio HD), Windows DirectSound (0 in, 2 out)
  
     8 Speakers (Conexant SmartAudio HD), Windows WASAPI (0 in, 2 out)
  
     9 Microphone (Conexant SmartAudio HD), Windows WASAPI (2 in, 0 out)
  
    10 Stereo Mix (Conexant HD Stereo Mix), Windows WDM-KS (2 in, 0 out)
  
    11 Microphone (Conexant HD Audio capture), Windows WDM-KS (2 in, 0 out)
  
    12 Speakers (Conexant HD Audio output), Windows WDM-KS (0 in, 2 out)

  It can be seen that device number 1 was my default one and if that was full name it would be perfect but unfortunately that was not.

  Then the only thing i could have thought of was to capture full name from list that ffmpeg provided :

  'ffmpeg -list_devices true -f dshow -i dummy':
  
  [dshow @ 000001cc4f298d00] DirectShow video devices (some may be both video and audio devices)
  
  [dshow @ 000001cc4f298d00]  "USB2.0 VGA UVC WebCam"
  
  [dshow @ 000001cc4f298d00]     Alternative name "@device_pnp_\\?\usb#vid_13d3&pid_5a07&mi_00#6&2f27e633&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"
  
  [dshow @ 000001cc4f298d00]  "screen-capture-recorder"
  
  [dshow @ 000001cc4f298d00]     Alternative name "@device_sw_{860BB310-5D01-11D0-BD3B-00A0C911CE86}\{4EA69364-2C8A-4AE6-A561-56E4B5044439}"
  
  [dshow @ 000001cc4f298d00] DirectShow audio devices
  
  [dshow @ 000001cc4f298d00]  "Microphone (Conexant SmartAudio HD)"
  
  [dshow @ 000001cc4f298d00]     Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{AFE404CD-A721-49BE-8AC5-669DA725185F}"
  
  [dshow @ 000001cc4f298d00]  "virtual-audio-capturer"
  
  [dshow @ 000001cc4f298d00]     Alternative name "@device_sw_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\{8E146464-DB61-4309-AFA1-3578E927E935}"

  I used

  popen = subprocess.Popen('ffmpeg -list_devices true -f dshow -i dummy', stdout=subprocess.PIPE)
  
  popen.wait()
  
  
  
  lines = popen.stdout.readlines()
  
  print(lines)

  After that i got totally confused because the output was an empty list. Now i am lost in desert and know nowhere to go. Really appreciate it if you could help.