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• Some modifications for ffmpeg scripts

  21 mars 2021, par FoxFr

  I wish to modify the following script to put some options, obviously if you can explain ... is better my learning

  


  ffmpeg \
-i /dev/video0 \
-r 1 -stream_loop -1 -f image2 -i "/home/pi/videopi/map/map.jpg" \
-stream_loop -1 -re -i "/home/pi/videopi/bed.mp3" \
-filter_complex "[0][1]overlay=enable='lt(mod(t,20),10)'[v];[v]drawtext=textfile=/home/pi/videopi/gps.txt:reload=1:x=30:y=350:fontfile=/usr/share/fonts/truetype/lato/Lato-Black.ttf:fontsize=30:fontcolor=white[v]" \
-map "[v]" \
-map 2:a \
-c:v libx264 -b:v 4000k -maxrate 4000k -bufsize 8000k -g 50 -c:a aac \
-s 640x480 \
-f flv rtmp://a.rtmp.youtube.com/live2/[google_key_stream]


  


  My desired customization :

  


  

  • Add an another webcam (-i /dev/video1) : 30" video0 -> 30" video1 -> 10" image2 -> 30" video0 ... (a loop)

  


  • Add a png overlay on the final comp

  


  • how add a transparent png behind the text

  


  • plug an audio input (by jack) to add over the bed.mp3

  


  • save the file in same time of live (-f flv live.mp4 ??)

  


  


  The part -filter_complex is the most difficult for me to understand

  


  Thanks you very much for you help, it's for finish my personal and important project

  


• Is every instance of subprocess.Popen() its own shell ?

  26 avril 2021, par saa-sof

  Background :
I'm trying to make an application that plays music via a GUI (Tkinter), Youtube_DL and FFmpeg. While the actual application is done it also requires FFmpeg to be an environment variable to work. Now, I'm trying to foolproof the creation of a "personal" FFmpeg environment variable in order to make the application portable (the last step is using pyinstaller to make a .exe file).

  


  Problem :
I'm trying to create the environment variable for FFmpeg by passing SET through subprocess.Popen :

  


  add_ffmpeg = subprocess.Popen(f"IF EXIST {path2set} SET PATH=%PATH%;{path2set}", shell=True)


  


  When I try to echo %PATH% (with Popen) the FFmpeg variable that should be present, is not. I just need to know whether or not I'm wasting my time with SET and should instead be using SETX or perhaps some other solution, I'm open to being told I did this all wrong.

  


  Relevant Code :

  


  # get any sub-directory with ffmpeg in it's name
ffmpeg = glob(f"./*ffmpeg*/")

# proceed if there is a directory
if len(ffmpeg) > 0:
    # double-check directory exists
    ffmpeg_exist = path.isdir(ffmpeg[0])

    if ffmpeg_exist:
        print("FFmpeg: Found -> Setting Up")
        
        # get the absolute path of the directories bin folder ".\ffmpeg-release-essentials.zip\bin"
        path2set = f"{path.abspath(ffmpeg[0])}\\bin\\"
        
        # add path of directory to environment variables
        add_ffmpeg = subprocess.Popen(f"IF EXIST {path2set} SET PATH=%PATH%;{path2set}", shell=True)
        add_ffmpeg.wait()
        
        # print all of the current environment variables
        list_vars = subprocess.Popen("echo %PATH%", shell=True)
        list_vars.wait()

else:
    print("FFmpeg: Missing -> Wait for Download...")
    
    # download the ffmpeg file via direct link
    wget.download("https://www.gyan.dev/ffmpeg/builds/ffmpeg-release-essentials.zip")
    
    # unzip the file
    powershell = subprocess.Popen("powershell.exe Expand-Archive -Path './ffmpeg-release-essentials.zip' "
                                  "-DestinationPath './'")
    powershell.wait()

    # remove the file
    remove("./ffmpeg-release-essentials.zip")

    # get any sub-directory with ffmpeg in it's name
    ffmpeg = glob("./*ffmpeg*/")

    # double-check directory exists
    ffmpeg_exist = path.isdir(ffmpeg[0])
    
    # proceed with if it exists
    if ffmpeg_exist:
        print("FFmpeg: Found -> Setting Up")
        
        # get the absolute path of the directories bin folder ".\ffmpeg-release-essentials.zip\bin"
        path2set = f"{path.abspath(ffmpeg[0])}\\bin\\"
        
        # add path of directory to environment variables
        add_ffmpeg = subprocess.Popen(f"IF EXIST {path2set} SET PATH=%PATH%;{path2set}", shell=True)
        add_ffmpeg.wait()

        # print all of the current environment variables
        list_vars = subprocess.Popen("echo %PATH%", shell=True)
        list_vars.wait()
        
    else:
        print("Something unexplained has gone wrong.")
        exit(0)


  


• How to compress base64 decoded video data using ffmpeg in django

  23 mai 2021, par Sudipto Sarker

  I want to upload the video/audio file in my django-channels project. So I uploaded video(base64 encoded url) from websocket connection. It is working fine. But now after decoding base64 video data I want to compress that video using ffmpeg.But it showing error like this.
''Raw : No such file or directory''
I used 'AsyncJsonWebsocketConsumer' in consumers.py file.Here is my code :
consumers.py :

  


  async def send_file_to_room(self, room_id, dataUrl, filename):
        # decoding base64 data
        format, datastr = dataUrl.split(';base64,')
        ext = format.split('/')[-1]
        file = ContentFile(base64.b64decode(datastr), name=filename)
        print(f'file: {file}')
        # It prints 'Raw content'
        output_file_name = filename + '_temp.' + ext
        ff = f'ffmpeg -i {file} -vf "scale=iw/5:ih/5" {output_file_name}'
        subprocess.run(ff,shell=True) 


  


  May be here ffmpeg can not recognize the file to be compressed. I also tried to solve this using post_save signal.

  


  signals.py :

  


  @receiver(post_save, sender=ChatRoomMessage)
def compress_video_or_audio(sender, instance, created, **kwargs):
    print("Inside signal")
    if created:
        if instance.id is None:
            print("Instance is not present")
        else:
            video_full_path = f'{instance.document.path}'
            print(video_full_path)
   // E:\..\..\..\Personal Chat Room\media\PersonalChatRoom\file\VID_20181219_134306_w5ow8F7.mp4
            output_file_name = filename + '_temp.' + extension
            ff = f'ffmpeg -i {filename} -vf "scale=iw/5:ih/5" {output_file_name}'
            subprocess.run(ff,shell=True)
            instance.document = output_file_name
            instance.save()


  


  It is also causing "E :..\Django\New_Projects\Personal : No such file or directory".
How can I solve this issue ? Any suggetions.It will be more helpful if it can be compressed before saving the object in database. Thanks in advance.