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• 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.

  


• Is ffmpeg able to read ArrayBuffer input from stream

  7 juillet 2017, par jAndy

  I want to accomplish the following tasks :

  • Record Video+Audio from any HTML5 (MediaStream) capable browser
  • Send that data via WebSocket as Blob / ArrayBuffer chunks to a server
  • Broadcast that input stream-data to multiple clients

  As it turns out, this brought me into a world of pain. The first task is fairly simple using the HTML5 MediaStream objects alongside WebSockets.

  // ... for simplicity...
  
  navigator.mediaDevices.getUserMedia({ audio: true, video: true }).then(stream => {
  
      let mediaRecorder = new MediaRecorder( stream );
  
      // ...
  
      mediaRecorder.ondataavailable = e => {
  
          webSocket.send( 'newVideoData', e.data ); // configured for binary data
  
      };
  
  });

  Now, I want to receive those data fragments and stream those via nginx vod module, because I guess I want the output stream in HLS or DASH.
  I could write a little nodejs script as backend, which just receives the binary chunks and write them to a file or stream, and just reference it so nginx vod module could possibly read it and create the m3u8 manifest on the fly ?

  I am wondering now,

  • if ffmpeg is able to read that binary data directly (should be webm format), without a man-in-the-middle script, "somehow" ?
  • If not, do I have to write the data down into a file and pass that as input to ffmpeg or can I (should I) pipe the data to a self spawned ffmpeg instance ? (if so, how ?)
  • Do I actually need the nginx server (probably alongside rtmp module) to deliver the output stream as HLS or could I just use ffmpeg to also create a dynamic manifest ?
  • Is the nginx vod module capable of creating a dynamic hls/dash manifest or must the input data be complete beforehand ?
  • Ultimately, am I on the totally wrong track here ? :P

  Actually I just want to create a little video-live-chat demo, without any plugins or 3rd party encoding software, pure browser.

• Cannot Compile FFMPEG with libfreetype on Windows/Msys2

  10 octobre 2024, par Devin Dixon

  I am having issues compiling ffmpeg with libfreetype with this commmand on windows MSYS2 :

  


  ./configure     --pkg-config-flags="--static" --enable-libvpl  --enable-libopenh264     --enable-version3  --enable-libfreetype    --enable-libopus     --enable-libvpx     --enable-libvorbis     --enable-libaom     --enable-libdav1d     --disable-gpl     --disable-w32threads     --enable-pthreads     --disable-shared     --enable-static     --extra-cflags='--static'   --extra-cflags="-I/mingw64/include -static"   --extra-ldflags="-L/mingw64/lib -static" --prefix="/home/compiled"


  


  I keep getting this error :

  


  ERROR: freetype2 not found using pkg-config

If you think configure made a mistake, make sure you are using the latest
version from Git.  If the latest version fails, report the problem to the
ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.libera.chat.
Include the log file "ffbuild/config.log" produced by configure as this will help
solve the problem.


  


  I've installed freetype with this command :

  


   pacman -Ss mingw-w64-x86_64-freetype


  


  I've also tried compiling freetype2 from the source :

  


  git clone https://git.savannah.gnu.org/git/freetype/freetype2.git

cd freetype2

mkdir build && cd build

/mingw64/bin/cmake .. -G "MSYS Makefiles" -DBUILD_SHARED_LIBS=OFF -DCMAKE_INSTALL_PREFIX=/mingw64

make

make install


  


  And pkg-config gives this :

  


  pkg-config freetype2 --cflags --libs
-IC:/msys64/mingw64/include/freetype2 -IC:/msys64/mingw64/include/harfbuzz -IC:/msys64/mingw64/include/glib-2.0 -IC:/msys64/mingw64/lib/glib-2.0/include -IC:/msys64/mingw64/include/libpng16 -lfreetype


  


  I can confirm the package is there :

  


  ls /mingw64/lib/pkgconfig/freetype2.pc
/mingw64/lib/pkgconfig/freetype2.pc


  


  Is there anything else I should be doing to compile a static version of ffmpeg with this package ?