Recherche avancée

Sur d’autres sites (7852)

• How can I extract the metadata and bitrate info from a audio/video file in python

  4 janvier 2015, par Fight Fire With Fire

  What I would like to do is get the metadata from audio or video files and save it to a database record, so far the only way to do this seems to save AVCONV/FFMPEG to a file using a subprocess.Open call then read that file, is there any libraries that can do this to save some steps ? I couldn’t find a way to do it with Pydub or PySox. Here is my simplistic hamfisted beginner code I used that does work and puts the bitrate, duration, etc info into a variable audio_info and the metadata into metadata. OGG output worked differently than the other formats i tested (which was a ton of video and audio !).

      try:
  
              p = subprocess.Popen(["avconv" , "-i" , music_file], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  
              out, err = p.communicate()
  
              retcode = p.wait()
  
      except IOError,e:
  
              pass
  
      extension = uploaded_music_file[-3:]
  
      if "ogg" not in [err , extension]:
  
              if "Metadata:" in err:
  
                      list = err.split("Metadata:")
  
                      holder = list[1].split("Duration:")
  
                      metadata = holder[0]
  
                      audio_info = holder[1].replace("At least one output file must be specified","")
  
                      print metadata
  
                      print audio_info
  
              else:
  
                      list = err.split("Duration:")
  
                      audio_info = list[1].replace("At least one output file must be specified","")
  
                      print "No Metadata"
  
                      print audio_info
  
      else:
  
              list = err.split("Duration:")
  
              if "Metadata:" in list[1]:
  
                      data = list[1].split("Metadata:")
  
                      metadata = data[1].replace("At least one output file must be specified","")
  
                      audio_info = data[0]
  
                      print metadata
  
                      print audio_info
  
              else:
  
                      audio_info = list[1].replace("At least one output file must be specified","")
  
                      print "No Metadata"
  
                      print audio_info
  
  if (audio_info):
  
              print "AUDIO INFO:"
  
              cursor.execute("UPDATE songDB SET audio_info = %s WHERE id = %s" ,[ audio_info , song_id ] )
  
              if (metadata):
  
                      print "METADATA:"
  
                      cursor.execute("songDB pack_song SET metadata = %s WHERE id = %s" ,[ metadata , song_id ] )

• avformat/hlsenc : free variant streams after write all variant streams info

  22 décembre 2018, par Steven Liu

  avformat/hlsenc : free variant streams after write all variant streams info
  fix ticket : 7631
  Signed-off-by : Steven Liu <lq@chinaffmpeg.org>
  

  • [DH] libavformat/hlsenc.c

• Extract keyframe info and byte offset from video ffmpeg/ffprobe

  4 juin 2020, par Ali Hasan

  How can I retrieve each keyframe information from the video using ffmpeg/ffprobe.

  



  I have read a lot stackoverflow questions and answers regarding this but the command only returns the keyframe duration.

  



  I have used this command to extract the keyframe duration

  



  ffprobe -loglevel error -skip_frame nokey -select_streams v:0 -show_entries frame=pkt_pts_time -of csv "/var/www/html/YoutubeTesting/1080p.mp4"


  



  But the info which I need from each keyframe are

  



  1- Byte offset from video byte size

  



  2- Duration of keyframe

  



  Thanks !