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• ffmpeg can't access to usb webcam from python subprocess.Popen in windows

  29 avril 2021, par Tomez

  If I run the following ffmpeg command from windows cmd it works
  

  


  ffmpeg -f dshow -i video="USB Video Device" -s 1280x720 -f rawvideo -pix_fmt rgb24 pipe:


  


  I then tried to execute the same in python
  
Python 3.7.4 (tags/v3.7.4:e09359112e, Jul 8 2019, 20:34:20) [MSC v.1916 64 bit (AMD64)] on win32

  


  args = [
    'ffmpeg', '-f', 'dshow', '-i', 'video=USB Video Device', '-s', '1280x720',
    '-f', 'rawvideo', '-pix_fmt','rgb24', 'pipe:'
]
ffmpeg_proc = subprocess.Popen(args, stdout=subprocess.PIPE)


  


  but I get this error

  


  D:\Projects\Applications\VideoCapture\Virtualenv\Scripts\python.exe D:/Projects/Applications/VideoCapture/Sources/Application/video_capture.py "USB Video Device" 1280 720
ffmpeg version 4.4-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.0 (Rev6, 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-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Input #0, dshow, from 'video=USB Video Device':
  Duration: N/A, bitrate: N/A
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 30 fps, 30 tbr, 10000k tbn, 10000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
Press [q] to stop, [?] for help
video=USB Video Device: I/O error
Output #0, rawvideo, to 'pipe:':
  Metadata:
    encoder         : Lavf58.76.100
  Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 1280x720, q=2-31, 663552 kb/s, 30 fps, 30 tbn
    Metadata:
      encoder         : Lavc58.134.100 rawvideo
frame=    0 fps=0.0 q=0.0 Lsize=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)


  


  The inportant row is USB Video Device : I/O error
  
I've tried also to add shell=True to the Popen but with the same result.

  


  Doing some tests I found that using pycharm debug mode or simply lunching the same code inside "Pycharm Python Console" no more I/O error and all seems to work. I think something changes in the environment created for the subrocess but I wasn't able to understand what PyCharm is doing under the hood.

  


  Here the output inside PyCharm Python Console

  


  D:\Projects\Applications\VideoCapture\Virtualenv\Scripts\python.exe "C:\Program Files\JetBrains\PyCharm Community Edition 2019.1.1\plugins\python-ce\helpers\pydev\pydevconsole.py" --mode=client --port=65058
import sys; print('Python %s on %s' % (sys.version, sys.platform))
sys.path.extend(['D:\\Projects\\Applications\\VideoCapture', 'D:\\Projects\\Applications\\VideoCapture\\Sources\\Application', 'D:\\Projects\\Applications\\VideoCapture\\Sources\\Compiler', 'D:/Projects/Applications/VideoCapture'])
PyDev console: starting.
Python 3.7.4 (tags/v3.7.4:e09359112e, Jul  8 2019, 20:34:20) [MSC v.1916 64 bit (AMD64)] on win32
runfile('D:/Projects/Applications/VideoCapture/Sources/Application/video_capture.py', args=['USB Video Device', '1280', '720'], wdir='D:/Projects/Applications/VideoCapture/Sources/Application')
ffmpeg version 4.4-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.0 (Rev6, 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-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Input #0, dshow, from 'video=USB Video Device':
  Duration: N/A, start: 111984.462000, bitrate: N/A
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 30 fps, 30 tbr, 10000k tbn, 10000k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
Press [q] to stop, [?] for help
Output #0, rawvideo, to 'pipe:':
  Metadata:
    encoder         : Lavf58.76.100
  Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24(pc, progressive), 1280x720, q=2-31, 663552 kb/s, 30 fps, 30 tbn
    Metadata:
      encoder         : Lavc58.134.100 rawvideo
av_interleaved_write_frame(): Invalid argument
    Last message repeated 1 times
Error writing trailer of pipe:: Invalid argument
frame=  118 fps= 30 q=-0.0 Lsize=  313200kB time=00:00:03.93 bitrate=652306.1kbits/s dup=53 drop=0 speed=   1x


  


  Does anyone now how to fix this problem or have any knowledge on how PyCharm Python Console works ?

  


• New proposed ePrivacy Regulation and why Piwik might not need tracking consent compared to Google Analytics & co

  11 janvier 2017, par InnoCraft — Community

  The EU is proposing new ePrivacy Regulations. The proposed Regulation on Privacy and Electronic Communications will increase the protection of people’s private life and open up new opportunities for business.

  

  The new ePrivacy Regulation proposal

  The proposal mentions several changes for example to the “Cookie Law” where no longer a cookie consent will be needed when the cookies improve the user’s internet experience, for example to remember the shopping cart history or when completing a form over several pages.

  However, consent to track a user’s behaviour may be needed in the future, unless the analytics data collection is hosted on the first-party website.

  From TheRegister : O’Neil noted a minor change in which visitors to a website for analytics purposes do not require consent, as long as any personal data collected is only processed by the first party.

  

  First party Analytics respecting privacy

  Piwik is an open-source analytics platform that is used on more than 1 million websites and apps in over 150 countries, and available in more than 50 languages. The difference with other analytics solutions is that you can download and install Piwik on your own infrastructure. Websites and mobile apps tracking users with their own Piwik very likely won’t require a consent from their users if these regulations become reality.

  We have regularly written about why privacy matters, or more recently 11 ways Piwik Analytics helps you to protect your visitors privacy.

  Besides the standard Piwik features, there are Premium Features that let businesses and organizations further maximize their success based on the tracked data. Need help in hosting Piwik on premise ? InnoCraft are THE Piwik experts and know it best as it is the company of the makers of Piwik. InnoCraft provides support subscriptions and enterprise packages to help you setting up, configuring and maintaining Piwik on your infrastructure as well as offer training and custom development.

  

  We’re excited to be building the best digital analytics platform which respects our privacy on the Internet.

  Thank you for being a valued member of the Piwik community !

• Google speech to text api is partially converting .flac file into text

  12 juillet 2018, par Gemini Jain

  Steps followed :

  1. Converted .mp3 to .flac using ffmpeg.
  2. Ran this command
     gs://xxx/xxx.flac --language-code=en-US --async --encoding=FLAC --sample-rate=44100.
  3. After processing it, is showing result in JSON format, but its not relevant to audio file.

  JSON result looks like :

  {
  
    "@type": "xxx",
  
    "results": [
  
      {
  
        "alternatives": [
  
          {
  
            "confidence": 0.71890223,
  
            "transcript": "I reports everybody."
  
          }
  
        ]
  
      },
  
      {
  
        "alternatives": [
  
          {
  
            "confidence": 0.5876879,
  
            "transcript": "dear, it's your"
  
          }
  
        ]
  
      }
  
  ......
  
  }]}

  Can please someone help me in figuring out why it is not converting the audio files correctly ? Am I missing any tags ?.