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• Your guide to cookies, web analytics, and GDPR compliance

  25 février 2020, par Joselyn Khor — Analytics Tips, Privacy, Security
  It’s been almost two years since the GDPR came into effect and turned the online world on its head. Confusion around cookies/cookie consent/cookie compliance remains till today. So we’d like to take this chance to talk more about the supposed “big bad” of the latest century. 

  Online cookies seem to have a bad reputation, but are they as bad as they seem ?

  To start, what are cookies on the internet ?

  An internet cookie a.k.a. an HTTP cookie, is a small piece of data sent from websites that is stored on your computer or mobile when you visit that site.

  Are all cookies bad ?

  No. Cookies themselves are usually harmless as they can’t infect computers with malware. 

  They can also be helpful for both websites who use them and individuals visiting those websites. For example, when online shopping, cookies on ecommerce sites keep track of what you’re shopping for. If you didn’t have that tracking, your cart would be empty every time you moved away from that site.

  For businesses/websites, cookies can be used for authentication (logins) and tracking website user experience. For example, tracking multiple visits to the same site in order to provide better experiences to customers visiting their website.

  

  The not-so-sweet types of cookies :

  Cookies that contain personal data

  Another example of a bad cookie is when cookies contain personal data directly in the cookie itself. For example, when websites store demographics or your name in a cookie ; or when a website stores survey results in a cookie. Use of cookies in these ways is considered bad practice nowadays.

  Third-party cookies
  

  They can be used by websites to learn about your visit and activity across multiple websites. Cookies can enter harmful territory when employed for “big brother” types of tracking i.e. when they’re used to build a virtual fingerprint of individuals after their activity is tracked from website to website. For example most advertising networks create third party cookies in your browser when you view an ad, which lets these advertisers track users across these websites and let companies buy more targeted ads.

  Why does Matomo use cookies ?

  

  For accurate reporting of new and returning visitors. Matomo uses cookies to store some information about visitors between visits. We also use cookies to remember if someone gave consent to tracking, or opted out of tracking. 

  Types of cookies Matomo uses :

  • Matomo by default uses first-party cookies, set on the domain of your site.
  • Cookies created by Matomo start with : _pk_ref, _pk_cvar, _pk_id, _pk_ses. See a list of all Matomo cookies : https://matomo.org/faq/general/faq_146/

  Cookie-less tracking - disable cookies and ensure cookie compliance :

  It’s possible to disable tracking cookies in Matomo by adding a line on the javascript code. When cookies are disabled, Matomo data will become slightly less accurate. Also, when cookies are disabled, there may still be a few cookies created in specific cases.

  If you disable cookies, Matomo tries to detect unique visitors by a fingerprint based on a few browser attributes : operating system, browser, browser plugins, IP address and browser language.

  By disabling tracking cookies, you may also use Matomo without needing to display a cookie consent screen. You can also keep tracking when they reject cookie consent by keeping cookies disabled.

  Cookies and the GDPR

  In some countries and according to the GDPR, websites need to provide a way for users to opt-out of all tracking, in particular tracking cookies.

  The GDPR regulates the use of cookies when they compromise an individual’s privacy. When cookies can identify an individual, it is considered personal data.

  

  Cookie compliance and the GDPR

  To be GDPR compliant you must :

  • Receive user consent before using any cookies (except strictly necessary cookies). Read more on cookies that are “clearly exempt from consent”.
  • Provide accurate and specific information about the data each cookie tracks and its purpose in plain language before consent is received.
  • Document and store consent received from users.
  • Allow users to access your service even if they refuse to allow the use of certain cookies
  • Make it as easy for users to withdraw their consent as it was for them to give their consent in the first place.

  Source : https://gdpr.eu/cookies/

  When does GDPR require cookie consent ?

  The purpose of the GDPR is to give individuals control over their personal data. As such this regulation has provisions and requirements which regulate the processing of personal data to protect the privacy of individuals. 

  This means in order to use cookies, you will sometimes need explicit consent from those individuals.

  When does GDPR not require cookie consent ?

  Then there are many cookies that generally do NOT require consent (Source : https://wikis.ec.europa.eu/display/WEBGUIDE/04.+Cookies). 

  These are :

  • user input cookies, for the duration of a session
  • authentication cookies, for the duration of a session
  • user-centric security cookies, used to detect authentication abuses and linked to the functionality explicitly requested by the user, for a limited persistent duration
  • multimedia content player session cookies, such as flash player cookies, for the duration of a session
  • load balancing session cookies and other technical cookies, for the duration of session
  • user interface customisation cookies, for a browser session or a few hours, when additional information in a prominent location is provided (e.g. “uses cookies” written next to the customisation feature)

  Tracking cookies and consent vs legitimate interest

  

  User consent is not always required :

  We understand that whenever you collect and process personal data, you need – almost always – to ask for their consent. However, there are instances where you have to process data under “legitimate interests”. The GDPR states that processing of personal data is lawful “if processing is necessary for the purposes of the legitimate interests”. This means if you have “legitimate interests” you can avoid asking for consent for collecting and processing personal information. Learn more : https://cookieinformation.com/resources/blog/what-is-legitimate-interest-under-the-gdpr 

  A lawful basis for processing personal data (proceeding with caution) :

  We’ve also written about having a lawful basis for processing personal data under GDPR with Matomo. The caveat here is you need to have a strong argument for legitimate interests. If you are processing personal data which may represent a risk to the final user, then getting consent is, for us, still the right lawful basis. If you are not sure, at the time of writing ICO is providing a tool in order to help you make this decision.

  How is Matomo Analytics GDPR compliant ?

  Matomo can be configured to automatically anonymise data so you don’t process any personal data. This allows you to completely avoid GDPR. If you decide to process personal data, Matomo provides you with 12 steps to easily comply with the GDPR guidelines.

  New developments on cookies and the GDPR

  In the early days of the GDPR, a spate of cookie management platforms (CMPs) popped up to help websites and people comply with GDPR rules around cookies.

  These have become problematic in recent years. Europe’s highest court ruled pre-checked box for cookie boxes does not give enough consent. 

  As well as that, new research suggests most cookie consent pop-ups in the EU fall short of GDPR. A new study called, ‘Dark Patterns after the GDPR’ from MIT, UCL and Aarhus University found that a vast majority of websites aren’t following GDPR rules around cookies. The study found most cookie consent pop-ups in the EU to be undermining the GDPR by finding sneaky ways to convince website visitors to click ‘accept’.

  Disclaimer

  We are not lawyers and don’t claim to be. The information provided here is to help give an introduction to issues you may encounter when dealing cookies. We encourage every business and website to take data privacy seriously and discuss these issues with your lawyer if you have any concerns. 

  Additional resources :

  • How do the cookie rules relate to the GDPR ? 
  • Cookies, the GDPR, and the ePrivacy Directive

• FFMPEG - Why can't i record a video for more than 10 seconds ?

  12 février 2020, par gabriel

  I’m developing a screen recorder for windows with python but for some reason i can’t record the video for more than 10 seconds.However i can record the audio for more than 10 seconds.
  Also i’m using :

  FFMPEG - to record the video with mp4 extension

  PYAUDIO - to record the sound

  TKINTER - to design the GUI

  Since the problem is with the video recording i will leave the code that i used with ffmpeg :

  """
  
  cmdGen.py generates ffmpeg commands to record your screen
  
  
  
  """
  
  import os
  
  
  
  class cmdGen:
  
      def __init__(self):
  
          self.fps = 60
  
          self.source = "desktop"
  
          self.encoder = 'mpeg4'
  
          self.hwaccel = None
  
          self.drawMouse = 1
  
          self.enableWebcam = False
  
          self.audList = 0
  
      def config(self,
  
                  fps=None,source=None,encoder=None,
  
                  hwaccel='unchanged',drawMouse=None,
  
                  webcam=None,audList=None):
  
          if fps: self.fps = fps
  
          if source: self.source = source
  
          if encoder: self.encoder = encoder
  
          if hwaccel != 'unchanged': self.hwaccel = hwaccel
  
          if drawMouse: self.drawMouse = 0 if not self.drawMouse else 1
  
          if webcam: self.enableWebcam = bool(webcam)
  
          if audList: self.audList = audList
  
      def setSource(self,isWindow,windowName=""):
  
          if not isWindow:
  
              self.source = "desktop"
  
          else:
  
              self.source = "title="+windowName
  
      def setFps(self,fps):
  
          self.fps = fps
  
      def setEncode(self,encoder):
  
          self.encoder = encoder
  
      def getCmd(self,filename):
  
          print("ACK")
  
          finalCmd = ["ffmpeg.exe","-f","gdigrab"]
  
          finalCmd.extend(['-i',self.source])
  
          finalCmd.extend(['-framerate',str(self.fps)])
  
          finalCmd.extend(['-c:v',self.encoder])
  
          if self.encoder == 'mpeg4':
  
              finalCmd.extend(['-q:v','7'])
  
          if self.hwaccel: 
  
              finalCmd.extend(['-hwaccel',self.hwaccel])
  
          finalCmd.extend(['-draw_mouse',str(self.drawMouse)])
  
          finalCmd.extend(["-y", filename])
  
          print(finalCmd)
  
          return finalCmd
  
      def getCvtCmd(self,filename):
  
              # if self.rcchecked.get():
  
              #     self.mergeProcess = subprocess.Popen(args= ["ffmpeg","-i",'tmp/tmp.mkv','-i','tmp/tmp.wav','-i','tmp/webcamtmp.mkv','-filter_complex','[2:v] scale=640:-1 [inner]; [0:0][inner] overlay=0:0 [out]',"-shortest",'-map','[out]','-y',"ScreenCaptures/"+self.filename])
  
              # else:
  
              #     self.mergeProcess = subprocess.Popen(args= ["ffmpeg","-i",'tmp/tmp.mkv','-i','tmp/tmp.wav',"-shortest",'-y',"ScreenCaptures/"+self.filename], startupinfo=startupinfo)
  
          print("ACK")
  
          finalCmd = ["ffmpeg.exe"]
  
          finalCmd.extend(['-i','tmp/tmp.mkv'])
  
          for i in range(len(self.audList)):
  
              finalCmd.extend(['-i','tmp/tmp_'+str(i)+'.wav'])
  
          if len(self.audList) > 0:
  
              finalCmd.extend(['-filter_complex','amerge=inputs='+str(len(self.audList)),'-ac',str(len(self.audList))])
  
          # finalCmd.extend(['-c:v',self.encoder])
  
          if self.enableWebcam:
  
              finalCmd.extend(['-i','tmp/webcamtmp.mkv','-filter_complex','[2:v] scale=640:-1 [inner]; [0:0][inner] '
  
                                                                          'overlay=0:0 [out]','-map','[out]'])
  
  
  
          #finalCmd.extend(['-shortest'])
  
          finalCmd.extend(["-y", filename])
  
          print(finalCmd)
  
          return finalCmd
  
  
  
  if __name__ == "__main__":
  
      cg = cmdGen()
  
      cg.setEncode("h264_nvenc")
  
      cg.setFps(60)
  
      cg.setSource(False)
  
      print(cg.getCmd("tmp"))

  Thanks guys

  Full log trying to record 1 minute :

  C:\Users\FabianoFreitas\AppData\Local\Programs\Python\Python37\python.exe C:/Users/FabianoFreitas/Desktop/PowerShare-v2.0/screenRecorder.py
  
  ACK
  
  ['ffmpeg.exe', '-f', 'gdigrab', '-i', 'desktop', '-framerate', '60', '-c:v', 'mpeg4', '-q:v', '7', '-draw_mouse', '1', '-y', 'tmp/tmp.mkv']
  
  * recording
  
  ACK
  
  ['ffmpeg.exe', '-i', 'tmp/tmp.mkv', '-i', 'tmp/tmp_0.wav', '-filter_complex', 'amerge=inputs=1', '-ac', '1', '-y', 'Videos/ScreenCapture24.mp4']
  
  * done recording
  
  ffmpeg version git-2020-02-05-e6891d1 Copyright (c) 2000-2020 the FFmpeg developers
  
    built with gcc 9.2.1 (GCC) 20200122
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  
    libavutil      56. 39.100 / 56. 39.100
  
    libavcodec     58. 67.101 / 58. 67.101
  
    libavformat    58. 37.100 / 58. 37.100
  
    libavdevice    58.  9.103 / 58.  9.103
  
    libavfilter     7. 74.100 /  7. 74.100
  
    libswscale      5.  6.100 /  5.  6.100
  
    libswresample   3.  6.100 /  3.  6.100
  
    libpostproc    55.  6.100 / 55.  6.100
  
  Input #0, matroska,webm, from 'tmp/tmp.mkv':
  
    Metadata:
  
      ENCODER         : Lavf58.37.100
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: mpeg4 (Simple Profile), yuv420p, 2560x1080 [SAR 1:1 DAR 64:27], 29.97 fps, 29.97 tbr, 1k tbn, 30k tbc (default)
  
      Metadata:
  
        ENCODER         : Lavc58.67.101 mpeg4
  
  Guessed Channel Layout for Input Stream #1.0 : stereo
  
  Input #1, wav, from 'tmp/tmp_0.wav':
  
    Duration: 00:01:09.08, bitrate: 1411 kb/s
  
      Stream #1:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
  
  Stream mapping:
  
    Stream #1:0 (pcm_s16le) -> amerge (graph 0)
  
    amerge (graph 0) -> Stream #0:0 (aac)
  
    Stream #0:0 -> #0:1 (mpeg4 (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  [Parsed_amerge_0 @ 00000218cb4c1640] No channel layout for input 1
  
  [libx264 @ 00000218cb4acdc0] using SAR=1/1
  
  [libx264 @ 00000218cb4acdc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  [libx264 @ 00000218cb4acdc0] profile High, level 5.0, 4:2:0, 8-bit
  
  [libx264 @ 00000218cb4acdc0] 264 - core 159 - H.264/MPEG-4 AVC codec - Copyleft 2003-2019 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'Videos/ScreenCapture24.mp4':
  
    Metadata:
  
      encoder         : Lavf58.37.100
  
      Stream #0:0: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 69 kb/s
  
      Metadata:
  
        encoder         : Lavc58.67.101 aac
  
      Stream #0:1: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 2560x1080 [SAR 1:1 DAR 64:27], q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc (default)
  
      Metadata:
  
        encoder         : Lavc58.67.101 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
  
  [matroska,webm @ 00000218cb44af00] File ended prematurely
  
  frame=  297 fps=113 q=-1.0 Lsize=    2325kB time=00:01:09.07 bitrate= 275.8kbits/s dup=22 drop=0 speed=26.2x    
  
  video:1713kB audio:591kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.900237%
  
  [aac @ 00000218cb4ab780] Qavg: 24995.135
  
  [libx264 @ 00000218cb4acdc0] frame I:4     Avg QP:15.13  size:199596
  
  [libx264 @ 00000218cb4acdc0] frame P:85    Avg QP:21.15  size:  9466
  
  [libx264 @ 00000218cb4acdc0] frame B:208   Avg QP:24.93  size:   725
  
  [libx264 @ 00000218cb4acdc0] consecutive B-frames:  5.1%  2.7%  6.1% 86.2%
  
  [libx264 @ 00000218cb4acdc0] mb I  I16..4: 48.0% 45.3%  6.7%
  
  [libx264 @ 00000218cb4acdc0] mb P  I16..4:  1.6%  1.9%  0.8%  P16..4:  1.4%  0.4%  0.3%  0.0%  0.0%    skip:93.7%
  
  [libx264 @ 00000218cb4acdc0] mb B  I16..4:  0.1%  0.1%  0.0%  B16..8:  3.0%  0.1%  0.0%  direct: 0.0%  skip:96.6%  L0:51.2% L1:48.3% BI: 0.6%
  
  [libx264 @ 00000218cb4acdc0] 8x8 transform intra:44.4% inter:69.1%
  
  [libx264 @ 00000218cb4acdc0] coded y,uvDC,uvAC intra: 23.8% 27.4% 19.5% inter: 0.2% 0.3% 0.1%
  
  [libx264 @ 00000218cb4acdc0] i16 v,h,dc,p: 54% 45%  1%  0%
  
  [libx264 @ 00000218cb4acdc0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 20% 41%  2%  2%  1%  2%  1%  5%
  
  [libx264 @ 00000218cb4acdc0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 29% 35% 17%  2%  3%  3%  4%  2%  4%
  
  [libx264 @ 00000218cb4acdc0] i8c dc,h,v,p: 61% 25% 11%  2%
  
  [libx264 @ 00000218cb4acdc0] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 00000218cb4acdc0] ref P L0: 68.0%  6.3% 16.6%  9.1%
  
  [libx264 @ 00000218cb4acdc0] ref B L0: 70.2% 23.7%  6.1%
  
  [libx264 @ 00000218cb4acdc0] ref B L1: 91.1%  8.9%
  
  [libx264 @ 00000218cb4acdc0] kb/s:1415.80

• pip install av produces a LINK 1181 error

  6 février 2020, par user8606643

  initially, pip install av asked me to download visual C++ 14 build tools which I did
  but it is still showing me LINK 1181 errors

  I need this pyAV pakcage which is obtained by pip install av for a project, but it always shows some kind of error linked with C++ and i also have ffmpeg installed.

  C:\Users\manop>pip install av
  
  Collecting av
  
    Using cached av-7.0.0.tar.gz (2.3 MB)
  
  Building wheels for collected packages: av
  
    Building wheel for av (setup.py) ... error
  
    ERROR: Command errored out with exit status 1:
  
     command: 'c:\users\manop\appdata\local\programs\python\python37\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\manop\\AppData\\Local\\Temp\\pip-install-rydo0uqj\\av\\setup.py'"'"'; __file__='"'"'C:\\Users\\manop\\AppData\\Local\\Temp\\pip-install-rydo0uqj\\av\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' bdist_wheel -d 'C:\Users\manop\AppData\Local\Temp\pip-wheel-oti9y28m'
  
         cwd: C:\Users\manop\AppData\Local\Temp\pip-install-rydo0uqj\av\
  
    Complete output (38 lines):
  
    running bdist_wheel
  
    running build
  
    running build_py
  
    creating build
  
    creating build\lib.win-amd64-3.7
  
    creating build\lib.win-amd64-3.7\av
  
    copying av\datasets.py -> build\lib.win-amd64-3.7\av
  
    copying av\deprecation.py -> build\lib.win-amd64-3.7\av
  
    copying av\__init__.py -> build\lib.win-amd64-3.7\av
  
    copying av\__main__.py -> build\lib.win-amd64-3.7\av
  
    creating build\lib.win-amd64-3.7\av\audio
  
    copying av\audio\__init__.py -> build\lib.win-amd64-3.7\av\audio
  
    creating build\lib.win-amd64-3.7\av\codec
  
    copying av\codec\__init__.py -> build\lib.win-amd64-3.7\av\codec
  
    creating build\lib.win-amd64-3.7\av\container
  
    copying av\container\__init__.py -> build\lib.win-amd64-3.7\av\container
  
    creating build\lib.win-amd64-3.7\av\data
  
    copying av\data\__init__.py -> build\lib.win-amd64-3.7\av\data
  
    creating build\lib.win-amd64-3.7\av\filter
  
    copying av\filter\__init__.py -> build\lib.win-amd64-3.7\av\filter
  
    creating build\lib.win-amd64-3.7\av\sidedata
  
    copying av\sidedata\__init__.py -> build\lib.win-amd64-3.7\av\sidedata
  
    creating build\lib.win-amd64-3.7\av\subtitles
  
    copying av\subtitles\__init__.py -> build\lib.win-amd64-3.7\av\subtitles
  
    creating build\lib.win-amd64-3.7\av\video
  
    copying av\video\__init__.py -> build\lib.win-amd64-3.7\av\video
  
    running build_ext
  
    running config
  
    writing build\temp.win-amd64-3.7\Release\include\pyav\config.h
  
    running cythonize
  
    building 'av.buffer' extension
  
    creating build\temp.win-amd64-3.7\Release\src
  
    creating build\temp.win-amd64-3.7\Release\src\av
  
    C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -Ic:\users\manop\appdata\local\programs\python\python37\include -Ibuild\temp.win-amd64-3.7\Release\include -Iinclude -Ic:\users\manop\appdata\local\programs\python\python37\include -Ic:\users\manop\appdata\local\programs\python\python37\include -Ibuild\temp.win-amd64-3.7\Release\include "-IC:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.16.27023\Include" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\shared" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\um" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\winrt" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\ucrt" /Tcsrc\av\buffer.c /Fobuild\temp.win-amd64-3.7\Release\src\av\buffer.obj
  
    buffer.c
  
    C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\link.exe /nologo /INCREMENTAL:NO /LTCG /DLL /MANIFEST:EMBED,ID=2 /MANIFESTUAC:NO /LIBPATH:c:\users\manop\appdata\local\programs\python\python37\PCbuild\amd64 /LIBPATH:c:\users\manop\appdata\local\programs\python\python37\libs /LIBPATH:c:\users\manop\appdata\local\programs\python\python37\libs /LIBPATH:c:\users\manop\appdata\local\programs\python\python37\PCbuild\amd64 "/LIBPATH:C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.16.27023\Lib\x64" "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.18362.0\um\x64" /LIBPATH:C:\WINDOWS\Microsoft.NET\Framework64\v4.0.30319 "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.18362.0\ucrt\x64" swresample.lib swscale.lib avdevice.lib avutil.lib avcodec.lib avformat.lib avfilter.lib /EXPORT:PyInit_buffer build\temp.win-amd64-3.7\Release\src\av\buffer.obj /OUT:build\lib.win-amd64-3.7\av\buffer.cp37-win_amd64.pyd /IMPLIB:build\temp.win-amd64-3.7\Release\src\av\buffer.cp37-win_amd64.lib /OPT:NOREF
  
    LINK : fatal error LNK1181: cannot open input file 'swresample.lib'
  
    error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\Community\\VC\\Tools\\MSVC\\14.16.27023\\bin\\HostX64\\x64\\link.exe' failed with exit status 1181
  
    ----------------------------------------
  
    ERROR: Failed building wheel for av
  
    Running setup.py clean for av
  
  Failed to build av
  
  Installing collected packages: av
  
      Running setup.py install for av ... error
  
      ERROR: Command errored out with exit status 1:
  
       command: 'c:\users\manop\appdata\local\programs\python\python37\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\manop\\AppData\\Local\\Temp\\pip-install-rydo0uqj\\av\\setup.py'"'"'; __file__='"'"'C:\\Users\\manop\\AppData\\Local\\Temp\\pip-install-rydo0uqj\\av\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record 'C:\Users\manop\AppData\Local\Temp\pip-record-xac0xiy4\install-record.txt' --single-version-externally-managed --compile --install-headers 'c:\users\manop\appdata\local\programs\python\python37\Include\av'
  
           cwd: C:\Users\manop\AppData\Local\Temp\pip-install-rydo0uqj\av\
  
      Complete output (38 lines):
  
      running install
  
      running build
  
      running build_py
  
      creating build
  
      creating build\lib.win-amd64-3.7
  
      creating build\lib.win-amd64-3.7\av
  
      copying av\datasets.py -> build\lib.win-amd64-3.7\av
  
      copying av\deprecation.py -> build\lib.win-amd64-3.7\av
  
      copying av\__init__.py -> build\lib.win-amd64-3.7\av
  
      copying av\__main__.py -> build\lib.win-amd64-3.7\av
  
      creating build\lib.win-amd64-3.7\av\audio
  
      copying av\audio\__init__.py -> build\lib.win-amd64-3.7\av\audio
  
      creating build\lib.win-amd64-3.7\av\codec
  
      copying av\codec\__init__.py -> build\lib.win-amd64-3.7\av\codec
  
      creating build\lib.win-amd64-3.7\av\container
  
      copying av\container\__init__.py -> build\lib.win-amd64-3.7\av\container
  
      creating build\lib.win-amd64-3.7\av\data
  
      copying av\data\__init__.py -> build\lib.win-amd64-3.7\av\data
  
      creating build\lib.win-amd64-3.7\av\filter
  
      copying av\filter\__init__.py -> build\lib.win-amd64-3.7\av\filter
  
      creating build\lib.win-amd64-3.7\av\sidedata
  
      copying av\sidedata\__init__.py -> build\lib.win-amd64-3.7\av\sidedata
  
      creating build\lib.win-amd64-3.7\av\subtitles
  
      copying av\subtitles\__init__.py -> build\lib.win-amd64-3.7\av\subtitles
  
      creating build\lib.win-amd64-3.7\av\video
  
      copying av\video\__init__.py -> build\lib.win-amd64-3.7\av\video
  
      running build_ext
  
      running config
  
      writing build\temp.win-amd64-3.7\Release\include\pyav\config.h
  
      running cythonize
  
      building 'av.buffer' extension
  
      creating build\temp.win-amd64-3.7\Release\src
  
      creating build\temp.win-amd64-3.7\Release\src\av
  
      C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -Ibuild\temp.win-amd64-3.7\Release\include -Iinclude -Ic:\users\manop\appdata\local\programs\python\python37\include -Ic:\users\manop\appdata\local\programs\python\python37\include -Ic:\users\manop\appdata\local\programs\python\python37\include -Ibuild\temp.win-amd64-3.7\Release\include "-IC:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.16.27023\Include" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\shared" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\um" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\winrt" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\ucrt" /Tcsrc\av\buffer.c /Fobuild\temp.win-amd64-3.7\Release\src\av\buffer.obj
  
      buffer.c
  
      C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.16.27023\bin\HostX64\x64\link.exe /nologo /INCREMENTAL:NO /LTCG /DLL /MANIFEST:EMBED,ID=2 /MANIFESTUAC:NO /LIBPATH:c:\users\manop\appdata\local\programs\python\python37\PCbuild\amd64 /LIBPATH:c:\users\manop\appdata\local\programs\python\python37\libs /LIBPATH:c:\users\manop\appdata\local\programs\python\python37\libs /LIBPATH:c:\users\manop\appdata\local\programs\python\python37\PCbuild\amd64 "/LIBPATH:C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.16.27023\Lib\x64" "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.18362.0\um\x64" /LIBPATH:C:\WINDOWS\Microsoft.NET\Framework64\v4.0.30319 "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.18362.0\ucrt\x64" avutil.lib avfilter.lib swresample.lib swscale.lib avformat.lib avcodec.lib avdevice.lib /EXPORT:PyInit_buffer build\temp.win-amd64-3.7\Release\src\av\buffer.obj /OUT:build\lib.win-amd64-3.7\av\buffer.cp37-win_amd64.pyd /IMPLIB:build\temp.win-amd64-3.7\Release\src\av\buffer.cp37-win_amd64.lib /OPT:NOREF
  
      LINK : fatal error LNK1181: cannot open input file 'avutil.lib'
  
      error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\Community\\VC\\Tools\\MSVC\\14.16.27023\\bin\\HostX64\\x64\\link.exe' failed with exit status 1181
  
      ----------------------------------------
  
  ERROR: Command errored out with exit status 1: 'c:\users\manop\appdata\local\programs\python\python37\python.exe' -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\manop\\AppData\\Local\\Temp\\pip-install-rydo0uqj\\av\\setup.py'"'"'; __file__='"'"'C:\\Users\\manop\\AppData\\Local\\Temp\\pip-install-rydo0uqj\\av\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record 'C:\Users\manop\AppData\Local\Temp\pip-record-xac0xiy4\install-record.txt' --single-version-externally-managed --compile --install-headers 'c:\users\manop\appdata\local\programs\python\python37\Include\av' Check the logs for full command output.

  These are my visual C++ selections :
  my visual studio installer individual components selection