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• 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

• Revision 7f17b2e476 : gen_msvs_vcxproj.sh : Set TargetName instead of OutputFile. Set TargetName for l

  20 février 2014, par Tom Finegan

  Changed Paths :
   Modify /build/make/gen_msvs_vcxproj.sh

  
  
  gen_msvs_vcxproj.sh : Set TargetName instead of OutputFile.

  Set TargetName for library builds instead of changing the value of
  OutputFile.

  This fixes the following warnings :
  warning MSB8012 : TargetPath does not match Library's OutputFile property
  value.

  Change-Id : I4320b6d9ea922d3a15b9823c7c6694ee33edbf45

• batch ffmpeg conversion (aspect, crop, and concatenate) and naming based on subfolder

  3 avril 2015, par hordor

  TYIA for any help !

  Seems I have a somewhat complicated, multi-step process. If you can help any part of it that would be appreciated.

  What I hope to accomplish

  1. Example of folder/file is here : https://mega.co.nz/#F !RJRWRLTJ !c6b-z3Vl-Tlh0uGbCflx7Q
  2. I have many subfolders that each contain 7 files from a DVD (originally PAL-encoded I think). I only care about the VTS_01_1.VOB AND VTS_01_2.VOB files. The two files together are one match
  3. The videos are stretched (from 4:3 to 16:9) and letterboxed. I want to undo that
  4. The future title of the final MP4 video should be the name of the folder
  5. BONUS : title of the video should also include the folder before it (e.g. "Friday H2 G1 CAN - BEL.mp4")

  I’d like to do this via batch file because there are a lot of folders.

  What I have done :

  dir/b/s *.vob | findstr /v VIDEO | findstr /v 01_ >list.txt
  
  
  
  @echo off
  
  for %%i in list.txt 
  
  do   
  
    ffmpeg -i VTS_01_1.VOB -aspect 4:3 "%%~pi\v1step1.mp4"
  
    ffmpeg -i vob1.mp4 -vf "crop=704:432:10:72" "%%~pi\v1step2.mp4"
  
    ffmpeg -i vob11.mp4 -c copy "%%~pi\v1step3.ts"
  
    ffmpeg -i VTS_01_2.VOB -aspect 4:3 "%%~pi\v2step1.mp4"
  
    ffmpeg -i vob2.mp4 -vf "crop=704:432:10:72" "%%~pi\v2step2.mp4"
  
    ffmpeg -i vob22.mp4 -bsf h264_mp4toannexb -c copy "%%~pi\v2step3.ts"
  
    ffmpeg -i "concat:v1step3.ts|v2step3.ts" -c copy file.mp4 "%%~pi\Match.mp4"
  
  
  
  @echo on
  
  pause

  Problem with current code

  1. Doesn’t start converting (can’t see error message either)
  2. Doesn’t have the file naming that I want
  3. A lot of steps in conversation - can that be simplified ?
  4. Not sure why it wanted the -bsf command for the second conversion but not the first

  Apologies if I’d made basic mistakes. I’m a big newbie and just to get this far has taken me hours of research. Thanks again !