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• ffmpeg through python subprocess fails to find camera

  27 juillet 2021, par Ofer Sadan

  Weird problem here, i use this command to capture my webcam through ffmpeg (through cmd on windows) :

  



  ffmpeg -y -t 300 -rtbufsize 1024M -f dshow -i video="Lenovo EasyCamera" -c:v libx264 -preset veryslow -crf 25 Desktop.mkv


  



  and everything works fine. But when i try the very same command through python as a subprocess it fails. Here's the python code :

  



  from subprocess import Popen
cmd = ['ffmpeg', '-y', '-t', '300', '-rtbufsize', '1024M', '-f', 'dshow', '-i', 'video="Lenovo EasyCamera"', '-c:v', 'libx264', '-preset', 'veryslow', '-crf', '25', 'Desktop.mkv']
p = Popen(cmd)


  



  Outputs the following error and freezes :

  



  [dshow @ 00000000023a2cc0] Could not find video device with name ["Lenovo EasyCamera"] among source devices of type video.
video="Lenovo EasyCamera": I/O error


  



  Can anyone figure this out and tell me what i'm doing wrong ? Or is it some known bug in python or the subprocess module (using python 3.6.1, but not attached to the specific version if it will help me solve this problem) ?

  



  Thanks in advance !

  



  P.S. This question is a follow up to this one, if that's relevant : How to grab laptop webcam video with ffmpeg in windows

  


• TCL script unable to work with multiple camera on windows 7 platform

  27 novembre 2017, par M. D. P

  My TCL script works properly for single camera. the TCL script is as follow :

  proc liveStreaming {} {
  
  
  
      #open the config file.
  
      set f [open "C:/main/video_config.txt" r] 
  
  
  
      #To retrive the values from the config file.
  
      while {![eof $f]} {
  
          set part [split [gets $f] "="]
  
          set props([string trimright [lindex $part 0]]) [string trimleft [lindex $part 1]]
  
      }
  
      close $f 
  
  
  
      #camera selection to live streaming.
  
      set camera "video"
  
      append cctv $camera "=" $props(cctv)
  
  
  
      #ffmpeg command to capture live streaming in background
  
      exec ffmpeg -f dshow -s 1280x720 -i $cctv c:/test/sample.avi >& c:/test/temp.txt &
  
  
  
  }
  
  liveStreaming
  
  
  
  //above code is to capture video using ffmpeg and tcl.

  My text file "video_config" is as follow :

  cctv=Logitech HD Webcam C525

  as, i want it to run with multiple camera : the text file should be as follow :

  cctv=Integrated Webcam,Logitech HD Webcam C525

  The problem is "," (comma), my TCL script is unable to predict the coma (,) . can any one provide me the proper TCL script which can predict the coma, so that my TCL script can work with multiple camera.

  Error Report :

  ffmpeg version N-89127-g8f4702a93f Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --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-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx
  
    libavutil      56.  0.100 / 56.  0.100
  
    libavcodec     58.  3.103 / 58.  3.103
  
    libavformat    58.  2.100 / 58.  2.100
  
    libavdevice    58.  0.100 / 58.  0.100
  
    libavfilter     7.  2.100 /  7.  2.100
  
    libswscale      5.  0.101 /  5.  0.101
  
    libswresample   3.  0.101 /  3.  0.101
  
    libpostproc    55.  0.100 / 55.  0.100
  
  [dshow @ 05944ac0] Could not find video device with name [Integrated Webcam,Logitech HD Webcam C525] among source devices of type video.
  
  video=Integrated Webcam,Logitech HD Webcam C525: I/O error

• how to have live video streaming using ffmpeg command or using tcl 8.0 script on windows 10 platform [duplicate]

  16 novembre 2017, par M. D. P

  This question is an exact duplicate of :

  • How to stream live-video display from a webcam using FFMPEG command on tcl version 8.0 and windows 7 ?
    
    1 answer
    

  I am able to capture the video and image by using ffmpeg in tcl script, but I want to have live video streaming for my multiple webcams for tcl version 8.0 on windows 10.

  I tryed :

  ffmpeg -f vfwcap -r 25 -i 0 sample.avi

  for video capturing, it works

  ffmpeg -f vfwcap -r 25 -i 0 

  and I tried this for live video streaming by it didn’t http://wiki.tcl.tk/40194
  So what will be the right command for live video streaming.

  exec [list ffmpeg -f dshow -t 00:00:10 -i "video=Integrated Webcam" -b 5000k -s 1280x720 c :/test/sample-a.avi] &

  also tried with this, still not working