Recherche avancée

Sur d’autres sites (10435)

• Processing3 get "Error=2 No such file or directory" with a file that actually doesn't exist at the first place

  29 octobre 2016, par Tuang Pingfavilunda

  I cannot figure it out what happen to my Processing file. I am trying to use VideoExport library and my Macbook Pro cannot play it, but the Mac-mini is able to do so.

  Before the error happened it is another error=13 permission denied thing, so I messed in the terminal for a while with chmod 777 and finding the file with ls. I don’t know if that may be the reason that caused this happen. FYI, I also installed ffmpeg already.

  And this is the full error :

      java.io.IOException: Cannot run program "/Users/Tuang/Desktop/DMA_WORKS/Work1_Facial Muscles/Cam_Rec/sketch_161027a/sketch_161027a.pde": error=2, No such file or directory
  
      at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
  
      at com.hamoid.VideoExport.startFfmpeg(Unknown Source)
  
      at com.hamoid.VideoExport.initialize(Unknown Source)
  
      at com.hamoid.VideoExport.saveFrame(Unknown Source)
  
      at Basic.draw(Basic.java:32)
  
      at processing.core.PApplet.handleDraw(PApplet.java:2412)
  
      at processing.awt.PSurfaceAWT$12.callDraw(PSurfaceAWT.java:1540)
  
      at processing.core.PSurfaceNone$AnimationThread.run(PSurfaceNone.java:316)
  
  Caused by: java.io.IOException: error=2, No such file or directory
  
      at java.lang.UNIXProcess.forkAndExec(Native Method)
  
      at java.lang.UNIXProcess.<init>(UNIXProcess.java:247)
  
      at java.lang.ProcessImpl.start(ProcessImpl.java:134)
  
      at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
  
      ... 7 more
  
  VideoExport error: Ffmpeg failed. Study /Users/Tuang/Desktop/DMA_WORKS/Work1_Facial_Muscles/Camera_Recorder/Basic/basic.mp4.txt for more details.
  
  Could not run the sketch (Target VM failed to initialize).
  
  For more information, read revisions.txt and Help → Troubleshooting.
  
  </init>

  ---

  1) The java.io.IOException : trying to call "/Work1_Facial Muscles/Cam_Rec/sketch_161027a/sketch_161027a.pde" which doesn’t exist for real. It is gone for a long time but seems like the program stuck here.

  2) "basic" is a file name from the Example of the Library. I just use it to test. Surprisingly, Every files that have been saved and changed the name still get the java.io.IOException’s error of the missing sketch_161027a.pde file.

  ---

  What I have done :
  1 I have already done the Homebrew thing to install ffmpeg.
  2 I deleted everything of Processing and reinstall it again.

  Any suggestion ?

• Evolution #3953 : formulaire de date sur les rubriques

  12 février 2021, par RastaPopoulos ♥

  Dans tous les cas il me semble nécessaire de pouvoir agir sur les dates des objets, sachant qu’historiquement les dates des rubriques sont liées automatiquement à la date de leur dernier article, faudrait-il trouver une solution pour bloquer/débloquer cet automatisme ?

  1) Les dates des rubriques sont liés aux articles, mais il me semble que soit la doc n’est pas assez explicite, soit le code ne va pas jusqu’au bout (mais ça impliquerait possiblement des trop gros tests). En effet, la date des rubriques n’est pas liée vaguement à la date du contenu le plus récent publié dedans. :) C’est plus fourbement précis : c’est la date du dernier contenu dont le statut a été mis en publié pendant qu’il était dans cette rubrique. Et ça à défaut de changer le code pour l’instant, il faudrait au moins le dire moins sibyllin. Concrètement ça signifie que si on déplace un article (publié bien sûr) depuis une autre rubrique dedans après coup, avec une date plus récente, ça ne change rien à la date de la rubrique (dont le contenu a pourtant changé toute autant qu’en publiant direct depuis dedans). En théorie il faudrait que ça change en cascade la date de tous les parents quand on déplace un article (la rubrique de destination et toute la hiérarchie). Et possiblement d’autres cas de ce genre.

  2) Quoiqu’il en soit, même s’il y a un changement de date par défaut, je pense aussi qu’il faut pouvoir décider qu’on veut la changement manuellement après coup. Si on a une liste de rubriques "par date de contenu récent", on peut rien corriger actuellement si les dates ne vont pas. Là j’ai le cas après une migration WP par exemple.

  En attendant faudrait un mini plugin tout simple pour ajouter le form de date sur les rubriques comme le montre touti au début. Mais est-ce ça devrait pas être natif directement ?

• ffmpeg : video to images with pts in filename

  12 février 2016, par ntg

  I am trying to extract images of exact times (say every second) from a mp4 video of an experiment. There are a lot of methods to do that using ffmpeg out there, but surprisingly enough the time accuracy is off.

  To measure accuracy, I have first time-stamped the video using pts, e.g. :

  -vf "[in] scale=640:-2 , drawtext=fontcolor=white:fontsize=22:fontfile='times.ttf':timecode='22\:10\:55\:00:text='03/12/15__':r=23.976023976:x=0:y=0 [out]"

  And as a result I got a millisecond precision time-stamp on the video. I checked the video and it seems the time-stamps are very accurate. I then tried all the methods I could find out there including :

  -Using -ss [timestamp] to go to an exact time and -vframes 1 to get the first frame at that time : this method is extremely slow since it involves calling ffmpeg once for each second of the video. Furthermore, seems to work fine for the first minutes, but then gets out of sync.

  -Using fps=1 and using out_%05d.jpg as the output. This was probably the most inaccurate, as it went off by whole seconds, plus it never got exactly the 0th millisecond.

  -Using a fast fps, and then selecting only the ones I need, e.g. -vf "fps=10, framestep=10, select=not(mod(n\,40))" was promising for the first minutes, but also became inaccurate after that.

  -I tried writing the pts/date as metadata, but (do not know how to /cannot) write to the metadata of a .jpg from ffmpeg...

  The problem is that after some time, if we are using out_%05d.jpg, the numbers get completely out of sinc, while the -ss gets inaccurate, and takes forever.

  Ideally there should be a way to write the %pts or the date as part of the filename... Does anyone know a method to extract images from an .mp4 file with millisecond precision, preferably using ffmpeg (or its library ? I am using python and getting desperate...)

  [Edit : as explained in the comment by Mulvya, the pts is calculated by using the fps of the video, ffmpeg can give it to you. In my case some of the videos have 30 and others 24*(100/1001) fps. Bellow is an example, which was produced by :

  args = ['ffmpeg',
  
   '-i',
  
   'c:\\Temp\\scr_cam.mp4',
  
   '-y',
  
   '-vf',
  
   "[in] drawtext=fontcolor=black:fontsize=22:fontfile='times.ttf':timecode='17\\:00\\:29\\:00':text='09/02/16__':r=30.0:x=0:y=0, drawtext=fontcolor=black:fontsize=22:fontfile='times.ttf':timecode='00\\:00\\:00\\:00':text='':r=30.0 :x=0:y=30, drawtext=fontcolor=black:fontsize=22:fontfile='times.ttf':text='n\\: %{n}   pts\\:%{pts}':r=30.0:x=0:y=60 [out]",
  
   '-c:a',
  
   'copy',
  
   '-metadata',
  
   'creation_time=2016-02-09T17:00:29',
  
   '-preset',
  
   'ultrafast',
  
   '-threads',
  
   '3',
  
   'c:\\Temp\\stamped_scr_cam.mp4']
  
  subprocess.call(args)

  In it we see that indeed pts = n/30 (n is the frame no). I have tried many combinations of the params of the commands I talk in the beginning, so listing all my efforts would take too much space. As we see, the drawtext seems to be very accurate, so it does not seem to be a problem of incorrect fps.

  

  To get the fps I am using :

  def get_frame_rate_and_duration(filename):
  
      if not os.path.exists(filename):
  
          sys.stderr.write("ERROR: filename %r was not found!" % (filename,))
  
          return -1
  
      args = ["ffprobe",filename,"-v","0","-select_streams","v","-print_format","flat"]
  
      args.extend(["-show_entries","stream=r_frame_rate"])
  
      args.extend(["-show_entries","format=duration"])
  
      out = subprocess.check_output(args).split("\n")
  
      rate = out[0].split('=')[1].strip()[1:-1].split('/')
  
      duration = pd.Timedelta("{0} sec".format(out[1].split('=')[1].strip()[1:-1]))
  
      if len(rate)==1:
  
          rate = float(rate[0])
  
      if len(rate)==2:
  
          rate =  float(rate[0])/float(rate[1])
  
      else:
  
          rate = -1
  
      return rate, duration