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• Python animation ffmpeg error - ValueError : I/O operation on closed file

  27 février 2018, par Rob

  I’m trying to follow this example here to do a simple animation : https://matplotlib.org/examples/animation/basic_example_writer.html

  I get this error :

  ValueError                                Traceback (most recent call last)
  
  /fsr/rfs07/ELEGANCE/work/code/python/s5p/animation_test.py in <module>()
  
       25 line_ani = animation.FuncAnimation(fig1, update_line, 25, fargs=(data, l),
  
       26                                    interval=50, blit=True)
  
  ---> 27 line_ani.save('lines.mp4', writer=writer)
  
       28 
  
  
  
       29 fig2 = plt.figure()
  
  
  
  /software/local/apps/python/2.7.9/lib/python2.7/site-packages/matplotlib/animation.pyc in save(self, filename, writer, fps, dpi, codec, bitrate, extra_args, metadata, extra_anim, savefig_kwargs)
  
     1061                         # TODO: See if turning off blit is really necessary
  
     1062                         anim._draw_next_frame(d, blit=False)
  
  -> 1063                     writer.grab_frame(**savefig_kwargs)
  
     1064 
  
     1065         # Reconnect signal for first draw if necessary
  
  
  
  /software/local/apps/python/2.7.9/lib/python2.7/contextlib.pyc in __exit__(self, type, value, traceback)
  
       33                 value = type()
  
       34             try:
  
  ---> 35                 self.gen.throw(type, value, traceback)
  
       36                 raise RuntimeError("generator didn't stop after throw()")
  
       37             except StopIteration, exc:
  
  
  
  /software/local/apps/python/2.7.9/lib/python2.7/site-packages/matplotlib/animation.pyc in saving(self, *args, **kw)
  
      287             yield self
  
      288         finally:
  
  --> 289             self.finish()
  
      290 
  
      291     def _run(self):
  
  
  
  /software/local/apps/python/2.7.9/lib/python2.7/site-packages/matplotlib/animation.pyc in finish(self)
  
      307     def finish(self):
  
      308         'Finish any processing for writing the movie.'
  
  --> 309         self.cleanup()
  
      310 
  
      311     def grab_frame(self, **savefig_kwargs):
  
  
  
  /software/local/apps/python/2.7.9/lib/python2.7/site-packages/matplotlib/animation.pyc in cleanup(self)
  
      346     def cleanup(self):
  
      347         'Clean-up and collect the process used to write the movie file.'
  
  --> 348         out, err = self._proc.communicate()
  
      349         self._frame_sink().close()
  
      350         verbose.report('MovieWriter -- '
  
  
  
  /software/local/apps/python/2.7.9/lib/python2.7/site-packages/subprocess32.pyc in communicate(self, input, timeout)
  
      925 
  
      926         try:
  
  --> 927             stdout, stderr = self._communicate(input, endtime, timeout)
  
      928         finally:
  
      929             self._communication_started = True
  
  
  
  /software/local/apps/python/2.7.9/lib/python2.7/site-packages/subprocess32.pyc in _communicate(self, input, endtime, orig_timeout)
  
     1711             if _has_poll:
  
     1712                 stdout, stderr = self._communicate_with_poll(input, endtime,
  
  -> 1713                                                              orig_timeout)
  
     1714             else:
  
     1715                 stdout, stderr = self._communicate_with_select(input, endtime,
  
  
  
  /software/local/apps/python/2.7.9/lib/python2.7/site-packages/subprocess32.pyc in _communicate_with_poll(self, input, endtime, orig_timeout)
  
     1767             select_POLLIN_POLLPRI = select.POLLIN | select.POLLPRI
  
     1768             if self.stdout:
  
  -> 1769                 register_and_append(self.stdout, select_POLLIN_POLLPRI)
  
     1770                 stdout = self._fd2output[self.stdout.fileno()]
  
     1771             if self.stderr:
  
  
  
  /software/local/apps/python/2.7.9/lib/python2.7/site-packages/subprocess32.pyc in register_and_append(file_obj, eventmask)
  
     1746             poller = select.poll()
  
     1747             def register_and_append(file_obj, eventmask):
  
  -> 1748                 poller.register(file_obj.fileno(), eventmask)
  
     1749                 self._fd2file[file_obj.fileno()] = file_obj
  
     1750 
  
  
  
  ValueError: I/O operation on closed file
  
  </module>

  ffmpeg on it’s own outside of python seems to work ok so I’m not really sure how to get this working ?

  I’ve tried using imagemagick as an alternative

  e.g.
  line_ani.save(’lines.gif’, writer=’imagemagick’)

  but this results in the gif jumping around between frames

  

• Pass options containing spaces to ffmpeg using fluent-ffmpeg

  10 janvier 2019, par dansumption

  I am writing a Node script which copies and re-tags some of my MP4 files using fluent-ffmpeg

  It doesn’t work with any metadata that contains spaces. The code that does the copying/tagging looks something like this :

  const ffmpeg = require('fluent-ffmpeg');
  
  
  
  const inputFilename = 'path/to/original.m4a';
  
  const outputFilename = 'path/to/new.m4a';
  
  
  
  const options = [
  
      '-metadata', 'artist=Someone',
  
      '-metadata', 'album=Some title',
  
      // ...etc
  
  ];
  
  
  
  ffmpeg(inputFilename)
  
    .outputOptions(options)
  
    .saveToFile(outputFilename);

  This results in an error :

  events.js:183
  
        throw er; // Unhandled 'error' event
  
  
  
  An error occurred: ffmpeg exited with code 1: title: Invalid argument

  I have tried putting Some title in single quotes, double quotes and no quotes. I have tried escaping the spaces in it. I have tried passing the options array as single options rather than tuples, for example : '-metadata album="Some title"' - but whatever I try, it still throws an error when there are spaces.

  (It may be relevant to note that this is on Windows)

  Can anyone suggest a way of getting it to work ?

• outOfMemoryError from javacv

  14 février 2018, par Maharjun M

  We are using javacv library for creating thumbnails out of videos. We are able to create thumbnails. But when we upload more videos (20 to 30 of 10MB to 40MB) the application is throwing outOfMemoryError.

  We are using 1.3.1 version of javacv.
  Here is the pom.xml file.

      <dependency>
  
          <groupid>org.bytedeco</groupid>
  
          <artifactid>javacv</artifactid>
  
          <version>1.3.1</version>
  
      </dependency>

  Here is the code

  public BufferedImage generateThumbnail(File outputVideoFile) throws IOException {
  
        BufferedImage bufferedImage = null;
  
      try {
  
          FFmpegFrameGrabber frameGrabber = new FFmpegFrameGrabber(outputVideoFile);
  
          frameGrabber.start();
  
          Frame grabKeyFrame = frameGrabber.grabKeyFrame();
  
          Java2DFrameConverter java2DFrameConverter = new Java2DFrameConverter();
  
          bufferedImage = java2DFrameConverter.convert(grabKeyFrame);
  
          frameGrabber.stop();
  
      } catch (Exception e) {
  
          throw new RuntimeException(e);
  
      }
  
      return bufferedImage;
  
  }

  Here is the error

   java.lang.OutOfMemoryError: Physical memory usage is too high: physicalBytes = 3G > maxPhysicalBytes = 3G
  
  org.bytedeco.javacpp.Pointer.deallocator(Pointer.java:562)
  
  org.bytedeco.javacpp.Pointer.init(Pointer.java:121)
  
  org.bytedeco.javacpp.avcodec$AVPacket.allocate(Native Method)
  
  org.bytedeco.javacpp.avcodec$AVPacket.<init>(avcodec.java:1696)
  
  org.bytedeco.javacv.FFmpegFrameGrabber.startUnsafe(FFmpegFrameGrabber.java:471)
  
  org.bytedeco.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:462)
  
  org.bahmni.module.bahmnimsf.extension.PatientDocumentThumbnailGenerator.generateThumbnail(PatientDocumentThumbnailGenerator.java:40)
  
  org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:961)
  
  </init>

  I tried to upgrade the version to 1.4 though it’s not working.
  Somebody told me to use System.gc() that also not working.

  Can someone suggest the solution ? thanks in advance.