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• Install ffmpeg in MAMP

  19 juin 2017, par David Liu

  I’m trying to use this : https://www.youphptube.com/ to create a video sharing website.

  I’m developing locally using MAMP on macOS Sierra and have installed both ffmpeg and exiftool on the system, but how do I make it work from within the server ? Under "Advanced Configuration" what do I put in "Path to FFMPEG" and "Path to exiftool" ? What is the folder this path is relative to ? I guess this is why the videos I try to upload never start encoding. In "Leave blank for native ffmpeg" what does "native ffmpeg" mean ?

  I already tried putting the absolute paths but it doesn’t work either. I’m getting this error log :

  [19-Jun-2017 13:59:13 America/Panama] "status" :"error", "msg" :["sh : ffprobe : command not found"] ,"return_val":127, "where" :"getDuration", "cmd" :"ffprobe -i /Applications/MAMP/tmp/php/phpq2j0pt -sexagesimal -show_entries format=duration -v quiet -of csv=’p=0’"
  [19-Jun-2017 13:59:13 America/Panama] Duration founded : EE:EE:EE
  [19-Jun-2017 18:59:14 UTC] rm -f /Applications/MAMP/htdocs/platea-3/videos/video2_59481f01ed6179.69459230.jpg && ffmpeg -ss 5 -i /Applications/MAMP/htdocs/platea-3/videos/original_video2_59481f01ed6179.69459230 -qscale:v 2 -vframes 1 -y /Applications/MAMP/htdocs/platea-3/videos/video2_59481f01ed6179.69459230.jpg
  Array
  (
  [0] => sh : ffmpeg : command not found
  )

  So basically I think the server doesn’t find neither ffmpeg nor ffprobe.

  I would appreciate it if someone could take the time to install it as well and take a look. Thanks !

• How can I make ffmpeg executable file separately by using gcc command ?

  8 juillet 2017, par koseonjae

  actually, my goal is to use ffmpeg on Qt platform. But tow of them is unfamiliar with me..
  I tried command on ./ffmpeg directory after build (./configure, make, sudo make install) as below on Mac (os x) 10.12.4 (Sierra)

  $ gcc ffmpeg.c -o a.out -I /usr/local/include -I /Users/koseonjae/ffmpeg -L /usr/local/lib -lavdevice -lavutil -lavformat -lavcodec -lavutil -lx264 -lvpx -lvorbisenc -lvorbis -ltheoraenc -ltheoradec -logg -lmp3lame -lbz2 -lz -lxslt -lfdk-aac -liconv -lopus -lx265 -lxvidcore -lpng16 -lswresample -framework CoreFoundation -framework CoreServices -framework AudioUnit -framework AudioToolbox -framework CoreAudio -framework AVFoundation -framework CoreMedia -framework CoreVideo -framework CoreAudio -framework Foundation -framework Security -framework VideoDecodeAcceleration -framework VideoToolbox

  I added many library, but result is as below

  /Users/koseonjae/ffmpeg/ffmpeg2.h:157:8 : error : unknown type name ’BOOL’
  static BOOL WINAPI CtrlHandler(DWORD fdwCtrlType) ;

  /Users/koseonjae/ffmpeg/ffmpeg2.h:157:19 : error : expected ’ ;’ after top level declarator
  static BOOL WINAPI CtrlHandler(DWORD fdwCtrlType) ;

  ---

  what library should I add ?? thank you !

• OpenCV (3.3.0) returns fail on VideoCapture with Video but works with Webcam [OS X]

  1er novembre 2017, par njoye

  Thanks for reading already, I’ve been trying to get this to work for a day and I didn’t get closer to the solution.

  I’m trying to get this object tracker to work. When I use a video from my webcam (with : python object-tracker-single.py -d 0, everything works as expected.

  But as soon as I’m trying to use a video file (i’ve tried different formats : .mp4, .mkv & .avi. I also tried to use the file given in the repository, that didn’t work as well. To see if there is a File not found-Error, I passed an invalid path to the function and an error got printed, that has not been printed when I used the other videos. So the file(s) i’m using is(/are) valid and not corrupted.

  I installed dlib through homebrew following this article and compiled OpenCV from the official source. This is the CMakeCache.txt that CMake spit out. After the first time I compiled it, I added opencv_contrib to the mix, thinking that it could help (I also think that I actually needed it), but that didn’t fix the problem.

  This is the code I’m having problems with :

  # Create the VideoCapture object
  
  cam = cv2.VideoCapture(source)
  
  
  
  # If Camera Device is not opened, exit the program
  
  if not cam.isOpened():
  
      print "Video device or file couldn't be opened"
  
      exit()
  
  
  
  print "Press key `p` to pause the video to start tracking"
  
  while True:
  
      # Retrieve an image and Display it.
  
      retval, img = cam.read() #<-- this returns false when trying to read a video 
  
      if not retval:
  
          print "Cannot capture frame device"
  
          exit()

  At the marked line, retval equals False and image equals None.
  It would already help me if I could somehow debug this behavior, but I didn’t find any way of doing so.

  I found that many Windows Users had problems with missing ffmpeg support, but that is not the case for me, since I used ffmpeg in previous (not OpenCV-related) projects and CMakeCache.txt reports that ffmpeg has been found and the compilation succeeded.

  I also tried using a fully qualified file-name for the video file, which either resulted in Video device or file couldn't be opened or the given problem.

  If you have any idea how this problem can be completely resolved, have an Idea on how to solve it or can provide me with a way of properly debugging this behavior, I’d be super glad to here it !

  Thanks already !

  -

  System : MacBook Pro (macOS Sierra 10.12.6)

  OpenCV Version : 3.3.0

  Dlib Version (not necessary imo, but hey) : 19.4.0

  Edit 2
  Output of cmake -DOPENCV_EXTRA_MODULES_PATH=../opencv_contrib-master/modules ../ >> result.txt : pastebin