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• compiling ffmpeg Ubuntu 16

  23 juin 2020, par retepik

  I am new on stackowerflow.

  



  I need a advice :)
I have tried compile ffmpeg 2.8.15 from source under Ubuntu 16 LTS. I need compile it for one SDK, I can't use ffmpeg from repository. I compiled ffmpeg successfully. But I have got issues with my specify SDK, when I try compile my code with SDK :

  



  SDK.so: undefined reference to `av_rescale_q@LIBAVUTIL_FFMPEG_54'


  



  I suppose that issues are in symbols name. I tried read symbols with

  



  readelf -s libavutil-ffmpeg.so.54


  



  I get in my compiled ffmpeg something like this

  



     158: 0000000000024170    55 FUNC    GLOBAL DEFAULT   12 av_rescale_q@@LIBAVUTIL_54


  



  I tried this with libavutil-ffmpeg.so.54 from repository and i get

  



     158: 0000000000024170    55 FUNC    GLOBAL DEFAULT   12 av_rescale_q@@LIBAVUTIL_FFMPEG_54


  



  I suppose that I need add a suffix "FFMPEG" to symbols name.
I use this configuration for build ffmpeg, it same as configuration of build from repository :

  



  sudo ./configure --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv


  



  Could you help how add suffix "-ffmpeg" to symbols name ?
Thanks

  



  Best Regard

  



  retepik

  


• ffmpeg fails to connect a second camera when run using python thread

  1er juin 2023, par LemonJumps

  I'm starting ffmpeg dshow -> rawvideo over pipe in python thread, see code below

  


      def run(self):
        proc = subprocess.Popen(
            [FFMPEG_DIR + "ffmpeg", "-hide_banner", "-f", "dshow", 
                "-video_size", str(self.resolution[0]) + "x" + str(self.resolution[1]), # select resolution
                "-framerate", str(self.framerate), # select framerate
                "-i", "video=" + self.device, # select device
                "-f", "rawvideo", "-pix_fmt", "bgr24", "pipe:"], # output to pipe
            stdout = subprocess.PIPE)
        
        buf = b''
        
        while True:
            outs = proc.stdout.read(self.resolution[0] * self.resolution[1] *3)
            buf += outs
            
            if len(buf) >= (self.resolution[0] * self.resolution[1] *3):
                with self.lock:
                    self.frame = buf[0:self.resolution[0] * self.resolution[1] *3] 
                    self.cnt += 1
                    
                buf = b''
                
            if self.endEvent.isSet():
                proc.kill()
                return


  


  I am using alternative name as camera name, both cameras are the same model.
both devices name and alternative name :

  


  ('ACR010 USB Webcam', '@device_pnp_\\\\?\\usb#vid_0c45&pid_636a&mi_00#8&83c432e&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\\global')

  


  ('ACR010 USB Webcam', '@device_pnp_\\\\?\\usb#vid_0c45&pid_636a&mi_00#8&34de11d9&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\\global')

  


  when I run this code for each camera individually it works flawlessly.
But when I run this for both cameras at the same time, the code results this error :


  


  The "Could not run graph" sounds like ffmpeg can't open multiple devices, or isn't allowed by windows, or maybe there's a token that gets reused because it's all within a single process ?

  


  What could be really causing this error and how can I mitigate it ?

  


• Higher resolution (720p1080p) pytube video donot have sound. how to do with ffmpeg and with other sources exactly

  24 février 2021, par vishnu kumar

  i have taken url and res= 1080p from other function and with the help of template home.html.

  


  def download_complete(request, res) :

  


  global url


try:
    path = YouTube(url).streams.filter(res=res).first().download()

    response=FileResponse(open(out, 'rb'), as_attachment=True)

    return response

except Exception as ex:
    print('[complete] Exception:', ex)
    return render(request, 'error.html', {'url': url, 'error': ex})