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• lavc : remove the locking code in avcodec_close()

  5 avril 2014, par Anton Khirnov

  lavc : remove the locking code in avcodec_close()
  This function should not modify any global state, so there should be no
  
  reason for any locking.
  

  • [DH] libavcodec/utils.c

• ffmpeg direct show obvoius problem. ffmpeg is not letting to reconnect to camera

  11 avril 2021, par josh joyer

  I use ffmpeg with command

  


  ffmpeg -f dshow -i video="@device_pnp_\\?\usb#vid_1908&pid_2311&mi_00#6&353461d3&0&0000#{65e8773d-8f56-`11d0-a3b9-00a0c9223196}\global" output.mkv`


  


  It is fine to record camera but it uses direct show standard
Microsoft Windows library that is faulty.
Once connected to camera one is unable to use camera again or disconnect from it.
One should restart computer to connect to camera again.
Microsoft tells not to use direct show (dshow) for camera but
to use AForge or VisioForge libraries.

  


  But ffpmeg uses faulty dshow library. Is there any way to
change direct show to some other so one could connect to camer multiple times ?

  


• How to set a dictionary based off of subprocess.check_output

  5 juillet 2020, par Jessie Wilson

  This is a confusing question, however I will try to make it as clear as possible.
Currently when I build my app, if I run it via the .py file it works perfectly. However, once I compile it some parts of my app aren't functioning, specifically this code here.

  


  def ffprobe_run():
global output
global acodec_choices
run = subprocess.check_output("ffprobe " + videoinputquoted + " " + ffprobecommand, universal_newlines=True)
print(run)
if run[-2] == '3':
    acodec_choices = {"One": "1",
                      "Two": "2",
                      "Three": "3"}
elif run[-2] == '2':
    acodec_choices = {"One": "1",
                      "Two": "2",}
elif run[-2] == '1':
    acodec_choices = {"One": "1",}
print(acodec_choices.values())


  


  I am able to get the results I want with this command. Currently that's using FFPROBE to check for the amount of audio tracks there is in a file. It returns values like so

  


  1
2
3


  


  If there is 3 tracks. Or

  


  1 
2


  


  If it's two tracks. I use the command[-2]
which will give me the result of '2'

  


  So I'm taking that result and defining a dictionary to automatically populate/change an OptionMenu

  


  It defines this in my main app

  


   # Audio Stream Selection
    acodec_stream = StringVar(audio_window)
    if ffprobeinfo[-2] == '1':
        acodec_stream_choices = {'Track 1': "-map 0:a:0"}
    elif ffprobeinfo[-2] == '2':
        acodec_stream_choices = {'Track 1': "-map 0:a:0",
                                 'Track 2': "-map 0:a:1"}
    elif ffprobeinfo[-2] == '3':
        acodec_stream_choices = {'Track 1': "-map 0:a:0",
                                 'Track 2': "-map 0:a:1",
                                 'Track 3': "-map 0:a:2"}
    elif ffprobeinfo[-2] == '4':
        acodec_stream_choices = {'Track 1': "-map 0:a:0",
                                 'Track 2': "-map 0:a:1",
                                 'Track 3': "-map 0:a:2",
                                 'Track 4': "-map 0:a:3"}
    elif ffprobeinfo[-2] == '5':
        acodec_stream_choices = {'Track 1': "-map 0:a:0",
                                 'Track 2': "-map 0:a:1",
                                 'Track 3': "-map 0:a:2",
                                 'Track 4': "-map 0:a:3",
                                 'Track 5': "-map 0:a:4"}
    elif ffprobeinfo[-2] == '6':
        acodec_stream_choices = {'Track 1': "-map 0:a:0",
                                 'Track 2': "-map 0:a:1",
                                 'Track 3': "-map 0:a:2",
                                 'Track 4': "-map 0:a:3",
                                 'Track 5': "-map 0:a:4",
                                 'Track 6': "-map 0:a:5"}
    elif ffprobeinfo[-2] == '7':
        acodec_stream_choices = {'Track 1': "-map 0:a:0",
                                 'Track 2': "-map 0:a:1",
                                 'Track 3': "-map 0:a:2",
                                 'Track 4': "-map 0:a:3",
                                 'Track 5': "-map 0:a:4",
                                 'Track 6': "-map 0:a:5",
                                 'Track 7': "-map 0:a:6"}
    elif ffprobeinfo[-2] == '8':
        acodec_stream_choices = {'Track 1': "-map 0:a:0",
                                 'Track 2': "-map 0:a:1",
                                 'Track 3': "-map 0:a:2",
                                 'Track 4': "-map 0:a:3",
                                 'Track 5': "-map 0:a:4",
                                 'Track 6': "-map 0:a:5",
                                 'Track 7': "-map 0:a:6",
                                 'Track 8': "-map 0:a:7"}
    elif ffprobeinfo[-2] == '9':
        acodec_stream_choices = {'Track 1': "-map 0:a:0",
                                 'Track 2': "-map 0:a:1",
                                 'Track 3': "-map 0:a:2",
                                 'Track 4': "-map 0:a:3",
                                 'Track 5': "-map 0:a:4",
                                 'Track 6': "-map 0:a:5",
                                 'Track 7': "-map 0:a:6",
                                 'Track 8': "-map 0:a:7",
                                 'Track 9': "-map 0:a:8"}
    elif ffprobeinfo[-2] == '10':
        acodec_stream_choices = {'Track 1': "-map 0:a:0",
                                 'Track 2': "-map 0:a:1",
                                 'Track 3': "-map 0:a:2",
                                 'Track 4': "-map 0:a:3",
                                 'Track 5': "-map 0:a:4",
                                 'Track 6': "-map 0:a:5",
                                 'Track 7': "-map 0:a:6",
                                 'Track 8': "-map 0:a:7",
                                 'Track 9': "-map 0:a:8",
                                 'Track 10': "-map 0:a:9"}
    acodec_stream.set('Track 1')  # set the default option
    acodec_stream_label = Label(audio_window, text="Track :")
    acodec_stream_label.grid(row=0, column=0, columnspan=1, padx=5, pady=5)
    acodec_stream_menu = OptionMenu(audio_window, acodec_stream, *acodec_stream_choices.keys())
    acodec_stream_menu.grid(row=1, column=0, columnspan=1, padx=5, pady=5)


  


  This is all working great, If I am running the app via the .py file. Once I compile it's missing the entire defined dictionary selection.

  


  This is what it's supposed to look like
enter image description here

  


  However, this is what it looks like with the code above. enter image description here

  


  If I define the dictionary myself, it works fine. However, then I can't automatically input the correct amount of available audio tracks.

  


  I hope this isn't too much code. I'm very new at this.

  


  EDIT :

  


  If I compile via pyinstaller and remove the -w flag, the program runs correctly, shows the tracks.

  


  I'm assuming I'm not using subprocess/calling something correctly. The program I don't think is calling to FFPROBE when it doesn't have a console, vs calling it and getting the value when it has it's own console.