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• Glitchy mp4 File saved with Matplotlib Animation via ffmpeg

  9 janvier 2024, par Jacob Ivanov

  I am attempting to save an .mp4 file using matplotlib.animation to output some simulation results. The relevent section is as follows :

  


  ANI = FuncAnimation(fig, update, init_func = lambda : None, frames = range(0, 21300, 50))
ANI.save("[removed]/anim/v6 256 unforced 0.02.mp4", dpi = 600, fps = 30, writer = 'ffmpeg')


  


  However, it appears that there is some issue in the produced .mp4 file, as when I use macOS Quicktime to view the file, it pauses on certain frames, and restarts later on. It appears to consistently pause on the same frame a few seconds in. In order to check if Quicktime was the problem, I opened some random .mp4 files I found in a family group chat, and did not have this issue.

  


  I also tried viewing this .mp4 file with VLC, which had no issue, and played without any glitches. The Slack media viewer built into the app pauses similar to Quicktime.

  


  The following are all relevant versions :

  


  

  • macOS : 14.2.1 (23C71)

  


  • Python : 3.10.9 via Homebrew

  


  • Matplotlib : 3.6.2

  


  • ffmpeg : 6.1.1

  


  


  If it would help, I can also provide the .mp4 file itself, but I'm not quite sure how to upload it. I will be happy to provide any additional information as well.

  


  Unfortunately, I'm not very familiar with video rendering, but I would appreciate any help anyone could provide. Thank you in advance !

  


• Rails using stremio-ffmpeg gem to watermark a movie while uploading

  16 juin 2016, par Felix

  I am using carrierwave to upload a movie to amazon s3 that works perfect.

  Now I want to add a watermark to the movie while uploading or after uploading, I don’t know, what’s the best way ?

  I tried this :

  movie_controller.rb action uploadVideo

  movie = FFMPEG::Movie.new(@vid.video.url)
  
  
  
  puts "........................................"
  
  puts movie.inspect
  
  
  
  if @vid.save

  Just to find out if the video is catched from stremio.

  But then I got the error that the movie is not found, the problem is that it doesn’t look in the amazon s3 bucket, it looks on my local server

  No such file or directory - the file '/uploads/tmp/1462954331-3471-8766/VID-20160424-WA0013.mp4' does not exist

  What could be the solution ? or should I do this in carrierwave uploader ?

  UPDATE :

  When I do this after the .save action it looks at amazon s3 bucket .. but also says that the movie isn’t there. But if I call it directly in browser it’s displayed.

  UPDATE Code :

  #Laedt ein Video hoch
  
  def uploadMovie
  
    @user = User.find_by_id session[:user_id]
  
    #Holt alle Channels für die er eine Berechtigung hat (Eingeloggter user)
  
    @user = User.find_by_id session[:user_id]
  
    @knowledgeproviderList = @user.knowledgeprovider
  
    @channels = Channel.where(knowledgeprovider_id:     @knowledgeproviderList.pluck(:id))
  
    @vid = Movie.new(movies_params)
  
    @channel = Channel.find(params[:vid][:channel_id])
  
    @vid.channel = @channel
  
  
  
    #Fügt dem Movie einen Tag hinzu
  
    createTag params
  
    createCategory params
  
  
  
  
  
  
  
    if @vid.save
  
      flash[:notice] = t("flash.saved")
  
  
  
      #movie = FFMPEG::Movie.new(@vid.video.url)
  
  
  
      #puts "........................................"
  
      #puts movie.inspect
  
  
  
      redirect_to :action => :add
  
     else
  
       redirect_to :action => :add
  
    end
  
   end

  Update error :

  movie = FFMPEG::Movie.new(@vid.video.current_path)
  
  
  
  options = {watermark: "mages/header.png", resolution: "640x360", watermark_filter: { position: "RT", padding_x: 10, padding_y: 10 } }
  
  movie.transcode("movie.flv", options)

  

  Update :
  Added the code in the uploader :

    process :watermark_movie
  
  
  
       def watermark_movie
  
         if self.file.path
  
               options = {watermark: "images/header.png", resolution: "640x360", watermark_filter: { position: "RT", padding_x: 10, padding_y: 10 } }
  
               self.model.file = FFMPEG::Movie.new(self.file.path).transcode("#{root}/#{cache_dir}/#{self.cache_id}/file.mp4", options)
  
          end
  
        end

  Error :

  multi_json (1.12.0) lib/multi_json/adapter.rb:19:in `load'
  
  multi_json (1.12.0) lib/multi_json.rb:122:in `load'
  
  streamio-ffmpeg (2.0.0) lib/ffmpeg/movie.rb:28:in `initialize'
  
  app/uploaders/movie_uploader.rb:40:in `new'
  
  app/uploaders/movie_uploader.rb:40:in `watermark_movie'
  
  carrierwave (0.11.2) lib/carrierwave/uploader/processing.rb:84:in `block in process!'
  
  carrierwave (0.11.2) lib/carrierwave/uploader/processing.rb:76:in `each'
  
  carrierwave (0.11.2) lib/carrierwave/uploader/processing.rb:76:in `process!'
  
  carrierwave_backgrounder (0.4.2) lib/backgrounder/delay.rb:14:in `process!'
  
  carrierwave (0.11.2) lib/carrierwave/uploader/callbacks.rb:18:in `block in with_callbacks'
  
  carrierwave (0.11.2) lib/carrierwave/uploader/callbacks.rb:18:in `each'
  
  carrierwave (0.11.2) lib/carrierwave/uploader/callbacks.rb:18:in `with_callbacks'
  
  carrierwave (0.11.2) lib/carrierwave/uploader/cache.rb:134:in `cache!'
  
  carrierwave (0.11.2) lib/carrierwave/mount.rb:329:in `cache'
  
  carrierwave (0.11.2) lib/carrierwave/mount.rb:163:in `video='
  
  carrierwave (0.11.2) lib/carrierwave/orm/activerecord.rb:39:in `video='
  
  activerecord (4.2.1) lib/active_record/attribute_assignment.rb:54:in `public_send'
  
  activerecord (4.2.1) lib/active_record/attribute_assignment.rb:54:in `_assign_attribute'
  
  activerecord (4.2.1) lib/active_record/attribute_assignment.rb:41:in `block in assign_attributes'
  
  actionpack (4.2.1) lib/action_controller/metal/strong_parameters.rb:183:in `each_pair'
  
  actionpack (4.2.1) lib/action_controller/metal/strong_parameters.rb:183:in `each_pair'
  
  activerecord (4.2.1) lib/active_record/attribute_assignment.rb:35:in `assign_attributes'
  
  activerecord (4.2.1) lib/active_record/core.rb:559:in `init_attributes'
  
  activerecord (4.2.1) lib/active_record/core.rb:281:in `initialize'
  
  activerecord (4.2.1) lib/active_record/inheritance.rb:61:in `new'
  
  activerecord (4.2.1) lib/active_record/inheritance.rb:61:in `new'
  
  app/controllers/movies_controller.rb:71:in `uploadMovie'
  
  actionpack (4.2.1) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
  
  actionpack (4.2.1) lib/abstract_controller/base.rb:198:in `process_action'
  
  actionpack (4.2.1) lib/action_controller/metal/rendering.rb:10:in `process_action'
  
  actionpack (4.2.1) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
  
  activesupport (4.2.1) lib/active_support/callbacks.rb:117:in `call'
  
  activesupport (4.2.1) lib/active_support/callbacks.rb:117:in `call'
  
  activesupport (4.2.1) lib/active_support/callbacks.rb:555:in `block (2 levels) in compile'
  
  activesupport (4.2.1) lib/active_support/callbacks.rb:505:in `call'
  
  activesupport (4.2.1) lib/active_support/callbacks.rb:505:in `call'
  
  activesupport (4.2.1) lib/active_support/callbacks.rb:92:in `_run_callbacks'
  
  activesupport (4.2.1) lib/active_support/callbacks.rb:776:in `_run_process_action_callbacks'
  
  activesupport (4.2.1) lib/active_support/callbacks.rb:81:in `run_callbacks'
  
  actionpack (4.2.1) lib/abstract_controller/callbacks.rb:19:in `process_action'
  
  actionpack (4.2.1) lib/action_controller/metal/rescue.rb:29:in `process_action'
  
  actionpack (4.2.1) lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
  
  activesupport (4.2.1) lib/active_support/notifications.rb:164:in `block in instrument'
  
  activesupport (4.2.1) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
  
  activesupport (4.2.1) lib/active_support/notifications.rb:164:in `instrument'
  
  actionpack (4.2.1) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
  
  actionpack (4.2.1) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
  
  activerecord (4.2.1) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
  
  actionpack (4.2.1) lib/abstract_controller/base.rb:137:in `process'
  
  actionview (4.2.1) lib/action_view/rendering.rb:30:in `process'
  
  actionpack (4.2.1) lib/action_controller/metal.rb:196:in `dispatch'
  
  actionpack (4.2.1) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
  
  actionpack (4.2.1) lib/action_controller/metal.rb:237:in `block in action'
  
  actionpack (4.2.1) lib/action_dispatch/routing/route_set.rb:74:in `call'
  
  actionpack (4.2.1) lib/action_dispatch/routing/route_set.rb:74:in `dispatch'
  
  actionpack (4.2.1) lib/action_dispatch/routing/route_set.rb:43:in `serve'
  
  actionpack (4.2.1) lib/action_dispatch/journey/router.rb:43:in `block in serve'
  
  actionpack (4.2.1) lib/action_dispatch/journey/router.rb:30:in `each'
  
  actionpack (4.2.1) lib/action_dispatch/journey/router.rb:30:in `serve'
  
  actionpack (4.2.1) lib/action_dispatch/routing/route_set.rb:819:in `call'
  
  rack (1.6.4) lib/rack/etag.rb:24:in `call'
  
  rack (1.6.4) lib/rack/conditionalget.rb:38:in `call'
  
  rack (1.6.4) lib/rack/head.rb:13:in `call'
  
  actionpack (4.2.1) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
  
  actionpack (4.2.1) lib/action_dispatch/middleware/flash.rb:260:in `call'
  
  rack (1.6.4) lib/rack/session/abstract/id.rb:225:in `context'
  
  rack (1.6.4) lib/rack/session/abstract/id.rb:220:in `call'
  
  actionpack (4.2.1) lib/action_dispatch/middleware/cookies.rb:560:in `call'
  
  activerecord (4.2.1) lib/active_record/query_cache.rb:36:in `call'
  
  activerecord (4.2.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:649:in `call'
  
  activerecord (4.2.1) lib/active_record/migration.rb:378:in `call'
  
  actionpack (4.2.1) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
  
  activesupport (4.2.1) lib/active_support/callbacks.rb:88:in `call'
  
  activesupport (4.2.1) lib/active_support/callbacks.rb:88:in `_run_callbacks'
  
  activesupport (4.2.1) lib/active_support/callbacks.rb:776:in `_run_call_callbacks'
  
  activesupport (4.2.1) lib/active_support/callbacks.rb:81:in `run_callbacks'
  
  actionpack (4.2.1) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
  
  actionpack (4.2.1) lib/action_dispatch/middleware/reloader.rb:73:in `call'
  
  actionpack (4.2.1) lib/action_dispatch/middleware/remote_ip.rb:78:in `call'
  
  actionpack (4.2.1) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
  
  web-console (2.3.0) lib/web_console/middleware.rb:20:in `block in call'
  
  web-console (2.3.0) lib/web_console/middleware.rb:18:in `catch'
  
  web-console (2.3.0) lib/web_console/middleware.rb:18:in `call'
  
  actionpack (4.2.1) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
  
  railties (4.2.1) lib/rails/rack/logger.rb:38:in `call_app'
  
  railties (4.2.1) lib/rails/rack/logger.rb:20:in `block in call'
  
  activesupport (4.2.1) lib/active_support/tagged_logging.rb:68:in `block in tagged'
  
  activesupport (4.2.1) lib/active_support/tagged_logging.rb:26:in `tagged'
  
  activesupport (4.2.1) lib/active_support/tagged_logging.rb:68:in `tagged'
  
  railties (4.2.1) lib/rails/rack/logger.rb:20:in `call'
  
  actionpack (4.2.1) lib/action_dispatch/middleware/request_id.rb:21:in `call'
  
  rack (1.6.4) lib/rack/methodoverride.rb:22:in `call'
  
  rack (1.6.4) lib/rack/runtime.rb:18:in `call'
  
  activesupport (4.2.1) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
  
  rack (1.6.4) lib/rack/lock.rb:17:in `call'
  
  actionpack (4.2.1) lib/action_dispatch/middleware/static.rb:113:in `call'
  
  rack (1.6.4) lib/rack/sendfile.rb:113:in `call'
  
  railties (4.2.1) lib/rails/engine.rb:518:in `call'
  
  railties (4.2.1) lib/rails/application.rb:164:in `call'
  
  rack (1.6.4) lib/rack/lock.rb:17:in `call'
  
  rack (1.6.4) lib/rack/content_length.rb:15:in `call'
  
  rack (1.6.4) lib/rack/handler/webrick.rb:88:in `service'
  
  /home/felix/.rvm/rubies/ruby-2.0.0-p643/lib/ruby/2.0.0/webrick/httpserver.rb:138:in `service'
  
  /home/felix/.rvm/rubies/ruby-2.0.0-p643/lib/ruby/2.0.0/webrick/httpserver.rb:94:in `run'
  
  /home/felix/.rvm/rubies/ruby-2.0.0-p643/lib/ruby/2.0.0/webrick/server.rb:295:in `block in start_thread'

  UPDATE — Movie Uploader

  # encoding: utf-8
  
  class MovieUploader < CarrierWave::Uploader::Base
  
  
  
    # Include RMagick or MiniMagick support:
  
    # include CarrierWave::RMagick
  
    include CarrierWave::MiniMagick
  
    include CarrierWave::Video
  
    include CarrierWave::Video::Thumbnailer
  
    include CarrierWave::Backgrounder::Delay
  
  
  
    require 'rubygems'
  
    require 'streamio-ffmpeg'
  
  
  
    # Choose what kind of storage to use for this uploader:
  
    storage :fog
  
  
  
    # Override the directory where uploaded files will be stored.
  
    # This is a sensible default for uploaders that are meant to be mounted:
  
    def store_dir
  
      "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  
    end
  
  
  
    process :watermark_movie
  
  
  
    def watermark_movie
  
      puts "ssssssssssssssssssssssssssssssssss"
  
      puts self.file.inspect
  
  
  
      if self.file.path
  
        options = {watermark: "http://felix-hohlwegler.de/holz-soft/include/designs/design13/images/header.png", resolution: "640x360", watermark_filter: { position: "RT", padding_x: 10, padding_y: 10 } }
  
        self.model.file = FFMPEG::Movie.new(self.file.path).transcode("#{root}/#{cache_dir}/#{self.cache_id}/file.mp4", options)
  
      end
  
    end
  
  
  
    version :thumb do
  
      process thumbnail: [{format: 'png', quality: 10, size: 1200, strip: false, seek: 10, logger: Rails.logger}]
  
      def full_filename for_file
  
        png_name for_file, version_name
  
      end
  
    end
  
  
  
    def png_name for_file, version_name
  
      %Q{#{version_name}_#{for_file.chomp(File.extname(for_file))}.png}
  
    end
  
  
  
  
  
    # Add a white list of extensions which are allowed to be uploaded.
  
    # For images you might use something like this:
  
     def extension_white_list
  
       %w(mov avi mkv mpeg mpeg2 mp4 3gp)
  
     end
  
  end

• convert mp3 to wav using xuggle getting exception

  24 juin 2013, par Felix

  I am trying to convert mp3 to wav and the code is here :

  String mp3 = "F:\\work\\pic2talk38512.mp3";
  
  String wav = "F:\\work\\pic2talk38512.wav";
  
  TranscodeAudioAndVideo.transcodeTest(mp3, wav);
  
  
  
  public static void transcode(String sourceUrl, String destinationUrl) {
  
      IMediaReader reader = ToolFactory.makeReader(sourceUrl);
  
      reader.addListener(ToolFactory.makeWriter(destinationUrl, reader));
  
  
  
      while (reader.readPacket() == null)
  
              do {
  
              } while (false);
  
  }

  I got this exception :

  java.lang.UnsupportedOperationException: could not guess codec
  
  at com.xuggle.xuggler.IContainerFormat.establishOutputCodecId(IContainerFormat.java:454)
  
  at com.xuggle.xuggler.IContainerFormat.establishOutputCodecId(IContainerFormat.java:327)
  
  at com.xuggle.xuggler.IContainerFormat.establishOutputCodecId(IContainerFormat.java:300)
  
  at com.xuggle.mediatool.MediaWriter.addStreamFromContainer(MediaWriter.java:1134)
  
  at com.xuggle.mediatool.MediaWriter.getStream(MediaWriter.java:1039)
  
  at com.xuggle.mediatool.MediaWriter.encodeVideo(MediaWriter.java:742)
  
  at com.xuggle.mediatool.MediaWriter.encodeVideo(MediaWriter.java:783)
  
  at com.xuggle.mediatool.MediaWriter.onVideoPicture(MediaWriter.java:1434)
  
  at com.xuggle.mediatool.AMediaToolMixin.onVideoPicture(AMediaToolMixin.java:166)
  
  at com.xuggle.mediatool.MediaReader.dispatchVideoPicture(MediaReader.java:610)
  
  at com.xuggle.mediatool.MediaReader.decodeVideo(MediaReader.java:519)
  
  at com.xuggle.mediatool.MediaReader.readPacket(MediaReader.java:475)
  
  at com.renren.intl.soundsns.pictalk.utils.TranscodeAudioAndVideo.transcodeTest(TranscodeAudioAndVideo.java:75)
  
  at com.renren.intl.soundsns.pictalk.utils.TranscodeAudioAndVideoTest.convert(TranscodeAudioAndVideoTest.java:12)
  
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  
  at java.lang.reflect.Method.invoke(Method.java:597)
  
  at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
  
  at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
  
  at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
  
  at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
  
  at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
  
  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
  
  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
  
  at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
  
  at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
  
  at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
  
  at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
  
  at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
  
  at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
  
  at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
  
  at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
  
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
  
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
  
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
  
  at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

  I know that xuggle can figure out the conversion by the extension.But why this time is failed ?

  thanks

  edit :

  previously I can convert mp3 which params(MPEG 22.1KHZ 32kbps) to wav, but If I use the mp3(MPEG 44.1KHZ 62kbps) I got this exception ?

  How this happened ?