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• Open cv.VideoCapture(index) - ffmpeg list camera names - How to match ?

  15 novembre 2024, par Chris P

      def fetch_camera_input_settings(self):
        try:
            self.database_functions = database_functions

            self.camera_input_device_name = database_functions.read_setting("camera_input_device_name")["value"]
            self.camera_input_device_number = int(self.database_functions.read_setting("camera_input_device_number")["value"])

            self.camera_input_devices = [[0,-1,"Καμία συσκευή κάμερας"]]
            self.available_cameras = [{"device_index":-1,"device_name":"Καμία συσκευή κάμερας"}]

            # FFmpeg command to list video capture devices on Windows
            cmd = ["ffmpeg", "-list_devices", "true", "-f", "dshow", "-i", "dummy"]
            result = subprocess.run(cmd, stderr=subprocess.PIPE, stdout=subprocess.PIPE, text=True)
            output = result.stderr  # FFmpeg sends device listing to stderr

            # Updated regular expression to capture both video and audio devices
            device_pattern = re.compile(r'\[dshow @ .+?\] "(.*?)" \(video\)')
            cameras = device_pattern.findall(output)
            counter = 0
            for camera in cameras:
                counter += 1
                self.camera_input_devices.append([counter,counter-1,camera])
                self.available_cameras.append({"device_index": counter-1, "device_name": camera})

            self.to_emitter.send({"type":"available_devices","devices":self.camera_input_devices,"device_index":self.camera_input_device_number})
        except:
            error_message = traceback.format_exc()
            self.to_emitter.send({"type":"error","error_message":error_message})



  


  How to match ffmpeg camera device names output with cv2.VideoCapture which wants camera index as input ?

  


• How can i list all the audio devices on my pc using ffmpeg ? [closed]

  12 octobre 2024, par Daniel Lip

  I'm using ffmpeg version : 2024-07-10

  


  I tried this cmd command after running the cmd as admin.

  


  ffmpeg -list_devices true -f dshow -i dummy


  


  but the result is :

  


  D:\>ffmpeg -list_devices true -f dshow -i dummy
ffmpeg version 2024-07-10-git-1a86a7a48d-essentials_build-www.gyan.dev Copyright (c) 2000-2024 the FFmpeg developers
  built with gcc 13.2.0 (Rev5, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      59. 28.100 / 59. 28.100
  libavcodec     61. 10.100 / 61. 10.100
  libavformat    61.  5.101 / 61.  5.101
  libavdevice    61.  2.100 / 61.  2.100
  libavfilter    10.  2.102 / 10.  2.102
  libswscale      8.  2.100 /  8.  2.100
  libswresample   5.  2.100 /  5.  2.100
  libpostproc    58.  2.100 / 58.  2.100
[dshow @ 000001c1e700f200] Could not enumerate video devices (or none found).
[dshow @ 000001c1e700f200] Could not enumerate audio only devices (or none found).
[in#0 @ 000001c1e700ee00] Error opening input: Immediate exit requested
Error opening input file dummy.


  


• How to parse ffmpeg -list_options output to get complete list of formats ?

  9 octobre 2024, par gaamaa

  On my Windows 10, application I use VB6 and ffmpeg.exe to capture video from USB capture device.
I need to show complete list of supported formats by this capture card.

  


  When I use below command I get some list.
But its looks incomplete for me.

  


  
    ffmpeg -f dshow -list_options true -i video="USB3. 0 capture"



  


  Result :

  


  USB3. 0 capture:
 Q:\FFMpeg VB6\f2>ffmpeg -f dshow -list_options true -i video="USB3. 0 capture"
[dshow @ 087d7480] DirectShow video device options (from video devices)
[dshow @ 087d7480]  Pin "Capture" (alternative pin name "0")
vcodec=mjpeg  min s=1920x1080 fps=10 max s=1920x1080 fps=60.0002
vcodec=mjpeg  min s=1920x1080 fps=10 max s=1920x1080 fps=60.0002
vcodec=mjpeg  min s=1600x1200 fps=10 max s=1600x1200 fps=60.0002
vcodec=mjpeg  min s=1600x1200 fps=10 max s=1600x1200 fps=60.0002
vcodec=mjpeg  min s=1360x768 fps=10 max s=1360x768 fps=60.0002
vcodec=mjpeg  min s=1360x768 fps=10 max s=1360x768 fps=60.0002
vcodec=mjpeg  min s=1280x1024 fps=10 max s=1280x1024 fps=60.0002
vcodec=mjpeg  min s=1280x1024 fps=10 max s=1280x1024 fps=60.0002
vcodec=mjpeg  min s=1280x960 fps=10 max s=1280x960 fps=60.0002
vcodec=mjpeg  min s=1280x960 fps=10 max s=1280x960 fps=60.0002
vcodec=mjpeg  min s=1280x720 fps=10 max s=1280x720 fps=60.0002
vcodec=mjpeg  min s=1280x720 fps=10 max s=1280x720 fps=60.0002
vcodec=mjpeg  min s=1024x768 fps=10 max s=1024x768 fps=60.0002
vcodec=mjpeg  min s=1024x768 fps=10 max s=1024x768 fps=60.0002
vcodec=mjpeg  min s=800x600 fps=10 max s=800x600 fps=60.0002
vcodec=mjpeg  min s=800x600 fps=10 max s=800x600 fps=60.0002
vcodec=mjpeg  min s=720x576 fps=10 max s=720x576 fps=60.0002
vcodec=mjpeg  min s=720x576 fps=10 max s=720x576 fps=60.0002
vcodec=mjpeg  min s=720x480 fps=10 max s=720x480 fps=60.0002
vcodec=mjpeg  min s=720x480 fps=10 max s=720x480 fps=60.0002
vcodec=mjpeg  min s=640x480 fps=10 max s=640x480 fps=60.0002
vcodec=mjpeg  min s=640x480 fps=10 max s=640x480 fps=60.0002
pixel_format=yuyv422  min s=1280x720 fps=10 max s=1280x720 fps=10
pixel_format=yuyv422  min s=1280x720 fps=10 max s=1280x720 fps=10
pixel_format=yuyv422  min s=1920x1080 fps=5 max s=1920x1080 fps=5
pixel_format=yuyv422  min s=1920x1080 fps=5 max s=1920x1080 fps=5
pixel_format=yuyv422  min s=1600x1200 fps=5 max s=1600x1200 fps=5
pixel_format=yuyv422  min s=1600x1200 fps=5 max s=1600x1200 fps=5
pixel_format=yuyv422  min s=1360x768 fps=8 max s=1360x768 fps=8
pixel_format=yuyv422  min s=1360x768 fps=8 max s=1360x768 fps=8
pixel_format=yuyv422  min s=1280x1024 fps=8 max s=1280x1024 fps=8
pixel_format=yuyv422  min s=1280x1024 fps=8 max s=1280x1024 fps=8
pixel_format=yuyv422  min s=1280x960 fps=8 max s=1280x960 fps=8
pixel_format=yuyv422  min s=1280x960 fps=8 max s=1280x960 fps= 8
pixel_format=yuyv422  min s=1024x768 fps=10 max s=1024x768 fps=10
pixel_format=yuyv422  min s=1024x768 fps=10 max s=1024x768 fps=10
pixel_format=yuyv422  min s=800x600 fps=5 max s=800x600 fps=20
pixel_format=yuyv422  min s=800x600 fps=5 max s=800x600 fps=20
pixel_format=yuyv422  min s=720x576 fps=5 max s=720x576 fps=25
pixel_format=yuyv422  min s=720x576 fps=5 max s=720x576 fps=25
pixel_format=yuyv422  min s=720x480 fps=5 max s=720x480 fps=30
pixel_format=yuyv422  min s=720x480 fps=5 max s=720x480 fps=30
pixel_format=yuyv422  min s=640x480 fps=5 max s=640x480 fps=30
pixel_format=yuyv422  min s=640x480 fps=5 max s=640x480 fps=30


  


  My question is :

  


  How to get the proper list in-between min and max ?

  


  Eg :
Please see the below 4 lines.

  


   vcodec=mjpeg  min s=1920x1080 fps=10 max s=1920x1080 fps=60.0002
 vcodec=mjpeg  min s=1920x1080 fps=10 max s=1920x1080 fps=60.0002
 vcodec=mjpeg  min s=1600x1200 fps=10 max s=1600x1200 fps=60.0002
 vcodec=mjpeg  min s=1600x1200 fps=10 max s=1600x1200 fps=60.0002


  


  It says
min fps=10
max fps=60.0002

  


  Actually it supports below fps :

  


  fps=10.00,
fps=20.00,
fps=25.00,
fps=30.00,
fps=50.00,
fps=60.00


  


  How to guess and get the hidden list like : 20, 25, 30 and 50 ?
If I blindly make a list from guessed values,
Some format doesn't have fps=25 on the list and ffmpeg throw error !

  


  Note :
I can not use C++ or .NET to dig further.
Please suggest me some trick to get the proper list from ffmpeg commands only.
Or any universal guess !