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• h264_parser : don’t stop on SPS_EXT in split

  31 octobre 2014, par John Stebbins

  h264_parser : don’t stop on SPS_EXT in split
  Add SPS_EXT, SEI, and subset SPS to codes that are skipped during split.
  
  These codes can come before the PPS and results in incomplete extradata.
  

  • [DBH] libavcodec/h264_parser.c

• Python subprocess : capture output of ffmpeg and run regular expression against it

  31 décembre 2014, par Jesse Adam

  I have the following code

  import subprocess
  
  import re
  
  from itertools import *
  
  
  
  command = ['ffprobe', '-i', '/media/some_file.mp4']
  
  p = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  
  text = p.stderr.read()
  
  retcode = p.wait()
  
  text = text.decode('utf-8')
  
  p = re.compile("Duration(.*)")
  
  
  
  num = 0 #for debugging
  
  for line in iter(text.splitlines()):
  
      print(str(num) + line) #for debugging
  
      m = p.match(str(line))
  
      if m != None:
  
          print(m.group(1))

  When I look at the output there is a line that says "Duration" on it, however it is not captured, print(m.group(1)) is never reached. If I change the text variable to a hardcoded string of "Duration blahblah" I get " blahblah", which is what I expect. It seems like the regex doesn’t recognize the text coming back from stderr. How can I get the text into a format that the regex will recognize and match on ?

  ---

  I have come up with the following solution, should it help anyone else attempting to capture duration from ffmpeg using python

  import subprocess
  
  import re
  
  
  
  command = ['ffprobe', '-i', '/media/some_file.mp4']
  
  p = subprocess.Popen(command, stderr=subprocess.PIPE)
  
  text = p.stderr.read()
  
  retcode = p.wait()
  
  text = text.decode('utf-8')
  
  p = re.compile(".*Duration:\s([0-9:\.]*),", re.MULTILINE|re.DOTALL)
  
  m = p.match(text)
  
  print(m.group(1))

• kdenlive - Get stuck when stop capture

  9 janvier 2015, par Eduardo Ramos

  I am having problems with kdenlive to capture my webcam with ffmpeg. My environment :

  • Slackware 14.1 (current) ;
  • mlt-0.9.0-x86_64-2_SBo ;
  • ffmpeg-2.1.5-x86_64_custom-1_SBo ;
  • kdenlive-0.9.8-x86_64-1_SBo.

  My procedure :

  Go to ’Record Monitor’ tab, click on ’record’ button. The preview works very well. Some seconds later, I click on ’stop’ button, then it get stuck. That moment, my webcam remains active too.

  When I check my working folder /tmp/kdenlive, it appeared capture0000.mpg file. I can play normally with mplayer. So it seems kdenlive is working with capture and encode.

  My kdenlive capture configuration :

  • device : /dev/video0
  • Size : 160x120
  • Frame rate : 30/1

  • Alsa capture : checked

  • Encoding profile : Normal MPEG :

    f=mpeg acodec=mp2 ab=128k ar=48000 vcodec=mpeg2video minrate=0 vb=4000k