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• Run ffmpeg command line error in android

  27 février 2014, par user3361063

  When i run this code:

  String cmd = mFfmpegInstallPath+" -f image2 -i "+Environment.getExternalStorageDirectory()+"/ffmpeg/img%03d.png "+Environment.getExternalStorageDirectory()+"/tmp/out.mp4";
  Process p = Runtime.getRuntime().exec(cmd);
  

  I got a error:

  Working Directory: null Environment: null

  So how to run ffmpeg command line in android?

• 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\d+)           # fps
                       \sq=(?P\S+)                    # q
                       \s\S+\s+(?P\S+)          # size
                       \stime=(?P\S+)           # time
                       \sbitrate=(?P[\d\.]+) # bitrate
                       """, re.X)
  
  durationReo = ('(?<=Duration:\s)\S+(?=,)')
  
  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 'Duration:', durationLine
  

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

  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

• FFmpeg LGPL build

  27 février 2014, par user1149520

  Hello I'm trying to build ffmpeg under the LGPL license but I'm having trouble creating the dll's.

  I'm building the source on the Windows platform using MinGW and I use the configure options below to build the latest snapshot

  ./configure --enable-memalign-hack --enable-pthreads --disable-shared
  

  However when I make and install from this I only get the "avdevice-53.dll" and none of the others such as avcodec or avformat. Is there something else I need to do to be able to make these files?

• FFMpeg Can't find libvorbis under Windows

  27 février 2014, par Water Lin

  I try to use FFMpeg to generate MKV video format. By default, FFMpeg will using h264 & libvorbis. But when I using the doc/examples/muxing.c under ffmpeg source file folder, there is always an error:

  [libvorbis @ 002e52a0] Specified sample format s16 is invalid or not supported
  Could not open audio codec: Error number -22 occurred
  

  I used Zeranoe FFmpeg and showed this error. I also tried to compile the ffmpeg from source under MinGW, and I also enable the libvorbis by following comfiguration:

  $ ./configure --prefix=/mingw --enable-libvpx --enable-libvorbis --enable-shared --enable-static
  

  Before I make, I also install libvorbis, libogg, yasm etc. But the error is still there.

  If I use the ffmpeg.exe to convert video to webm format, it works. The command is like following:

  ffmpeg -i test.h264 -vcodec libvpx -acodec libvorbis output.webm
  

  The generated output.webm can be played by Firefox or something else. So I think the compiled ffmpeg library is OK. But why I can't generate webm file in muxing.c code?

• Building ffmpeg on Windows

  27 février 2014, par Niranjan

  I've the source code of ffmpeg and would like to build it in my win7. I've minGW installed on my machine. I found a step by step instruction from this link:

  http://www.gooli.org/blog/building-ffmpeg-for-windows-with-msys-and-mingw/

  The link 'Download updated bash for MSYS' did not follow. It showed the file is not found. When I try to build the program the way explained in the site, it shows an error:

  Unknown option “–extra-cflags=-mno-cygwin”. See ./configure –help for available options. ./myconfig: –extra-ldflags=-Wl,–add-stdcall-alias: command not found ./myconfig: –target-os=mingw32: command not found

  From a similar question posted here, I followed the link http://ffmpeg.arrozcru.org/ but the static build downloaded from the site was corrupted. Pls help.