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• ffmpeg hangs when run in a multi-threaded environment

  3 février 2018, par Zaid Amir

  I have a service that needs to transcode large amount of videos with different formats. The service spawns five threads, one for a single video and each thread runs ffmpeg with the following command :

  ffmpeg -i %%FILEPATH%% -vf scale=X:Y -ab 128k -c:a aac -movflags faststart -strict -2 -ar 22050 -r 24 -c:v libx264 -crf 25 -y %%OUTPUT.MP4%%

  where X and Y are the desired dimensions based on the orientation of the original file basically its either 640:trunc(ow*a/2)*2 for landscape or trunc(oh*a/2)*2:640 for portrait.

  This is my ffmpeg info :

  ffmpeg version 2.4.3-1ubuntu1~trusty6 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Nov 22 2014 17:07:19 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  
    configuration: --prefix=/usr --extra-version='1ubuntu1~trusty6' --build-suffix=-ffmpeg --toolchain=hardened --extra-cflags= --extra-cxxflags= --libdir=/usr/lib/x86_64-linux-gnu --shlibdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-fontconfig --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-opengl --enable-x11grab --enable-libxvid --enable-libx265 --enable-libdc1394 --enable-libiec61883 --enable-libzvbi --enable-libzmq --enable-frei0r --enable-libx264 --enable-libsoxr --enable-openal --enable-libopencv
  
    libavutil      54.  7.100 / 54.  7.100
  
    libavcodec     56.  1.100 / 56.  1.100
  
    libavformat    56.  4.101 / 56.  4.101
  
    libavdevice    56.  0.100 / 56.  0.100
  
    libavfilter     5.  1.100 /  5.  1.100
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  0.100 /  3.  0.100
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  0.100 / 53.  0.100
  
  Hyper fast Audio and Video encoder
  
  usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

  The service is written in Java and running on Ubuntu Server 14.04 and the machine is an 64-bit octa-core server.

  This is the code block that executes ffmpeg :

  try 
  
  {
  
      ProcessBuilder procBuilder = null;
  
  
  
  
  
      String sArgs = String.format("ffmpeg -i %s -vf scale=%s:%s -ab 128k -c:a aac -movflags faststart -strict -2 -ar 22050 -r 24 -c:v libx264 -crf 25 -y %s",
  
                  originalPath,
  
                  outWidth,
  
                  outHeight,
  
                  targetPath
  
          );
  
  
  
      }
  
  
  
      String[] arrArgs = sArgs.split("\\s+");
  
      procBuilder = new ProcessBuilder(Arrays.asList(arrArgs));
  
      procBuilder.redirectErrorStream(true);
  
     procBuilder.redirectOutput();
  
  
  
  
  
      Process process = procBuilder.start();
  
  
  
      try (BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()))) 
  
      {
  
          String line = null;
  
          while ((line = reader.readLine()) != null) 
  
          {
  
              System.out.println(line);
  
          }
  
          errorCode = process.waitFor();
  
      }
  
  }
  
  catch(Throwable ex)
  
  {
  
  }

  I am currently spawning five threads, and each thread runs a single instance of ffmpeg targeting a single video file. This works fine most of the time, but every once in a while threads start to hang. I noticed from top that ffmpeg hangs indefinitely on some files with one of the threads using 100% of the core CPU and no progress is made. It happened with different file types as I noticed this on mkv, avi, wmv and mp4 files.

  I am not sure what is causing ffmpeg to hang, it does not happen right at the beginning of the transcoding process, ffmpeg starts converting the file fine but somewhere in the middle it gets stuck.

  Now this is not a problem with the files as when I try the same command on the same file manually it runs fine. And it only seems to happen when there are multiple instances of ffmpeg running at the same time as I now changed my service to only run a single thread and it has been running for almost a month with no issues.

  Is there an option that I need to use to allow multiple instances of ffmpeg to run at the same time ? Is it something in the command line that I currently use that causes this ?

• Error when initializing webcam with ffmpeg

  29 janvier 2018, par Daniel

  I am trying to set up a webcam and stream to localhost, using ffmpeg.

  Here is a command I put into a terminal :

  ffmpeg -f alsa -ac 2 -i hw:1,0 -f v4l2 -s 1280x720 -r 10 -i /dev/video1 -vcodec libx264 -pix_fmt yuv420p -preset ultrafast -r 25 -g 20 -b:v 2500k -codec:a libmp3lame -ar 44100 -threads 6 -b:a 11025 -bufsize 512k -f flv rtmp://localhost:80/

  And here is what happened :

  ffmpeg version 2.8.11-0ubuntu0.16.04.1 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1 16.04.4) 20160609
  configuration : —prefix=/usr —extra-version=0ubuntu0.16.04.1 —build-suffix=-ffmpeg —toolchain=hardened —libdir=/usr/lib/x86_64-linux-gnu —incdir=/usr/include/x86_64-linux-gnu —cc=cc —cxx=g++ —enable-gpl —enable-shared —disable-stripping —disable-decoder=libopenjpeg —disable-decoder=libschroedinger —enable-avresample —enable-avisynth —enable-gnutls —enable-ladspa —enable-libass —enable-libbluray —enable-libbs2b —enable-libcaca —enable-libcdio —enable-libflite —enable-libfontconfig —enable-libfreetype —enable-libfribidi —enable-libgme —enable-libgsm —enable-libmodplug —enable-libmp3lame —enable-libopenjpeg —enable-libopus —enable-libpulse —enable-librtmp —enable-libschroedinger —enable-libshine —enable-libsnappy —enable-libsoxr —enable-libspeex —enable-libssh —enable-libtheora —enable-libtwolame —enable-libvorbis —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx265 —enable-libxvid —enable-libzvbi —enable-openal —enable-opengl —enable-x11grab —enable-libdc1394 —enable-libiec61883 —enable-libzmq —enable-frei0r —enable-libx264 —enable-libopencv
  libavutil 54. 31.100 / 54. 31.100
  libavcodec 56. 60.100 / 56. 60.100
  libavformat 56. 40.101 / 56. 40.101
  libavdevice 56. 4.100 / 56. 4.100
  libavfilter 5. 40.101 / 5. 40.101
  libavresample 2. 1. 0 / 2. 1. 0
  libswscale 3. 1.101 / 3. 1.101
  libswresample 1. 2.101 / 1. 2.101
  libpostproc 53. 3.100 / 53. 3.100

  ALSA lib pcm_hw.c:1700 :(_snd_pcm_hw_open) Invalid value for card

  [alsa @ 0x21c45c0] cannot open audio device hw:1,0 (No such file or directory)

  hw:1,0 : Input/output error

• Missing ffmpeg in deployed application

  30 décembre 2017, par Dexstrum

  I have created a python GUI which utilizes ffmpy and tkinter. It works fine running in PyCharm and also in py2app’s alias mode. After I deployed it using py2app and ran the program, it loaded up, but nothing happened. After doing some digging, I found that the error was ’ffmpeg executable is missing.’

  I tried using pyinstaller to remedy the issue, but the application did not even run.

  The warning.txt output file gave me this :

  missing module named org - imported by copy
  
  missing module named _sha512 - imported by hashlib
  
  missing module named _sha256 - imported by hashlib
  
  missing module named _md5 - imported by hashlib
  
  missing module named _sha - imported by hashlib
  
  missing module named 'org.python' - imported by pickle, xml.sax
  
  missing module named _subprocess - imported by subprocess
  
  missing module named msvcrt - imported by subprocess, getpass, youtube_dl.utils
  
  missing module named riscosenviron - imported by os
  
  missing module named riscospath - imported by os
  
  missing module named riscos - imported by os
  
  missing module named ce - imported by os
  
  missing module named _emx_link - imported by os
  
  missing module named os2 - imported by os
  
  missing module named nt - imported by os, ntpath
  
  missing module named 'urllib.parse' - imported by pafy.util, youtube_dl.compat, pafy.backend_internal, pafy.backend_shared, pafy.playlist
  
  missing module named _winreg - imported by mimetypes, urllib, winreg, platform
  
  missing module named OverrideFrom23 - imported by Carbon.Res
  
  missing module named SOCKS - imported by ftplib
  
  missing module named rourl2path - imported by urllib
  
  missing module named _dummy_threading - imported by dummy_threading
  
  missing module named 'urllib.error' - imported by pafy.pafy, pafy.util, youtube_dl.compat, pafy.backend_shared
  
  missing module named 'urllib.request' - imported by pafy.g, youtube_dl.compat, pafy.backend_shared
  
  missing module named ElementC14N - imported by xml.etree.ElementTree
  
  missing module named 'java.lang' - imported by platform, xml.sax._exceptions
  
  missing module named _xmlplus - imported by xml
  
  missing module named sgi - imported by pty
  
  missing module named vms_lib - imported by platform
  
  missing module named java - imported by platform
  
  missing module named winreg.HKEY_LOCAL_MACHINE - imported by winreg, platform
  
  missing module named winreg.CloseKey - imported by winreg, platform
  
  missing module named winreg.QueryValueEx - imported by winreg, platform
  
  missing module named winreg.OpenKeyEx - imported by winreg, platform
  
  missing module named win32pipe - imported by platform
  
  missing module named netbios - imported by uuid
  
  missing module named win32wnet - imported by uuid
  
  missing module named lazy_extractors - imported by youtube_dl.extractor
  
  missing module named Crypto - imported by youtube_dl.downloader.hls
  
  missing module named xattr - imported by youtube_dl.utils
  
  missing module named 'dbm.ndbm' - imported by future.moves.dbm.ndbm
  
  missing module named gdbm - imported by anydbm, future.moves.dbm.gnu
  
  missing module named 'dbm.gnu' - imported by future.moves.dbm.gnu
  
  missing module named 'dbm.dumb' - imported by future.moves.dbm.dumb
  
  missing module named bsddb3 - imported by bsddb
  
  missing module named _pybsddb - imported by bsddb, bsddb.db
  
  missing module named 'test.support' - imported by future.moves.test.support
  
  missing module named reprlib.recursive_repr - imported by reprlib, future.backports.misc
  
  missing module named _thread.get_ident - imported by _thread, future.backports.misc
  
  missing module named _datetime - imported by future.backports.datetime
  
  missing module named 'urllib.response' - imported by youtube_dl.compat

  I am not sure where to go from here. I don’t know how to include ffmpeg into the deployed application, and when I include the modules in the setup.py file it throws me a different error. Is there a reason why the py2app is not deploying the application with ffmpeg ?