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• Killing python ffmpeg subprocess breaks cli output

  27 septembre 2017, par JayLev

  I’m trying to execute a system command with subprocess and reading the output.

  But if the command takes more than 10 seconds I want to kill the subprocess.

  I’ve tried doing this in several ways.

  My last try was inspired by this post : https://stackoverflow.com/a/3326559/969208

  Example :

  import os
  
  import signal
  
  from subprocess import Popen, PIPE
  
  
  
  class Alarm(Exception):
  
      pass
  
  
  
  def alarm_handler(signum, frame):
  
      raise Alarm
  
  
  
  def pexec(args):
  
  
  
      p = Popen(args, stdout=PIPE, stderr=PIPE)
  
  
  
      signal.signal(signal.SIGALRM, alarm_handler)
  
      signal.alarm(10)
  
  
  
      stdout = stderr = ''
  
      try:
  
          stdout, stderr = p.communicate()
  
          signal.alarm(0)
  
      except Alarm:
  
          try:
  
              os.kill(p.pid, signal.SIGKILL)
  
          except:
  
              pass
  
  
  
      return (stdout, stderr)

  The problem is : After the program exits no chars are shown in the cli until I hit return. And hitting return will not give me a new line.

  I suppose this has something to do with the stdout and stderr pipe.

  I’ve tried flushing and reading from the pipe (p.stdout.flush())

  I’ve also tried with different Popen args, but might’ve missed something. Just thought I’d keep it simple here.

  I’m running this on a Debian server.

  Am I missing something here ?

  EDIT :

  It seems this is only the case when killing an ongoing ffmpeg process. If the ffmpeg process exits normally before 10 seconds, there is no problem at all.

  I’ve tried executing a couple of different command that take longer than 10 seconds, one who prints output, one who doesn’t and a ffmpeg command to check the integrity of a file.

  args = ['sleep', '12s'] # Works fine
  
  args = ['ls', '-R', '/var'] # Works fine, prints lots for a long time
  
  args = ['ffmpeg', '-v', '1', '-i', 'large_file.mov','-f', 'null', '-'] # Breaks cli output

  I believe ffmpeg prints using \r and prints everything on the strerr pipe. Can this be the cause ? Any ideas how to fix it ?

• Discord Bot Not Playing Audio When Using YouTube-dl and FFmpeg

  5 novembre 2020, par John Henry 5

  I'm trying to get a bot to join a voice chat and then play the audio in a youtube url. This is the code I have :

  


  @client.command() async def play(ctx):
    channel = ctx.message.author.voice.channel
    voice_client = await channel.connect()

    opts = {'format': 'bestaudio'}
    FFMPEG_OPTIONS = {'before_options': '-reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 5', 'options': '-vn'}
    with youtube_dl.YoutubeDL(opts) as ydl:
        song_info = ydl.extract_info('video', download=False)
        URL = song_info['formats'][0]['url']
    voice_client.play(FFmpegPCMAudio(URL, **FFMPEG_OPTIONS))


  


  No errors are thrown but it just says [youtube] video : Downloading webpage

  


• Revision 74593c1eae : Directly split the block in partition search This patch allows the encoder to d

  5 août 2014, par Pengchong Jin

  Changed Paths :
   Modify /vp9/encoder/vp9_encodeframe.c

  
  
  Directly split the block in partition search

  This patch allows the encoder to directly split the block
  in partition search, therefore skip searching NONE. It
  computes a score which measures whether 16x16 motion vectors
  from the first pass in the current block are consistent with
  each others. If they are inconsistent and we have enough Q
  to encode, split the block directly, and skip searching NONE.

  This feature is under flag CONFIG_FP_MB_STATS. In speed 2,
  it further gives a speedup of 3-8% on sample yt clips as
  compared to the previous version under the same flag. Overall,
  the features under the flag will give 7-15% on typical yt
  clips at up to 6000kbps data rate. The speedup at very high
  data rate is not significant.

  For hard stdhd clips :
  park_joy_1080p @ 15000kbps : 504541ms -> 506293ms (-0.35%)
  pedestrian_area_1080p @ 2000kbps : 326610ms -> 290090ms (+11.2%)

  The compression performance using the features under the flag :
  derf : -0.068%
  yt : -0.189%
  hd : -0.318%
  stdhd :-0.183%

  To use the feature, set CONFIG_FP_MB_STATS and turn on
  cpi->use_fp_mb_stats.

  Change-Id : Iad58a2966515c8861aa9eb211565b1864048d47f