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• how to copy mp4 file generated by FFMPEG spawn using another FFMPEG spawn

  2 mai 2021, par Abadi

  I am using the following code that records screen on Linux and the output is an mp4 file.

  


  const transcodeStreamToOutput = spawn('ffmpeg',[
'-hide_banner',
'-loglevel', 'error',
// disable interaction via stdin
'-nostdin',
// screen image size
'-s', `${BROWSER_SCREEN_WIDTH}x${BROWSER_SCREEN_HEIGHT}`,
// video frame rate
'-r', `${VIDEO_FRAMERATE}`,
// hides the mouse cursor from the resulting video
'-draw_mouse', '0',
// grab the x11 display as video input
'-f', 'x11grab',
    '-i', `${DISPLAY}`,
// grab pulse as audio input
'-f', 'pulse',
    '-ac', '2',
    '-i', 'default',
// codec video with libx264
'-c:v', 'libx264',
    '-pix_fmt', 'yuv420p',
    '-profile:v', 'main',
    '-preset', 'veryfast',
    '-x264opts', 'nal-hrd=cbr:no-scenecut',
    '-minrate', `${VIDEO_BITRATE}`,
    '-maxrate', `${VIDEO_BITRATE}`,
    '-g', `${VIDEO_GOP}`,
// apply a fixed delay to the audio stream in order to synchronize it with the video stream
'-filter_complex', 'adelay=delays=1000|1000',
// codec audio with aac
'-c:a', 'aac',
    '-b:a', `${AUDIO_BITRATE}`,
    '-ac', `${AUDIO_CHANNELS}`,
    '-ar', `${AUDIO_SAMPLERATE}`,
// adjust fragmentation to prevent seeking(resolve issue: muxer does not support non seekable output)
'-movflags', 'frag_keyframe+empty_moov',
// set output format to mp4 and output file to stdout
'-f', 'mp4', '-'
]


  


  ) ;

  


  I need to run ffmpeg -i captured.mp4 -c copy new.mp4 using another spawn process on the output.
I tried the following :

  


  const newStdOut =  spawn('ffmpeg',[

    '-i', `${transcodeStreamToOutput.stdout}`, 
    '-codec:v', 'copy', 
    '-codec:a', 'copy', 
    '-f', 'mp4', '-'
    ]
);


  


  But it is not working. I would appreciate any help.

  


• Permission denied for openFileDescriptor to pass a file from SDCARD to FFmpeg

  15 février 2020, par 1234567

  Permission denied for openFileDescriptor to pass a file from SDCARD to FFmpeg

  I am trying to work with a file from Sdcard which is to be passed to FFmpeg fro this I am using

   Uri contentUri = ContentUris.withAppendedId(
  
              MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
  
              cursor.getLong(Integer.parseInt(BaseColumns._ID)));
  
      String fileOpenMode = "r";
  
      ParcelFileDescriptor parcelFd =
  
              resolver.openFileDescriptor(contentUri, fileOpenMode);
  
      if (parcelFd != null) {
  
          int fd = parcelFd.detachFd();
  
          // Pass the integer value "fd" into your native code. Remember to call
  
          // close(2) on the file descriptor when you're done using it.
  
      }
  
  
  
  int pid = android.os.Process.myPid();
  
              String mediaFile = "/proc/" + pid + "/fd/" + fd;
  
  
  
              Toast.makeText(videoexample.this, "mediafile" + mediaFile, Toast.LENGTH_SHORT).show();
  
  
  
              //File directoryToStore = videoexample.this.getExternalFilesDir("tempDirectory");
  
              File directoryToStore = videoexample.this.getExternalFilesDir("tempDirectory");
  
              if(directoryToStore != null) {
  
                  if (!directoryToStore.exists()) {
  
                      if (directoryToStore.mkdir()) ; //directory is created;
  
                  }
  
              }
  
  
  
  
  
              // Output path passed to FFmpeg
  
              String outputPath = directoryToStore+"/testFile.mp4";
  
  
  
              int rc = FFmpeg.execute("-y -i "+mediaFile+" -filter:v scale=1280:720 -c:a copy "+outputPath);

  If this file is present in the SDCard , It gives me an error

  E/mobile-ffmpeg: /proc/20124/fd/169: Permission denied in the logcat

  however if the file is from Internal (phone’s ) storage it works fine

  all the permissions are given , I am trying it on a Moto C android 7.0

  any help would be useeful

• Matplotlib can not save animation

  1er avril 2020, par Justin Furuness

  I have a matplotlib animation and it will not save. If I do not save it, it runs totally fine and without error. When I try to save it errors with a message that is not helpful. I have googled this error and checked everything, but I cannot seem to find an answer to this problem. I have installed ffmpeg. Am I doing something wrong that is obvious ? I am running on ubuntu 19.10 with matplotlib 3.2.1 if that matters.

  



  The code to save the animation is below :

  



      def run_animation(self, total_rounds):
        anim = animation.FuncAnimation(self.fig, self.animate,
                                       init_func=self.init,
                                       frames=total_rounds * 100,
                                       interval=40,
                                       blit=True)
#        Writer = animation.writers['ffmpeg']
#        writer = Writer(fps=15, metadata=dict(artist='Me'), bitrate=1800)
        anim.save('animation.mp4')


  



  The error traceback :

  



  2020-04-01 02:20:58,279-INFO: MovieWriter._run: running command: ffmpeg -f rawvideo -vcodec rawvideo -s 1200x500 -pix_fmt rgba -r 25.0 -loglevel error -i pipe: -vcodec h264 -pix_fmt yuv420p -y animation.mp4
Traceback (most recent call last):
  File "/home/anon/.local/lib/python3.7/site-packages/matplotlib/backend_bases.py", line 2785, in _wait_cursor_for_draw_cm
    self.set_cursor(cursors.WAIT)
  File "/home/anon/.local/lib/python3.7/site-packages/matplotlib/backends/backend_gtk3.py", line 468, in set_cursor
    self.canvas.get_property("window").set_cursor(cursord[cursor])
AttributeError: 'NoneType' object has no attribute 'set_cursor'


  



  Thanks a million for your help