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• How can I get matplotlib to show full subplots in an animation ?

  12 mars 2015, par Matt Stone

  I’m trying to write a simple immune system simulator. I’m modeling infected tissue as a simple grid of cells and various intracellular signals, and I’d like to animate movement of cells in one plot and the intensity of viral presence in another as the infection progresses. I’m doing so with the matshow function provided by matplotlib. However, when I plot the two next to each other, the full grid gets clipped unless I stretch out the window myself. I can’t address the problem at all when saving to an mp4.

  Here’s the default view, which is identical to what I observe when saving to mp4 :
  

  And here’s what it looks like after stretching out the viewer window
  

  I’m running Python 2.7.9 with matplotlib 1.4.2 on OS X 10.10.2, using ffmpeg 2.5.2 (installed via Homebrew). Below is the code I’m using to generate the animation. I tried using plt.tight_layout() but it didn’t affect the problem. If anyone has any advice as to how to solve this, I’d really appreciate it ! I’d especially like to be able to save it without viewing with plt.show(). Thanks !

  def animate(self, fname=None, frames=100):
  
      fig, (agent_ax, signal_ax) = plt.subplots(1, 2, sharey=True)
  
  
  
      agent_ax.set_ylim(0, self.grid.shape[0])
  
      agent_ax.set_xlim(0, self.grid.shape[1])
  
      signal_ax.set_ylim(0, self.grid.shape[0])
  
      signal_ax.set_xlim(0, self.grid.shape[1])
  
  
  
      agent_mat = agent_ax.matshow(self.display_grid(),
  
                                   vmin=0, vmax=10)
  
      signal_mat = signal_ax.matshow(self.signal_display(virus),
  
                                     vmin=0, vmax=20)
  
      fig.colorbar(signal_mat)
  
  
  
      def anim_update(tick):
  
          self.update()
  
          self.diffuse()
  
          agent_mat.set_data(self.display_grid())
  
          signal_mat.set_data(self.signal_display(virus))
  
          return agent_mat, signal_mat
  
  
  
      anim = animation.FuncAnimation(fig, anim_update, frames=frames,
  
                                     interval=3000, blit=False)
  
  
  
      if fname:
  
          anim.save(fname, fps=5, extra_args=['-vcodec', 'libx264'])
  
      else:
  
          plt.show()

• Concatination of images and videos in FFMpeg [closed]

  29 octobre 2023, par Juliano David Hilario

  I've been trying to concat pieces of videos with mix of images in FFMpeg and I can not achieve desired results. I'm trying to create a mock interview project for a friend, she answers the questions from a script. The question should be flashed in the screen before the footage of her answering is shown. The videos are encoded in H.265, with frame rate of 30fps, (via mediainfo) and when I try to concat the videos and images using the concat demuxer, it shows this message in rapid succession and only output the first image in the given duration in the output file : (meaning it failed when concating the video, I assume this is due to the fact that demuxed images doesn't have audio streams.)

  


  [png @ 0x55b4a4cb3540] Invalid PNG signature 0x3DB0201D430.
Error while decoding stream #0:0: Invalid data found when processing input


  


  the command I've used :

  


  ffmpeg -hide_banner -y -f concat -safe 0 -i concat.con -r 30 -c:v libx265 -c:a aac -pix_fmt yuv420p out.mp4


  


  the slice of concat.con file :

  


  file slides/1.png
duration 6
file parts/1.mp4
file slides/2.png
duration 8
file parts/2.mp4
file slides/3.png
duration 9
file parts/3.mp4
. . .
duration 12
file parts/9.mp4
file slides/10.png
duration 9
file parts/10.mp4



  


  Since, I need to get this done if possible today, I tried this route of turning the images into videos by this command :

  


  #!/bin/sh

ffmpeg -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100 -loop 1 -i "${1}.png" -c:v libx265 -r 30 -c:a aac -t "$2" -pix_fmt yuv420p "${1}_slide.mp4"


  


  This does create the desired result of a static video without sound but still has an audio channel (which is a pre-requisite for the concat demuxer), but when I concat it with the same command above with videos, the videos' audio desyncs and advances, now the video delays with the audio, which is not obviously feasable for the project. I suspect it has to do with frames and PTS, as MPV (a media player) logs when the duration of the video enters the video that has been concatinated that the PTS is invalid, and says :

  


  Invalid audio PTS: 6.037188 -> 6.553832

Audio/Video desynchronisation detected! Possible reasons include too slow
hardware, temporary CPU spikes, broken drivers, and broken files. Audio
position will not match to the video (see A-V status field).


  


  Tried turning the pictures into an image, and was expecting it to atleast sync with the audio

  


• Progress Bar findviewbyid returns null

  1er avril 2017, par ziad kiwan

  Help me please it’s getting frustrating !

  i’m doing a chat application where i’m adding views to a linear layout programmatically each time a user press the send button the code is below :

  public  void appendToMessageHistory(String id,String uname, String messa,String messageType, final String filepath, String DownloadStatus,boolean internet,int type) {
  
  
  
  
  
      //TextView tv=new TextView(Messaging.this);
  
      LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(Width, LinearLayout.LayoutParams.WRAP_CONTENT);
  
      lp.setMargins(0, 10, 0, 0);
  
  
  
      View v = getLayoutInflater().inflate(R.layout.message_entity, null);
  
  
  
  
  
      TextView mess;
  
      TextView time;
  
      final ImageView iv;
  
      final ProgressBar progressBar;
  
      ImageView statusiv;
  
      if (friend.userName.equals(uname)) {
  
          v = getLayoutInflater().inflate(R.layout.message_entity, null);
  
          v.setId(Integer.parseInt(id));
  
          mess = (TextView) v.findViewById(R.id.message_entity_message);
  
          time = (TextView) v.findViewById(R.id.message_entity_time);
  
          iv = (ImageView) v.findViewById(R.id.message_entity_imageview);
  
          statusiv = (ImageView) v.findViewById(R.id.imageView);
  
          progressBar = (ProgressBar) v.findViewById(R.id.message_entity_progressbar);
  
      } else {
  
          v = getLayoutInflater().inflate(R.layout.message_entity_right, null);
  
          lp.gravity = Gravity.RIGHT;
  
          v.setId(Integer.parseInt(id));
  
          mess = (TextView) v.findViewById(R.id.message_entity_right_message);
  
          time = (TextView) v.findViewById(R.id.message_entity_right_time);
  
          iv = (ImageView) v.findViewById(R.id.message_entity_right_imageview);
  
          statusiv = (ImageView)v.findViewById(R.id.imageViewleft);
  
          progressBar = (ProgressBar) v.findViewById(R.id.message_entity_Right_progressbar);
  
      }
  
  
  
      try {
  
          progressBar.setId(Integer.parseInt(id));
  
  
  
      } catch (Exception e) {
  
          e.printStackTrace();
  
      }
  
  
  
      if (messageType != null) {
  
          if (messageType.equals(MessageInfo.MESSAGE_TYPE_PIC)) {
  
              iv.setImageBitmap(ImageHandlet.GetBitmapFromPath(filepath));
  
              progressBar.setVisibility(View.GONE);
  
              iv.setOnClickListener(new OnClickListener() {
  
                  @Override
  
                  public void onClick(View v) {
  
                      Intent intent = new Intent();
  
                      intent.setAction(Intent.ACTION_VIEW);
  
                      intent.setDataAndType(Uri.parse("file://" + filepath), "image/png");
  
                      startActivity(intent);
  
                      Log.d("FIlePAth", filepath);
  
                  }
  
              });
  
  
  
          } else if (messageType.equals(MessageInfo.MESSAGE_TYPE_VIDEO)) {
  
              if (DownloadStatus.equals(LocalStorageHandler.DOWNLOADED)) {
  
                  if(!(friend.userName.equals(uname))) {
  
                      if (type != 3) {
  
                          Bitmap bitTh = ThumbnailUtils.createVideoThumbnail(filepath, MediaStore.Images.Thumbnails.MINI_KIND);
  
                          iv.setImageBitmap(bitTh);
  
                          progressBar.setVisibility(View.GONE);
  
                          iv.setOnClickListener(new OnClickListener() {
  
                              @Override
  
                              public void onClick(View v) {
  
                                  Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(filepath));
  
                                  intent.setDataAndType(Uri.parse(filepath), "video/mp4");
  
                                  startActivity(intent);
  
  
  
                              }
  
                          });
  
                      } else {
  
                          Log.w("Zipping","Progress Bar");
  
                          progressBar.setVisibility(View.VISIBLE);
  
                      }
  
                  } else {
  
                      Bitmap bitTh = ThumbnailUtils.createVideoThumbnail(filepath, MediaStore.Images.Thumbnails.MINI_KIND);
  
                      iv.setImageBitmap(bitTh);
  
                      progressBar.setVisibility(View.GONE);
  
                      iv.setOnClickListener(new OnClickListener() {
  
                          @Override
  
                          public void onClick(View v) {
  
                              Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(filepath));
  
                              intent.setDataAndType(Uri.parse(filepath), "video/mp4");
  
                              startActivity(intent);
  
  
  
                          }
  
                      });
  
                  }
  
              } else if (DownloadStatus.equals(LocalStorageHandler.NotDOWNLOADED)) {
  
                  iv.setTag(id);
  
                  iv.setImageResource(R.drawable.download);
  
                  iv.setOnClickListener(new OnClickListener() {
  
                      @Override
  
                      public void onClick(View v) {
  
                          progressBar.setVisibility(View.VISIBLE);
  
                          Cursor c = localstoragehandler.getIDnfo(iv.getTag().toString());
  
                          String filepath = "";
  
                          //Toast.makeText(getApplication(),iv.getTag().toString()+" iD " +iv.getId(),Toast.LENGTH_SHORT).show();
  
  
  
                          while (c.moveToNext()) {
  
                              String msg0 = c.getString(0);
  
                              String msg2 = c.getString(2);
  
                              String msg3 = c.getString(3);
  
                              String msg4 = c.getString(4);
  
                              String msg5 = c.getString(5);
  
                              String msg6 = c.getString(6);
  
  
  
                              filepath = msg5;
  
  
  
                              Log.d("-----------Vedio-----", "------------------");
  
                              Log.d("DATABASE---------", msg0);
  
                              Log.d("DATABASE-------", msg2);
  
                              Log.d("DATABASE---------", msg3);
  
                              Log.d("DATABASE-----", msg4 + "");
  
                              Log.d("DATABASE-------", msg5 + "");
  
                              Log.d("DATABASE----------", msg6 + "");
  
                              Log.d("--------END-------", "-------END-----------");
  
  
  
  
  
                          }
  
  
  
                          Toast.makeText(getApplicationContext(), filepath.toString() + iv.getTag().toString(), Toast.LENGTH_SHORT).show();
  
  
  
                          DownloadFileFromURL downloadFileFromURL = new DownloadFileFromURL(filepath, iv.getTag().toString());
  
                          downloadFileFromURL.execute("");
  
                      }
  
                  });
  
              }
  
          } else {
  
              iv.setVisibility(View.GONE);
  
              progressBar.setVisibility(View.GONE);
  
          }
  
      }
  
      if(!(messageType.equals(MessageInfo.MESSAGE_TYPE_VIDEO))) {
  
          if (!internet) {
  
              statusiv.setImageResource(R.drawable.noconnectionl);
  
          }
  
      }
  
      mess.setText(messa);
  
      //time.setText(sendt);
  
      v.setLayoutParams(lp);
  
      final View lastview = v;
  
      runOnUiThread(new Runnable() {
  
          @Override
  
          public void run() {
  
              mEssageBox.addView(lastview);
  
  
  
          }
  
      });
  
      scrollView.post(new Runnable() {
  
          @Override
  
          public void run() {
  
              scrollView.fullScroll(View.FOCUS_DOWN);
  
              messageText.requestFocus();
  
          }
  
      });
  
  }

  and here is the XML of the dialogbox :

  <?xml version="1.0" encoding="utf-8"?>
  
  <relativelayout>
  
  
  
  <imageview></imageview>
  
  
  
  <relativelayout>
  
  
  
  
  
      <textview></textview>
  
  
  
      <textview></textview>
  
  
  
  
  
      <imageview></imageview>
  
  
  
      <progressbar style="?android:attr/progressBarStyleLarge"></progressbar>
  
  
  
  
  
  </relativelayout>
  
  </relativelayout>

  And here is the code to send the video message :

  final String message = messageText.getText().toString();
  
      final Long rowid = localstoragehandler.insert(imService.getUsername(), friend.userName, message, MessageInfo.MESSAGE_TYPE_VIDEO, ZippedVideoPath, LocalStorageHandler.DOWNLOADED); //insert data into db and get to chat_id
  
      appendToMessageHistory(rowid + "", imService.getUsername(), message, MessageInfo.MESSAGE_TYPE_VIDEO, ZippedVideoPath, LocalStorageHandler.DOWNLOADED, internet,3);// append the video with type 3 to just display the progress 
  
      messageText.setText("Video");
  
      String newstr = null;
  
      // intialize the asynctask to upload the video
  
      class UploadVideo extends AsyncTask {
  
          ProgressDialog uploading;
  
          View V;
  
          UploadVideo(View v){
  
              V = v;
  
          }
  
  
  
          @Override
  
          protected void onPreExecute() {
  
              super.onPreExecute();
  
              //          uploading = ProgressDialog.show(Messaging.this, "Uploading File", "Please wait...", false, false);
  
          }
  
  
  
          @Override
  
          protected String doInBackground(Void... params) {
  
              return imService.sendVideoMessage(imService.getUsername(), friend.userName, message, MessageInfo.MESSAGE_TYPE_VIDEO, "", ZippedVideoPath);
  
          }
  
  
  
          @Override
  
          protected void onPostExecute(String s) {
  
              super.onPostExecute(s);
  
           //   RelativeLayout v = (RelativeLayout) V.findViewById(rowid.intValue());
  
          //    Log.w("Zipping",v.toString());
  
       //       ProgressBar progressBar1 = (ProgressBar) V.findViewById(R.id.message_entity_Right_progressbar);
  
        //      Log.w("Zipping",progressBar1.toString());
  
              //          ImageView iv = (ImageView) v.findViewById(R.id.message_entity_right_imageview);
  
         //     progressBar1.setVisibility(View.GONE);
  
          //  Log.d("POST Execute", s + "");
  
  
  
              //textViewResponse.setText(Html.fromHtml("<b>Uploaded at <a href="http://stackoverflow.com/feeds/tag/&#034; + s + &#034;">" + s + "</a></b>"));
  
              //textViewResponse.setMovementMethod(LinkMovementMethod.getInstance());
  
      // here i am preparing the path so when the compress is done to save into.
  
          }
  
      }
  
      if (null != absolute &amp;&amp; absolute.length() > 0) {
  
          int endIndex = absolute.lastIndexOf("/");
  
          if (endIndex != -1) {
  
              newstr = absolute.substring(endIndex, absolute.length()); // not forgot to put check if(endIndex != -1)
  
          }
  
      }
  
      Log.w("Zipping", newstr);
  
      final File videosdir = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/videos/");
  
      if (!videosdir.exists()) {
  
          videosdir.mkdirs();
  
      }
  
      ZippedVideoPath = videosdir.getAbsolutePath() + "/" + newstr;
  
      Log.w("Zipping", ZippedVideoPath);
  
      // here i got the ffmpeg library from the net to compress the video and i'm preparing the commands
  
      String[] complexCommand = {"-y", "-i", absolute, "-strict", "experimental", "-r", "25", "-vcodec", "mpeg4", "-b:a", "150k", "-ab", "48000", "-ac", "2", "-ar", "22050", ZippedVideoPath};
  
      FFmpeg ffmpeg = FFmpeg.getInstance(getBaseContext());
  
      try {
  
          // to execute "ffmpeg -version" command you just need to pass "-version"
  
          ffmpeg.execute(complexCommand, new ExecuteBinaryResponseHandler() {
  
  
  
              @Override
  
              public void onStart() {
  
                  Log.w("Zipping", "started");
  
              }
  
  
  
              @Override
  
              public void onProgress(String message) {
  
              }
  
  
  
              @Override
  
              public void onFailure(String message) {
  
                  Log.w("Zipping", message);
  
              }
  
  
  
              @Override
  
              public void onSuccess(String message1) {
  
                  Log.w("Zipping","Success");
  
                  RelativeLayout v = (RelativeLayout) mEssageBox.findViewById(rowid.intValue());
  
                  Log.w("VideoView",v.toString());
  
                  ProgressBar progressBar = (ProgressBar) v.findViewById(R.id.message_entity_Right_progressbar);
  
                  ImageView iv = (ImageView) v.findViewById(R.id.message_entity_right_imageview);
  
              //  progressBar.setVisibility(View.GONE);
  
                  Bitmap bitTh = ThumbnailUtils.createVideoThumbnail(ZippedVideoPath, MediaStore.Images.Thumbnails.MINI_KIND);
  
                  iv.setImageBitmap(bitTh);
  
                  progressBar.setVisibility(View.GONE);
  
                  iv.setOnClickListener(new OnClickListener() {
  
                      @Override
  
                      public void onClick(View v) {
  
                          Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(ZippedVideoPath));
  
                          intent.setDataAndType(Uri.parse(ZippedVideoPath), "video/mp4");
  
                          startActivity(intent);
  
  
  
                      }
  
                  });
  
                  UploadVideo uv = new UploadVideo(v);
  
                  uv.execute();
  
              }
  
  
  
              @Override
  
              public void onFinish() {
  
              }
  
          });
  
      } catch (FFmpegCommandAlreadyRunningException e) {
  
          Log.w("Zipping", e.toString());
  
      }
  
  }

  okay now to the problem when i call the findviewbyid for the progress bar in sendvideomessage ffmpeg onsuccess callback it returns null even though the findviewbyid for the the imageview which is in the same layout it returns the view ! so please tell me what is the problem

  public void onSuccess(String message1) {
  
                  Log.w("Zipping","Success");
  
                  RelativeLayout v = (RelativeLayout) mEssageBox.findViewById(rowid.intValue()); ;
  
                  ProgressBar progressBar = (ProgressBar) v.findViewById(R.id.message_entity_Right_progressbar); // this keeps returning null!
  
                  ImageView iv = (ImageView) v.findViewById(R.id.message_entity_right_imageview); // returns the view
  
              //  progressBar.setVisibility(View.GONE);
  
                  Bitmap bitTh = ThumbnailUtils.createVideoThumbnail(ZippedVideoPath, MediaStore.Images.Thumbnails.MINI_KIND);
  
                  iv.setImageBitmap(bitTh);
  
                  progressBar.setVisibility(View.GONE);
  
                  iv.setOnClickListener(new OnClickListener() {
  
                      @Override
  
                      public void onClick(View v) {
  
                          Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(ZippedVideoPath));
  
                          intent.setDataAndType(Uri.parse(ZippedVideoPath), "video/mp4");
  
                          startActivity(intent);
  
  
  
                      }
  
                  });
  
                  UploadVideo uv = new UploadVideo(v);
  
                  uv.execute();
  
              }

  Thank you !