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• avformat/dashenc : warn if Producer Reference Time element option is missing when...

  17 février 2020, par James Almer

  avformat/dashenc : warn if Producer Reference Time element option is missing when ldash mode is used
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavformat/dashenc.c

• "The system cannot find the file specified" when animating with ffmpeg in matplotlib

  27 novembre 2019, par algol

  I am trying to generate a movie from a stack of numpy arrays using a function I have used on a different computer (a mac) on my home computer (Windows 10). Here is the function that I am using :

  def make_animation(frames,name): 
  
  
  
      plt.rcParams['animation.ffmpeg_path'] = u'C:\ffmpeg-20190320-0739d5c-win64-static\bin\ffmpeg.exe' 
  
      n_images=frames.shape[2] 
  
      assert (n_images>1)   
  
      figsize=(10,10)
  
      fig, ax = plt.subplots(figsize=figsize)
  
      fig.tight_layout()
  
      fig.subplots_adjust(left=0, bottom=0, right=1, top=1, wspace=None, hspace=None)
  
      #lineR, = ax.plot(xaxis_data[0],R_data[0],'c-',label="resources")
  
      img = ax.imshow(frames[:,:,0], animated = True)   
  
  
  
  
  
      def updatefig(img_num): 
  
  
  
          #lineR.set_data(xaxis_data[img_num],R_data[img_num],'r-')
  
  
  
          img.set_data(frames[:,:,img_num])
  
  
  
          return [img]
  
  
  
  
  
      ani = animation.FuncAnimation(fig, updatefig, np.arange(1, n_images), interval=50, blit=True)
  
      mywriter = animation.FFMpegWriter(fps = 20)
  
      #ani.save('mymovie.mp4',writer=mywriter)
  
  
  
      ani.save(f"D:\{name}.mp4",writer=mywriter)
  
  
  
      plt.close(fig)

  Here is the error that I am getting :

  Traceback (most recent call last):
  
  
  
    File "", line 1, in <module>
  
      make_animation(stack,'full_test')
  
  
  
    File "", line 27, in make_animation
  
      ani.save(f"D:\{name}.mp4",writer=mywriter)
  
  
  
    File "C:\Users\~snip~\Anaconda3\lib\site-packages\matplotlib\animation.py", line 1136, in save
  
      with writer.saving(self._fig, filename, dpi):
  
  
  
    File "C:\Users\~snip~\Anaconda3\lib\contextlib.py", line 112, in __enter__
  
      return next(self.gen)
  
  
  
    File "C:\Users\~snip~\Anaconda3\lib\site-packages\matplotlib\animation.py", line 228, in saving
  
      self.setup(fig, outfile, dpi, *args, **kwargs)
  
  
  
    File "C:\Users\~snip~\Anaconda3\lib\site-packages\matplotlib\animation.py", line 352, in setup
  
      self._run()
  
  
  
    File "C:\Users\~snip~\Anaconda3\lib\site-packages\matplotlib\animation.py", line 363, in _run
  
      creationflags=subprocess_creation_flags)
  
  
  
    File "C:\Users\~snip~\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 143, in __init__
  
      super(SubprocessPopen, self).__init__(*args, **kwargs)
  
  
  
    File "C:\Users\~snip~\Anaconda3\lib\subprocess.py", line 775, in __init__
  
      restore_signals, start_new_session)
  
  
  
    File "C:\Users\~snip~\Anaconda3\lib\subprocess.py", line 1178, in _execute_child
  
      startupinfo)
  
  
  
  FileNotFoundError: [WinError 2] The system cannot find the file specified
  
  </module>

  I know this code basically works since I have used it before on another computer. My guess is that something about ffmpeg is messed up or something about the output path is wrong. I’m not sure what could be wrong with the ffmpeg since I definitely have it installed (via conda) and the path is pretty straightforward. On the other hand I’m not sure what could be wrong with the output path.

• ffmpeg - color-grading video material AND display original source as picture-in-picture, using -filter_complex

  5 octobre 2019, par raven

  this is my first post on this forum, so please be gentle in case I accidentally do trip over any forum rules that I would not know of yet :).

  I would like to apply some color-grading to underwater GoPro footage. To quicker gauge the effect of my color settings (trial-and-error, as of yet), would like to see the original input video stream as a PIP (e.g., scaled down to 50% or even 30%), in the bottom-right corner of the converted output movie.

  I have one input movie that is going to be color graded. The PIP should use the original as an input, just a scaled-down version of it.

  I would like to use ffmpeg’s "-filter_complex" option to do the PIP, but all examples I can find on "-filter_complex" would use two already existing movies. Instead, I would like to make the color-corrected stream an on-the-fly input to "-filter_complex", which then renders the PIP.

  Is that doable, all in one go ?

  Both the individual snippets below work fine, I now would like to combine these and skip the creation of an intermediate color-graded TMP output which then gets combined, with the original, in a final PIP creation process.
  Your help combining these two separate steps into one single "-filter_complex" action is greatly appreciated !

  Thanks in advance,
  raven.

  [existing code snippets (M$ batch files)]
  
  
  
  ::declarations/defines::
  
  set "INPUT="
  
  set "TMP="
  
  set "OUTPUT="
  
  set "FFMPG="
  
  set "QU=9" :: quality settings
  
  
  
  set "CONV='"0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 0 -1 0:0 -1 0 -1 5 -1 
  
  0 -1 0:0 -1 0 -1 5 -1 0 -1 0'"" :: sharpening convolution filter
  
  
  
  ::color-grading part::
  
  %FFMPG% -i %INPUT% -vf convolution=%CONV%,colorbalance=rs=%rs%:gs=%gs%:bs=%bs%:rm=%rm%:gm=%gm%:bm=%bm%:rh=%rh%:gh=%gh%:bh=%bh% -q:v %QU% -codec:v mpeg4 %TMP%
  
  
  
  ::PIP part::
  
  %FFMPG% -i %TMP% -i %INPUT% -filter_complex "[1]scale=iw/3:ih/3 
  
  [pip]; [0][pip] overlay=main_w-overlay_w-10:main_h-overlay_h-10" -q:v 
  
  %QU% -codec:v mpeg4 %OUTPUT%
  
  
  
  [/existing code]