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• Python running a cmd command(ffmpeg) with subprocess and wait for cmd to close before executing some code

  14 décembre 2019, par Fam

  So im using ffmpeg to resize a video, and this takes a little while so before the code continues i have to wait for the cmd to close. I havent been able to find a solution and i hope someone that actually knows their stuff can teach me a way. im probably just doing something retarded...
  Anyway i have tried multiple things like using subprocess.Propen() and then using pope() to see when it doesnt return "None" also tried stuff like subprocess.run() with subprocess.CompletedProcess() but i just cant get it to work could someone please care to explain if there is a way to do this and that im just doing it wrong ? :)

  Here is an example of what I tried

  p = subprocess.Popen("start ffmpeg -y -i "+DIR+"/post.mp4 -vf scale="+str(nW)+":"+str(nH)+" "+DIR+"/post_r.mp4", shell=True)
  
      while p.poll() is None:
  
          time.sleep(1)
  
          print("alive")
  
      else:
  
          print("cmd exited")

  Also whenever i put shell=False it just breaks instantly and I get this error :
  FileNotFoundError : [WinError 2] The system cannot find the file specified

• stereo_mode=left_right metadata tag vanishes

  19 juillet 2019, par Alexander D.

  I try to add the metadata tag stereo_mode=left_right to a *.mp4 file I want to upload on YT. I use ffmpeg and and either I tried to set it using
  ffmpeg -i in.mp4 -metadata stereo_mode=left_right -codec copy out_met.mp4
  or added it through a metadata txt file like
  ffmpeg -i in.mp4 -i met.txt -map_metadata 1 -codec copy o_met.mp4
  I can add tags like "title" or "artist", that are displayed when I try to retrieve the metadata with
  ffmpeg -i o_met.mp4 -f ffmetadata m.txt
  or
  ffprobe o_met.mp4
  or the mediainfo tool but the f*** stereo_mode tag vanishes and is not shown by any program !!!
  Is it maybe not implemented like documented ?
  http://www.ffmpeg.org/ffmpeg-formats.html#Metadata
  Or is it not supported in avi and mp4 files ? Is it still there but not displayed ?

  while writing the file it is correctly displayed in the console output :
  Output #0, mp4, to ’o_met.mp4’ :
  Metadata :
  title : 3dvideo
  stereo_mode : left_right
  artist : FFmpeg troll team
  encoder : Lavf58.27.103

  but later while retrieving it is not anymore !!!
  Metadata :
  major_brand : isom
  minor_version : 512
  compatible_brands : isomiso2mp41
  title : 3dvideo
  artist : FFmpeg troll team
  encoder : Lavf58.27.103

• Anomalie #2701 (Fermé) : impossible d’installer un dépôt sur un site chez free

  14 mai 2012, par cedric -

  Pour le coup ça concerne peu la team SPIP, et ça n’est pas un défaut de SPIP non plus. A règler du côté de chez Free, donc...