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• Compile FFmpeg with a new encoder

  19 octobre 2015, par Richard Mc

  I have be sent a encoder and I need to compile with FFMPEG, I am new to this so I’m not sure how to add/compile it with ffmpeg. The encoder is JSV, my server is ubuntu 14.04.

  I have started to read this https://ffmpeg.org/developer.html#New-codecs-or-formats-checklist but am unsure about what to do.

• Can't merge mp4 files with FFmpeg on android

  6 mai 2017, par Brian

  I’m using https://github.com/hiteshsondhi88/ffmpeg-android-java in an app that needs to combine multiple mp4 files into one.

  Here is a command

  ffmpeg -i concat:"/data/data/com.testapp.app/cache:temp/lds82df9skov65i15k3ct16cik.mp4|/data/data/com.testapp.app/cache:temp/qm5s0utmb8c1gbhch6us2tnilo.mp4" -codec copy /data/data/com.testapp.app/cache:temp/4egqalludvs03tnfleu5dgb6iv.mp4

  java method to append files, movie files is an array holding files i want to combine

  public void appendFiles() {
  
  
  
      showProgressDialog();
  
  
  
      movieFile = getRandomFile();
  
  
  
      StringBuilder b = new StringBuilder();
  
  
  
      try {
  
  
  
          for (int i = 0; i < movieFiles.size(); i++) {
  
  
  
              File f = movieFiles.get(i);
  
  
  
              if (!f.exists()) {
  
                  continue;
  
              }
  
  
  
              if(i != 0){
  
                  b.append("|");
  
              }
  
  
  
              b.append(f.getPath());
  
  
  
  
  
          }
  
  
  
          final String command = "-i concat:\""+b.toString() + "\" -codec copy " + movieFile.getPath();
  
  
  
  
  
  
  
          try {
  
              ffmpeg.execute(command, new ExecuteBinaryResponseHandler() {
  
                  @Override
  
                  public void onFailure(String s) {
  
                      app.log("FAILED with output : " + s);
  
                  }
  
  
  
                  @Override
  
                  public void onSuccess(String s) {
  
                      app.log("SUCCESS with output : " + s);
  
  
  
                      createThumbnail();
  
  
  
                      stopProgressDialog();
  
  
  
                      startReview();
  
                  }
  
  
  
                  @Override
  
                  public void onProgress(String s) {
  
                      app.log("Started command : ffmpeg " + command);
  
  
  
                  }
  
  
  
                  @Override
  
                  public void onStart() {
  
  
  
                      app.log("Started command : ffmpeg " + command);
  
  
  
                  }
  
  
  
                  @Override
  
                  public void onFinish() {
  
                      app.log("Finished command : ffmpeg " + command);
  
  
  
                  }
  
              });
  
          }
  
          catch (FFmpegCommandAlreadyRunningException e) {
  
              e.printStackTrace();
  
          }
  
  
  
  
  
      }
  
  
  
      catch (Exception e) {
  
          e.printStackTrace();
  
      }
  
  
  
  }

  and getRandomFile()

      public File getRandomFile() {
  
          if (captureDir != null) {
  
              if (captureDir.exists()) {
  
  
  
                  SecureRandom random = new SecureRandom();
  
                  File file = new File(captureDir, new BigInteger(130, random).toString(32) + ".mp4");
  
                  return file;
  
              }
  
          }
  
          return null;
  
      }

  but I keep seeing the error no such file or directory

  concat :"/data/data/com.testapp.app/cache:temp/lds82df9skov65i15k3ct16cik.mp4|/data/data/com.testapp.app/cache:temp/qm5s0utmb8c1gbhch6us2tnilo.mp4" : No such file or directory

  any ideas ?

• Python matplotlib.animation [Errno 13] Permission denied

  11 février 2016, par Fishman

  I am trying to create a simple animated histogram and save it as a .mp4 using matplotlib and ffmpeg on a mac. I have already installed ffMpeg, specified the ffmpeg path, and now I am getting a permission denied error when writing to a folder in my desktop. I tried running as sudo and still get the same error. Help is much appreciated, thank you !

  Here is the code :

  df = pd.read_csv('.../data.csv')
  
  
  
  df = df.dropna()
  
  #Get list of weeks
  
  weeks = df.ot_date.unique()
  
  fig, ax = plt.subplots()
  
  
  
  data = df.intervals_filled[df['ot_date'].isin([weeks[0]])]
  
  n, bins = np.histogram( data , 20)
  
  
  
  # get the corners of the rectangles for the histogram
  
  left = np.array(bins[:-1])
  
  right = np.array(bins[1:])
  
  bottom = np.zeros(len(left))
  
  top = bottom + n
  
  nrects = len(left)
  
  
  
  # here comes the tricky part -- we have to set up the vertex and path
  
  # codes arrays using moveto, lineto and closepoly
  
  
  
  # for each rect: 1 for the MOVETO, 3 for the LINETO, 1 for the
  
  # CLOSEPOLY; the vert for the closepoly is ignored but we still need
  
  # it to keep the codes aligned with the vertices
  
  nverts = nrects*(1 + 3 + 1)
  
  verts = np.zeros((nverts, 2))
  
  codes = np.ones(nverts, int) * path.Path.LINETO
  
  codes[0::5] = path.Path.MOVETO
  
  codes[4::5] = path.Path.CLOSEPOLY
  
  verts[0::5, 0] = left
  
  verts[0::5, 1] = bottom
  
  verts[1::5, 0] = left
  
  verts[1::5, 1] = top
  
  verts[2::5, 0] = right
  
  verts[2::5, 1] = top
  
  verts[3::5, 0] = right
  
  verts[3::5, 1] = bottom
  
  
  
  barpath = path.Path(verts, codes)
  
  patch = patches.PathPatch(
  
      barpath, facecolor='green', edgecolor='yellow', alpha=0.5)
  
  ax.add_patch(patch)
  
  
  
  ax.set_xlim(left[0], right[-1])
  
  ax.set_ylim(bottom.min(), top.max()+40)
  
  ax.set_xlabel('Number of intervals/week')
  
  ax.set_ylabel('Count of CSAs')
  
  plt.rcParams['animation.ffmpeg_path'] = '/usr/local/Cellar/ffmpeg'
  
  FFwriter = animation.FFMpegWriter()
  
  
  
  def animate(i):
  
      print i
  
      # simulate new data coming in
  
      data = df.intervals_filled[df['ot_date'].isin([weeks[i-1]])]
  
      n, bins = np.histogram(data, 20)
  
      yearweek = str(weeks[i-1])
  
      year = yearweek[0:4]
  
      week = yearweek[4:]
  
      title = 'Week %(wk)s of %(yr)s' %{'wk': week, 'yr': year}
  
      ax.set_title(title)
  
      top = bottom + n
  
      verts[1::5, 1] = top
  
      verts[2::5, 1] = top
  
      return [patch, ]
  
  
  
  ani = animation.FuncAnimation(fig, animate, 53,interval=1000, repeat=False)
  
  ani.save('/Users/.../Desktop/1b.mp4', writer = FFwriter)
  
  plt.show()

  And here is the traceback :

  Traceback (most recent call last):
  
    File "/Users/Fishman1049/Desktop/reserves_histogram_timeline/python/1b_text.py", line 109, in <module>
  
      ani.save('/Users/Fishman1049/Desktop/1b', writer = FFwriter)
  
    File "/Users/Fishman1049/anaconda/lib/python2.7/site-packages/matplotlib/animation.py", line 761, in save
  
      with writer.saving(self._fig, filename, dpi):
  
    File "/Users/Fishman1049/anaconda/lib/python2.7/contextlib.py", line 17, in __enter__
  
      return self.gen.next()
  
    File "/Users/Fishman1049/anaconda/lib/python2.7/site-packages/matplotlib/animation.py", line 186, in saving
  
      self.setup(*args)
  
    File "/Users/Fishman1049/anaconda/lib/python2.7/site-packages/matplotlib/animation.py", line 176, in setup
  
      self._run()
  
    File "/Users/Fishman1049/anaconda/lib/python2.7/site-packages/matplotlib/animation.py", line 204, in _run
  
      creationflags=subprocess_creation_flags)
  
    File "/Users/Fishman1049/anaconda/lib/python2.7/subprocess.py", line 710, in __init__
  
      errread, errwrite)
  
    File "/Users/Fishman1049/anaconda/lib/python2.7/subprocess.py", line 1335, in _execute_child
  
      raise child_exception
  
  OSError: [Errno 13] Permission denied
  
  </module>

  I am running matplotlib version 1.5.1, just installed FFmpeg today using homebrew, spyder 2.3.8, python 2.7 and OS X 10.10.5. Thank you !.