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• Why the bitrate shown during processing differs so much from the final bitrate after processing using ffmpeg ?

  28 juillet 2016, par rpgmaker

  Using ffmpeg, why the bitrate shown during processing differs so much from the final bitrate after processing ?

  This command on a 1080p source :

  ffmpeg -i "$name" -i "$subname" -map 0 -map 1 -vf scale=-1:720 -c:v libx264 -preset veryslow -crf 21 -c:a aac -b:a 256k -c:s:0 srt -disposition:s:0 default -metadata:s:s:0 language=eng -metadata:s:v:0 title="$title" "$new"

  Shows this output :
  

  Which essentially averages 1300-1400 kBit/s. But when I calculate the bitrate of the resulting video using mkvinfo -t the bitrate shown sits at 970-1000 kBit/s and that’s not even close to averaging the 1300 kBit/s shown throughout processing. What is causing the disparity ?

• Anomalie #4189 (Nouveau) : extraire_multi mélange un /li /ul final avec le de langue ajouté...

  5 octobre 2018, par jluc -

  Quand la langue de la chaîne n’est pas la langue désirée,
  extraire_multi appelle code_echappement qui insère

  au début, ok,
  mais qui colle aussi un

  immédiatement à la fin.

  En général c’est OK, mais pas quand la dernière ligne du texte est le dernier item d’une énumération,
  car alors ce ajouté est pris comme partie prenante de cette dernière ligne par l’appel suivant à propre,
  et le HTML qui sort de ce |propre sera mal emboité car il finira par au lieu de

  Cf #4187

  Dans le cas où le texte se termine par une liste, il faut insérer \n\n pour s’assurer que le /div ajouté par code_echappement reste en dehors de la liste.

  Cf simulation avec https://zone.spip.net/trac/spip-zone/changeset/111853/spip-zone

  Et pour corriger, dans le corps de extraire_multi (https://core.spip.net/projects/spip/repository/entry/spip/ecrire/inc/filtres.php#L1595 ),
  il faut insérer 2 fins de lignes quand ça se termine par /ul,
  entre les 2 lignes suivantes :
  

  <span class="CodeRay">    <span class="local-variable">$mode</span> = <span class="predefined">preg_match</span>(<span class="string"><span class="delimiter">'</span><span class="content">,span><span class="delimiter">'</span></span> . _BALISES_BLOCS . <span class="string"><span class="delimiter">'</span><span class="content">)[>[:space:]],iS</span><span class="delimiter">'</span></span>, <span class="local-variable">$trad_propre</span>) ? <span class="string"><span class="delimiter">'</span><span class="content">div</span><span class="delimiter">'</span></span> : <span class="string"><span class="delimiter">'</span><span class="content">span</span><span class="delimiter">'</span></span>;
      <span class="local-variable">$trad</span> = code_echappement(<span class="local-variable">$trad</span>, <span class="string"><span class="delimiter">'</span><span class="content">multi</span><span class="delimiter">'</span></span>, <span class="predefined-constant">false</span>, <span class="local-variable">$mode</span>);
  </span></span>
  Télécharger

  Ce qui donne :
  

  <span class="CodeRay">    <span class="local-variable">$mode</span> = <span class="predefined">preg_match</span>(<span class="string"><span class="delimiter">'</span><span class="content">,span><span class="delimiter">'</span></span> . _BALISES_BLOCS . <span class="string"><span class="delimiter">'</span><span class="content">)[>[:space:]],iS</span><span class="delimiter">'</span></span>, <span class="local-variable">$trad_propre</span>) ? <span class="string"><span class="delimiter">'</span><span class="content">div</span><span class="delimiter">'</span></span> : <span class="string"><span class="delimiter">'</span><span class="content">span</span><span class="delimiter">'</span></span>;
      <span class="keyword">if</span> (<span class="local-variable">$mode</span>==<span class="string"><span class="delimiter">'</span><span class="content">div</span><span class="delimiter">'</span></span> <span class="keyword">and</span> (<span class="predefined">substr</span>(<span class="predefined">rtrim</span>(<span class="local-variable">$trad_propre</span>), -<span class="integer">5</span>)==<span class="string"><span class="delimiter">'</span><span class="content"></span><span class="delimiter">'</span></span>)
          <span class="local-variable">$trad</span> .= <span class="string"><span class="delimiter">"</span><span class="char">\n</span><span class="char">\n</span><span class="delimiter">"</span></span>;
      <span class="local-variable">$trad</span> = code_echappement(<span class="local-variable">$trad</span>, <span class="string"><span class="delimiter">'</span><span class="content">multi</span><span class="delimiter">'</span></span>, <span class="predefined-constant">false</span>, <span class="local-variable">$mode</span>);
  </span></span>
  Télécharger

• Getting realtime output of ffmpeg with pexpect or winpexpect

  27 février 2014, par Shuman

  hi i'm trying to get the progress info when calling ffmpeg command line tool, with pexpect, i can get the progress with regex, but the problem is after a few seconds, maybe 20 or 10sec, pexpect stops getting new print outs from ffmpeg, it's still running, i saw the output file size growing. am i doing something wrong ?

  cmd = 'ffmpeg -i rtmp://xxxx -c copy -absf aac_adtstoasc /usr/tmp/tmp/out.mp4'
  
  
  
  import os
  
  import re
  
  import time
  
  import subprocess 
  
  
  
  
  
  import pexpect
  
  
  
  thread = pexpect.spawn(cmd)
  
  
  
  print 'started'
  
  
  
  reo = re.compile("""\S+\s+(?P\d+)  # frame
  
                       \s\S+\s+(?P<fps>\d+)           # fps
  
                       \sq=(?P<q>\S+)                    # q
  
                       \s\S+\s+(?P<size>\S+)          # size
  
                       \stime=(?P<time>\S+)           # time
  
                       \sbitrate=(?P<bitrate>[\d\.]+) # bitrate
  
                       """, re.X)
  
  
  
  durationReo = (&#39;(?&lt;=Duration:\s)\S+(?=,)&#39;)
  
  
  
  cpl = thread.compile_pattern_list([
  
      pexpect.EOF,
  
      reo,
  
      durationReo
  
  ])
  
  
  
  
  
  while True:
  
      i = thread.expect_list(cpl, timeout=None)
  
      if i == 0: # EOF
  
          print "the sub process exited"
  
          break
  
      elif i == 1:
  
          frame_number = thread.match.group(0)
  
          print frame_number
  
      elif i == 2:
  
          durationLine = thread.match.group(0).strip()
  
          print &#39;Duration:&#39;, durationLine
  
  </bitrate></time></size></q></fps>

  the output is

  started                                                                                   
  
  Duration: 03:55:42.00                                                                     
  
  frame=   74 fps= 55 q=-1.0 size=     984kB time=00:00:06.17 bitrate=1304.5                
  
  frame=   89 fps= 43 q=-1.0 size=    1197kB time=00:00:07.43 bitrate=1319.8                
  
  frame=  113 fps= 41 q=-1.0 size=    1407kB time=00:00:09.33 bitrate=1234.8
  
  frame=  125 fps= 32 q=-1.0 size=    1613kB time=00:00:10.35 bitrate=1275.6
  
  frame=  132 fps= 29 q=-1.0 size=    1705kB time=00:00:10.95 bitrate=1274.7
  
  frame=  135 fps= 26 q=-1.0 size=    1825kB time=00:00:11.23 bitrate=1330.6
  
  frame=  140 fps= 24 q=-1.0 size=    2022kB time=00:00:11.60 bitrate=1426.5
  
  frame=  140 fps= 21 q=-1.0 size=    2097kB time=00:00:11.70 bitrate=1467.7
  
  frame=  142 fps= 19 q=-1.0 size=    2224kB time=00:00:11.79 bitrate=1544.4
  
  frame=  143 fps= 17 q=-1.0 size=    2447kB time=00:00:11.98 bitrate=1672.8
  
  frame=  145 fps= 16 q=-1.0 size=    2687kB time=00:00:12.07 bitrate=1822.8
  
  frame=  155 fps= 15 q=-1.0 size=    2780kB time=00:00:12.95 bitrate=1757.6
  
  frame=  163 fps= 15 q=-1.0 size=    2940kB time=00:00:13.65 bitrate=1764.2
  
  frame=  167 fps= 14 q=-1.0 size=    3062kB time=00:00:13.83 bitrate=1812.3
  
  frame=  168 fps= 13 q=-1.0 size=    3149kB time=00:00:14.02 bitrate=1839.4
  
  frame=  190 fps= 14 q=-1.0 size=    3322kB time=00:00:15.78 bitrate=1723.6
  
  frame=  213 fps= 15 q=-1.0 size=    3481kB time=00:00:17.78 bitrate=1603.4
  
  frame=  235 fps= 16 q=-1.0 size=    3671kB time=00:00:19.59 bitrate=1534.3
  
  frame=  244 fps= 16 q=-1.0 size=    3790kB time=00:00:20.29 bitrate=1530.0
  
  frame=  256 fps= 16 q=-1.0 size=    3909kB time=00:00:21.31 bitrate=1502.1
  
  frame=  276 fps= 16 q=-1.0 size=    4029kB time=00:00:22.94 bitrate=1438.8
  
  frame=  299 fps= 17 q=-1.0 size=    4177kB time=00:00:24.93 bitrate=1372.1
  
  frame=  339 fps= 19 q=-1.0 size=    4388kB time=00:00:28.28 bitrate=1270.9
  
  frame=  363 fps= 19 q=-1.0 size=    4557kB time=00:00:30.18 bitrate=1236.8
  
  frame=  405 fps= 20 q=-1.0 size=    4587kB time=00:00:33.76 bitrate=1113.1
  
  frame=  421 fps= 20 q=-1.0 size=    4598kB time=00:00:35.15 bitrate=1071.4

  it stops here but the code is still running. the file size is still growing and the code didn't exit, so it's not because of the timeout bug in pexpect.

  and also , if user press ctrl+c to terminate the main program, ffmpeg still runs in the bg, how do i also tell it to exit ?

  edit : i found that the culprit might be ffmpeg is not printing out all the info after 10 lines or so. it only update the display where it needs to be changed.so the regex is not matching, so what to do now , make 6 seperate regex ?

  edit2 : it seems if i use this regex, it works...

  reo = re.compile("""frame=\s*(?P\d+)  # frame
  
                       \sfps=\s*(?P<fps>\d+)           # fps
  
                       \sq=\s*(?P<q>\S+)                    # q
  
                       \ssize=\s*(?P<size>\S+)          # size
  
                       \stime=\s*(?P<time>\S+)           # time
  
                       \sbitrate=\s*(?P<bitrate>[\d\.]+) # bitrate
  
                       """, re.X)
  
  </bitrate></time></size></q></fps>

  it's saying only match when frame number is updated, ( maybe this implies all the other text are also updated ? )

  edit3 : in linux it's working, but under windows, i don't know how to get it to work with this latest forked winpexpect

  basically i'm using the same code

  import winpexpect
  
  thread = winpexpect.winspawn(cmd,timeout=99999999999 )

  there is another problem winpexpect.EOF seems not working, every new line caused a match