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• Is it possible to update a filter option while paused in ffplay ?

  25 juin 2020, par peggo

  I am using zmq to send filter option updates to ffplay while a video is playing. However, I would also like to be able to change say the zoom level while paused (I'm using scale and crop filters for this). If I do a zmq send command while paused nothing happens and I don't get a response.

  


  If this is not possible, are there any workarounds ? I thought about using the loop filter instead of pausing, but I don't think you can change the options for that filter at runtime. So unless I know exactly where I want to pause in advance (which I don't) then I don't see a way to do this.

  


  Thanks !

  


• OpenCV write jpeg buffer into Popen object

  5 novembre 2017, par M Leonard

  I am doing some image operations on a numpy array via OpenCV. These images are then being baked out to jpeg, then ingested into FFMPEG to make a video. However, baking it out to a file is not very efficient. I would like to stream this directly into FFMPEG. In theory, it would look something like this :

  p = Popen(['/usr/local/bin/ffmpeg', '-s', '1920x1080',
  
                     '-pix_fmt', 'yuvj420p',
  
                     '-y',
  
                     '-f', 'image2pipe',
  
                     '-vcodec', 'mjpeg',
  
                     '-r', self.fps,
  
                     '-i', '-',
  
                     '-r', self.fps,
  
                     '-f', 'mp4',
  
                     '-vcodec', 'libx264',
  
                     '-preset', 'fast',
  
                     # '-crf', '26',
  
                     'output/{}.mp4'.format(self.animation_name)], stdin=PIPE)
  
  
  
  image_resize = cv.resize(self.original_image, (0, 0), fx=zoom, fy=zoom)
  
  M = np.float32([[1, 0, x_total], [0, 1, y_total]])
  
  image_offset = cv.warpAffine(image_resize, M, (self.original_image_width, self.original_image_width))
  
  image = image_offset[0:self.output_raster_height, 0:self.output_raster_width].copy()    
  
  cv.imwrite(p.stdin, image) # this doesn't actually work, but that's the idea...

  I’ve been able to achieve this with Pillow using this setup :

  p = Popen(['/usr/local/bin/ffmpeg', '-s', '1920x1080',
  
                     '-pix_fmt', 'yuvj420p',
  
                     '-y',
  
                     '-f', 'image2pipe',
  
                     '-vcodec', 'mjpeg',
  
                     '-r', self.fps,
  
                     '-i', '-',
  
                     '-r', self.fps,
  
                     '-f', 'mp4',
  
                     '-vcodec', 'libx264',
  
                     '-preset', 'fast',
  
                     # '-crf', '26',
  
                     'output/{}.mp4'.format(self.animation_name)], stdin=PIPE)
  
  
  
  image_resize = self.original_image.resize((resize_width, resize_height), resample=PIL.Image.BICUBIC)
  
  image_offset = ImageChops.offset(image_resize, xoffset=int(x_total), yoffset=int(y_total))
  
  image = image_offset.crop((0, 0, self.output_raster_width, self.output_raster_height))
  
  
  
  image.save(p.stdin, 'JPEG')

  So, my question is :

  How would I write an OpenCV Jpeg buffer into the p.stdin object like it’s being done in the Pillow version ?

• Anomalie #3633 (Nouveau) : probleme appel de la mediabox

  2 janvier 2016, par tofulm -

  Bonjour,
  dans un squelette toto.html, j’ai un inclure en ajax avec un squelette qui comporte plusieurs liens de la forme
  

  &lt;script&gt;<br />
  
  jQuery(document).ready(function(){<br />
  
       jQuery(&quot;a.appel_mediabox&quot;).mediabox();<br />
  
  ...<br />
  
  &lt;/script&gt;
  
  

  au chargement de la page, j’ai les mediabox qui se lancent "vides" au lieu d’attendre le click sur le lien.

  le problème vient de :
  http://zone.spip.org/trac/spip-zone/browser/_core_/plugins/mediabox/javascript/spip.mediabox.js#L89

  Ce test n’était pas présent en spip 3.0 et le même code fonctionnait.

  Si je supprime ce test et le remplace par :
  

  return this.colorbox($.extend(cbox_options,options)) ;
  

  tout est ok

  Merci