Recherche avancée

Sur d’autres sites (4775)

• Matplotlib - Why is my saved animation video blank ?

  4 juillet 2022, par Pat X

  This should be pretty simple but I just don't know.

  



  A newbie to Python and FFmpeg. Just trying to save a test video from ArtistAnimation but got blank video.

  



  Before I tried to produce the video, I can see the animation by plt.show() (without "matplotlib.use("Agg")" ). I have already installed FFmpeg in Anaconda as well.

  



  To ensure my FFmpeg is functioning, I used the code from matplotlib example and produced a video that looks perfect. (I guess this means my FFmpeg will work fine from now on ?)

  



  Then, I only changed the figure to my version. Having compared the figure part, I didn't see anything wrong obviously. But in the saved video of my version, it's blank.

  



  import matplotlib
matplotlib.use("Agg")
import matplotlib.pyplot as plt
import matplotlib.animation as ani
import numpy as np
import pandas as pd


fig = plt.figure()
ims = []
for i in range(10):
    ax1 = plt.subplot2grid((2, 2), (0, 0), colspan=2, rowspan=2)
    data = np.random.normal(0, 1, i+1)
    pd.DataFrame(data).plot(kind='bar', ax=ax1)
    ims.append([ax1])



# Set up formatting for the movie files
Writer = ani.writers['ffmpeg']
writer = Writer(fps=15, metadata=dict(artist='Me'), bitrate=1800)

anim = ani.ArtistAnimation(fig, ims, interval=500, repeat_delay=3000, blit=True)
anim.save('textmovie.mp4', writer=writer)
plt.show()


  


• play m3u8 video from laravel storage

  21 janvier 2020, par Jennsen

  My question is the same as how to play m3u8 videos from laravel storage but this one did not get answers.

  If I play the video from the public folder it does it without problems.

  but if I want to play it from storage this doesn’t work.

      public function watch(Request $request, Episode $episode)
  
  {
  
  
  
      $video = Storage::disk('videos')->get($episode->video);
  
  
  
      return new Response($video, 200, ['Content-Type' => 'application/x-mpegURL', 'isHls' => true]);
  
  }

  this is the definition of my disk in config/filesystems.php

    'videos' => [
  
          'driver' => 'local',
  
          'root' => storage_path('app/videos'),
  
          'url' => env('APP_URL').'/storage',
  
          'visibility' => 'public',
  
      ],

  this is my conversion code (job)

       */
  
  public function handle()
  
  {
  
      $path = $this->episode->id . '.m3u8';
  
      $lowBitrate  = (new X264 ('aac'))->setKiloBitrate(500)->setVideoCodec('libx264');
  
      $midBitrate  = (new X264 ('aac'))->setKiloBitrate(1000)->setVideoCodec('libx264');
  
      $highBitrate = (new X264 ('aac'))->setKiloBitrate(3000)->setVideoCodec('libx264');
  
  
  
      FFMpeg::fromDisk('tmp')->open($this->episode->video)
  
          ->exportForHLS()
  
          ->dontSortFormats()
  
          ->setSegmentLength(10)
  
          ->toDisk('local')
  
          ->addFormat($lowBitrate, function($media) {
  
              $media->addFilter(function ($filters) {
  
                  $filters->resize(new \FFMpeg\Coordinate\Dimension(640, 480));
  
              });
  
          })
  
          ->addFormat($midBitrate, function($media) {
  
              $media->addFilter(function ($filters) {
  
                  $filters->resize(new \FFMpeg\Coordinate\Dimension(1280, 960));
  
              });
  
          })
  
          ->addFormat($highBitrate, function($media) {
  
              $media->addFilter(function ($filters) {
  
                  $filters->resize(new \FFMpeg\Coordinate\Dimension(1280, 960));
  
              });
  
          })
  
          ->save($path);
  
  
  
      $this->episode->update([
  
          'video' => $path,
  
      ]);
  
  
  
      FFMpeg::cleanupTemporaryFiles();
  
  
  
  }

• Scale and overlay multiple images ffmpeg android error

  27 décembre 2019, par Shweta Patil

  I am trying to place multiple images/gif on image at background.But I am not able to scale all the images before overlay.

   String[] command=new String[13];
  
          command[0]="-i";
  
          command[1]=input;
  
          command[2]="-i";
  
          command[3]=thumbnail2;
  
          command[4]="-i";
  
          command[5]=thumbnail;
  
          command[6]="filter_complex";
  
          command[7]="[0:v]scale=0:0[base]";
  
          command[8]="[1:v]scale=30:-1[img1]";
  
          command[9]="[2:v]scale=3000:-1[img2]";
  
          command[10]="[base][img1]overlay=70:70[tmp1]";
  
          command[11]="[tmp1][img2]overlay=(main_w-overlay_w)/2:y=(main_h-overlay_h)/2[out]";
  
          command[12]="/storage/emulated/0/Pictures/logo-2000.gif";
  
  
  
          fFmpeg.execute(command,
  
                  new ExecuteBinaryResponseHandler() {
  
  
  
                      @Override
  
                      public void onStart() {
  
                          //for logcat
  
                          Log.w(TAG,"Cut started");
  
                      }
  
  
  
                      @Override
  
                      public void onProgress(String message) {
  
                         Log.w(TAG,message.toString());
  
                      }
  
  
  
                      @Override
  
                      public void onFailure(String message) {
  
  
  
                          Log.w(TAG,message.toString());
  
                          Toast.makeText(getApplicationContext(),"Error",Toast.LENGTH_SHORT).show();
  
  
  
                      }
  
  
  
                      @Override
  
                      public void onSuccess(String message) {
  
  
  
                          Log.w(TAG,message.toString());
  
                          Toast.makeText(getApplicationContext(),"sucessfully saved",Toast.LENGTH_SHORT).show();
  
                      }
  
  
  
                      @Override
  
                      public void onFinish() {
  
  
  
                          Log.w(TAG,"Cutting video finished");
  
                      }
  
                  });

  Please help to scale the images simultaneously.
  The error I am getting is :

  [NULL @ 0xb3211e00] Unable to find a suitable output format for
  ’filter_complex’ filter_complex : Invalid argument