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• Permission denied when trying to call ffmpeg on heroku

  1er décembre 2013, par chuck w

  I have a rails 3.1 web app on Heroku (cedar) that that allows users to post stories with photo and video attachments using the paperclip gem (3.5.1). Uploads are stored on s3. This has been working 100% for many months.

  I have recently added video transcoding and thumbnailing to my dev machine with the paperclip-ffmpeg gem (1.0.1) and ffmpeg running locally. This is also working.

  I've followed these instructions to build and install ffmpeg on heroku, and I've altered my Heroku app's path so that it reads as follows :

  PATH:   bin:vendor/ffmpeg/bin:vendor/bundle/ruby/1.9.1/bin:/usr/local/bin:/usr/bin:/bin

  and my app's LD_LIBRARY_PATH so that it reads as follows :

  LD_LIBRARY_PATH:             vendor/ffmpeg/lib:/usr/local/lib

  Finally, I've vendored ffmpeg into my app with the following structure :

  

  When I commit and push these changes to Heroku and POST a story that has a video I get the following output on Heroku logs :

  2013-11-30T22:51:46.711010+00:00 app[web.1]: Started POST "/stories" for 71.80.218.93 at        
  
  2013-11-30 22:51:46 +0000
  
  2013-11-30T22:51:47.023119+00:00 app[web.1]: Cocaine::ExitStatusError (Command 'ffprobe 
  
  "/tmp/sideways video20131130-2-14w1q4j.mp4" 2>&1' returned 126. Expected 0
  
  2013-11-30T22:51:47.023119+00:00 app[web.1]: Here is the command output:
  
  2013-11-30T22:51:47.023119+00:00 app[web.1]: 
  
  2013-11-30T22:51:47.023119+00:00 app[web.1]:   app/controllers/stories_controller.rb:11:in     
  
  `create'
  
  2013-11-30T22:51:47.023119+00:00 app[web.1]: 
  
  2013-11-30T22:51:47.023119+00:00 app[web.1]: 
  
  2013-11-30T22:51:47.019228+00:00 heroku[router]: at=info method=POST path=/stories     
  
  host=myapp.herokuapp.com fwd="71.80.218.93" dyno=web.1 connect=1ms    
  
  service=3130ms status=500 bytes=754
  
  2013-11-30T22:51:47.023119+00:00 app[web.1]: 
  
  2013-11-30T22:51:47.023600+00:00 app[web.1]: cache: [POST /stories] invalidate, pass
  
  2013-11-30T22:51:47.023119+00:00 app[web.1]: sh: ffprobe: Permission denied
  
  2013-11-30T22:51:47.023119+00:00 app[web.1]: ):

  Also, running the console command : heroku run "ffmpeg -version" -a myapp
  returns :

  Running ffmpeg -version attached to terminal... up, run.6591
  
  bash: vendor/ffmpeg/bin/ffmpeg: Permission denied

  Here is my Post model paperclip set-up :

  class Post < ActiveRecord::Base
  
  
  
    attr_accessible :contents, :photo, :video
  
  
  
    belongs_to    :story, :touch => true
  
    belongs_to    :user, :touch => true
  
  
  
    has_attached_file :photo, 
  
                      :styles => { 
  
                        :thumb => ["100x140>", :jpg],
  
                        :medium => ["400x400>", :jpg],
  
                        :large => ["800x800>", :jpg]
  
                      },
  
                      :processors => [:thumbnail],
  
                      :storage => :s3,
  
                      :s3_credentials => "#{Rails.root.to_s}/config/s3.yml",
  
                      :path => "/:style/:id/:filename"
  
  
  
    has_attached_file :video, 
  
                      :storage => :s3,
  
                      :s3_credentials => "#{Rails.root.to_s}/config/s3.yml",
  
                      :path => "/video/:id/:filename",
  
                      :styles => {
  
                        :thumb => { :geometry => "140x100#", :format => 'jpg', :time => 10 },
  
                        :medium => { :geometry => "480x360", :format => 'mp4' },
  
                      }, :processors => [:ffmpeg]

  Why am I getting these "permission denieds" ? Any help would be greatly appreciated !!!

• Using ffmpeg to create video from images - Python [duplicate]

  24 mars 2017, par Harel

  This question already has an answer here :

  • Communicate multiple times with a process without breaking the pipe ?
    
    4 answers
    

  I’m using FFMPEG in python (using this tutorial) and my main goal is to take a screenshot and append it into an existing mp4 video(append it using the encoder, not raw appending).

  That’s the code I’m using right now, this script only writes a video of one frame(the first screenshot) and doesn’t do anything with all the other screenshots.

  command = [ FFMPEG_BIN,
  
      '-f', 'rawvideo',
  
      '-codec', 'rawvideo',
  
      '-s', '1920x1080', # size of one frame
  
      '-pix_fmt', 'rgb24',
  
      '-r', '24', # frames per second
  
      '-i', '-', # The input comes from a pipe
  
      '-an', # Tells FFMPEG not to expect any audio
  
      '-vcodec', 'mpeg4',
  
      'my_output_videofile.mp4' ]
  
  
  
  for x in range(30):
  
      pipe = sp.Popen(command, stdin = sp.PIPE, stderr = sp.PIPE)
  
      im = np.array(ImageGrab.grab()).tostring()
  
      pipe.communicate(input = im)
  
      pipe.stdin.close()
  
      if pipe.stderr is not None:
  
          pipe.stderr.close()
  
      pipe.wait()

  Edit :
  Apparently using Popen.communicate breaks the pipe (Thanks to Peter Wood !).

  After fixing the pipe breaking scenario I have encountered another problem, after writing 235 frames to the video the program crashes.

  The new edited script :

  command = [ FFMPEG_BIN,
  
      '-y',
  
      '-f', 'rawvideo',
  
      '-codec', 'rawvideo',
  
      '-s', '1920x1080', # size of one frame
  
      '-pix_fmt', 'rgb24',
  
      '-r', '24', # frames per second
  
      '-i', '-', # The input comes from a pipe
  
      '-an', # Tells FFMPEG not to expect any audio
  
      '-vcodec', 'mpeg4',
  
      'my_output_videofile.mp4' ]
  
  
  
  pipe = sp.Popen(command, stdin = sp.PIPE, stderr = sp.PIPE)
  
  
  
  for x in range(300):
  
      print x
  
  
  
      im = np.array(ImageGrab.grab()).tostring()
  
      pipe.stdin.write(im)
  
      pipe.stdin.flush()

• OpenCv is giving error to play the downloaded video

  17 août 2015, par Prat_yow

  Program a code for a tiny system, which should run on Linux :
   A routine (P) accepts strings from an unknown remote Internet source,
  which contain just an URL and a file name.
   The URL and the file name point to a multimedia file, in our case a video
   (P) separates the file name from the string
   (P) checks if the file already exists on the system’s internal memory card, as
  (P) is running on a tiny Linux machine connected to a screen
   If it does not exist, (P) downloads the video file from the given URL and
  stores it in the memory card
   Finally, (P) opens the file and plays it as a full screen video (no external video
  player allowed !)
   After this (P) starts from the beginning
   There is no user action involved and nobody enters data by hand or mouse
  clicks

  I have written code in python. But when I run it it just not load the cv module. Can someone suggest if my approach is correct.? Will doing in java or other compiled language will be easy.?

  My code is :

  import os
  
  import urllib
  
  import cv
  
  import sys
  
  
  
  """
  
  The following program will take the url as input. Separate the file name of the video from the url
  
  and check if the file is present in the current memory location or not. If the same file is present
  
  it will indicate its presence. If the file is not present it will download the file and play it.
  
  
  
  urrlib: to download the video file.
  
  cv: For playing the video.
  
  
  
  """
  
  
  
  #NOTE Configuration of FFMPEG and OpenCV  is required. 
  
  #NOTE Assuming that the given code is execute from the internal memory location.
  
  #NOTE Assuming the URL is of the form <initial part="part" of="of" the="the" url="url"></initial><filename>.<format>
  
  
  
  sys.path.append('/opt/ros/hydro/lib/python2.7/dist-packages')
  
  
  
  def myVideo(url):
  
      search_folder = "."
  
      videoFile = url.split('/')[-1].split('#')[0].split('?')[0] #stripping the name of the file.
  
  
  
      for root, dirs, files in os.walk(search_folder): # using the os.walk module to find the files.
  
          for name in files:
  
              #print os.path.join(name)
  
  
  
              """Checking the videofile in the current directory and the sub-directories"""
  
  
  
              if videoFile == os.path.join(name):  #checking if the file is already present in the internal memory.
  
                  print "The file is already present in the internal memory"
  
                  return -1  # Returning the confirmation that the file is present.
  
  
  
              else:
  
                  print "Downloading the file"
  
                  video = urllib.FancyURLopener() #downloading the file using urllib.
  
                  video.retrieve(url,videoFile)
  
  
  
                  curDir = os.getcwd()   # getting the current working directory.
  
                  fullVideoPath = os.path.join(curDir,videoFile)  # Making the full path of the video file.
  
  
  
                  """For playing the file using openCV first read the file.
  
                  Find the number of frames and the frame rate.
  
                  Finally use these parameters to display each extracted frame on the screen""" 
  
  
  
                  vFile = cv.CaptureFromFile(fullVideoPath)
  
                  nFrames = int(  cv.GetCaptureProperty( vidFile, cv.CV_CAP_PROP_FRAME_COUNT ) ) #Number of frames in the video.
  
                  fps = cv.GetCaptureProperty( vidFile, cv.CV_CAP_PROP_FPS ) # Frame rate
  
                  waitPerFrameInMillisec = int( 1/fps * 1000/1 ) # Wait time between frames.
  
  
  
                  for f in xrange( nFrames ):
  
                      frameImg = cv.QueryFrame( vidFile )
  
                      cv.ShowImage( "My Show",  frameImg )
  
                      cv.WaitKey( waitPerFrameInMillisec  )
  
  
  
                  cv.DestroyWindow( "My Show" ) # Deleting the window once the playing is done.
  
                  return 1 # returning the confimation that the file was played successfully.
  
  
  
  if __name__ == "__main__":
  
      url = "http://techslides.com/demos/sample-videos/small.mp4"
  
      myVideo(url)
  
  </format></filename>