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• Python script fails execution on subprocess.run() call only when called from context menu

  10 mars 2019, par Jesse McDonald

  I have a python script that I want to call from the windows file browser context menu (https://www.howtogeek.com/107965/how-to-add-any-application-shortcut-to-windows-explorers-context-menu/)

  I am currently debugging calling it from the non-specific context (HKEY_CLASSES_ROOT\Directory\Background\shell) with the command "python "D :\toolbox\mineAudio.py" 0"
  (note python3 is on the path as python and the script is at D :\toolbox\mineAudio.py)

  When I call the script from cmd it works as expected with that command, and when I make debug modifications to the script (adding os.system("pause") to random lines) I can verify it is running correctly up to the point it hits the line meta=cmd(['ffmpeg','-i',target]) (line 46) where it instantly and silently fails (note ffmpeg is also on the path)

  EDIT : it actually gets as far as line 15

  result = subprocess.run(command, stdout=subprocess.PIPE,stderr=subprocess.PIPE,startupinfo=startupinfo)

  I cant figure out why the program is failing there as that line works fine everywhere else I have tested the script from other than the context menu.

  Here is the full script if you want to brows through it

  import subprocess
  
  import os
  
  import sys
  
  from sys import argv
  
  from tree import tree
  
  #for command line use:
  
  #mineAudo.py [prompt=1] [dir=cwd]
  
  #first arg prompt will prompt user for dir if 1, otherwise it wont
  
  #second arg is the directory to use, if specified this will override prompt, if not and prompt=0, current working dir is used
  
  def cmd(command):
  
      startupinfo = subprocess.STARTUPINFO()
  
      startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
  
      startupinfo.wShowWindow = subprocess.SW_HIDE
  
      result = subprocess.run(command, stdout=subprocess.PIPE,stderr=subprocess.PIPE,startupinfo=startupinfo)
  
      return result.stderr.decode("utf-8")
  
  def stripStreams(meta):
  
      i=1;
  
      lines=[]
  
      while i>0 :
  
          i=meta.find("Stream",i+1)
  
          lineEnd=meta.find("\n",i)
  
          lines.append(meta[i:lineEnd])
  
  
  
      return lines
  
  def mineAudio(streams):
  
      ret=[]
  
      for stream in streams:
  
          if "Audio:" in stream:
  
              start =stream.find("#")+1
  
              end=stream.find("(",start)
  
              ret.append(stream[start:end])
  
      return ret
  
  def convDir(dirTarget):
  
      targets=tree(dirTarget)
  
      convList(targets,dirTarget)
  
  
  
  def convList(targets,dirTarget):
  
          print(targets)
  
          #target="2018-05-31 06-16-39.mp4"
  
          i=0
  
          for target in targets:
  
              i+=1
  
  
  
              if(target[target.rfind("."):]==".mp4"):
  
                  print("("+str(i)+"/"+str(len(targets))+") starting file "+target)
  
                  meta=cmd(['ffmpeg','-i',target])
  
                  streams=stripStreams(meta)
  
                  streams=mineAudio(streams)
  
                  count=0
  
                  output=target[target.rfind("/")+1:target.rfind(".")]
  
                  file=target[target.rfind("/")+1:]
  
                  #print (output)
  
                  try:
  
                      os.mkdir(dirTarget+"\\"+output)
  
                  except:
  
                      pass
  
                  for s in streams:
  
                      print("converting track "+str(count+1)+" of "+str(len(streams)));
  
                      count+=1
  
                      cmd("ffmpeg -i \""+target+"\" -vn -sn -c:a mp3 -ab 192k -map "+s+" \""+dirTarget+"\\"+output+"\\"+output+" Track "+str(count)+".mp3\"")
  
                  print("moving "+target+" to "+dirTarget+"\\"+output+"\\"+file)
  
                  os.rename(target,dirTarget+"\\"+output+"\\"+file)
  
                  print("Finished file "+target)
  
              else:
  
                  print("("+str(i)+"/"+str(len(targets))+") skiping non mp4 file "+target)
  
  
  
  def prompt():
  
      while True:
  
          dirTarget=input("input target dir: ")
  
          convDir(dirTarget)
  
  
  
  
  
  
  
  if __name__ == "__main__":
  
          sys.setrecursionlimit(2000)    
  
          if len(argv)>2:
  
                  if os.path.isdir(argv[2]):
  
                      convDir(argv[2])
  
                  else:
  
                      convList([argv[2]],os.path.dirname(argv[2]))
  
          elif(len(argv)>1):
  
                  if int(argv[1])==1:
  
                      prompt()
  
                  else:
  
                      convDir(os.getcwd())
  
          else:
  
              prompt()
  
  
  
  
  
          os.system("pause")

  Note that I am not married to this particular implementation, any implementation with the same effect (extracting the .mp3 tracks from an .mp4 file automatically) would be fine too

  also, here is the file Tree

  #Returns the paths of all files in a directory and all sub directories relative to start directory
  
  import os
  
  def tree(directory,target="f"):
  
      paths=[]
  
      for currentDir,dirs,files in os.walk(directory):
  
          if target=="f":
  
              for file in files:
  
                  paths.append(currentDir+"/"+file)
  
          if target=="d":
  
              #paths.append(currentDir)
  
              for dir in dirs:
  
                  paths.append(currentDir+"/"+dir)
  
      for i in range(len(paths)):
  
          paths[i]=paths[i].replace("\\","/")
  
      return paths

  Can anyone help me get this working ?

  Edit :
  here is a shorter example code that crashes in the same way (still uses ffmpeg though)

  import subprocess
  
  import os
  
  def cmd(command):
  
      startupinfo = subprocess.STARTUPINFO()
  
      startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
  
      startupinfo.wShowWindow = subprocess.SW_HIDE
  
  
  
      result = subprocess.run(command,stdin=subprocess.DEVNULL, stdout=subprocess.PIPE,stderr=subprocess.PIPE,startupinfo=startupinfo)
  
  
  
      return result.stderr.decode("utf-8")
  
  
  
  
  
  os.system("pause")
  
  
  
  out=cmd(['ffmpeg','-i','D:\\ffmpeg test\\test\\2018-05-31 06-16-39\\2018-05-31 06-16-39.mp4'])
  
  print(out)
  
  os.system("pause")

  (note the file is hard coded, program output should be
  )

• Revision 83eb1975df : partition context update speedup This removes a lot of operations in setting pa

  17 novembre 2013, par Jim Bankoski

  Changed Paths :
   Modify /vp9/common/vp9_common_data.c

  
   Modify /vp9/common/vp9_onyxc_int.h

  
  
  partition context update speedup

  This removes a lot of operations in setting partition context...

  Change-Id : I365e6f5607ece85190cb21443988816dfa510ce3

• lavd/v4l2 : do not clobber the context FD in v4l2_get_device_list()

  25 novembre 2021, par Anton Khirnov

  lavd/v4l2 : do not clobber the context FD in v4l2_get_device_list()
  The FD opened here is local to the loop iteration, there is no reason to
  
  store it in the context. Since read_header() may have already been
  
  called, this may ovewrite an existing valid FD.
  

  • [DH] libavdevice/v4l2.c