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• Opening Video with opencv3 and python on Amazon EC2

  11 octobre 2016, par stml

  I successfully set up python and opencv3 on an t2.micro instance by following these instructions : http://stackoverflow.com/a/38867965/1213715

  The script which worked on my local machine no longer works. The problem seems to be with importing video. The start of my code now looks like this :

  import numpy as np
  
  import cv2
  
  
  
  cap = cv2.VideoCapture('/home/ec2-user/test.mov')
  
  
  
  if(cap.isOpened() == False):
  
      print "Can't open video"
  
      exit()

  This exits every time. I have tried different paths and different video formats (including .avi).

  In other threads, I read that ffmpeg is essential to cv2 video functions, and successfully installed this using the instructions at https://forums.aws.amazon.com/thread.jspa?messageID=524523. I can now run ffmpeg from the command line - but it has not changed the cv2 output.

  Do I need to link ffmpeg to cv2 somehow, or do I need to recompile entirely - and if so, what change should I make to the original installation instructions ?

  Python version 2.7.12

  Opencv version 3.1.0

• Install gstreamer on EC2 Amazon Linux AMI ?

  6 décembre 2015, par vy32

  I’m trying to install QT5.5 on Amazon EC2 Linux, which apparently requires that I install some kind of multimedia support. It looks like that comes from gstreamer.

  yum search gstreamer turns up :

  [ec2-user@ip-172-30-1-58 ~]$ yum search gstreamer
  
  Loaded plugins: priorities, update-motd, upgrade-helper
  
  23 packages excluded due to repository priority protections
  
  ============================================== N/S matched: gstreamer ==============================================
  
  gstreamer-ffmpeg.x86_64 : GStreamer FFmpeg-based plug-ins
  
  gstreamer-ffmpeg-debuginfo.x86_64 : Debug information for package gstreamer-ffmpeg
  
  gstreamer-plugins-bad.x86_64 : GStreamer streaming media framework "bad" plug-ins
  
  gstreamer-plugins-bad-debuginfo.x86_64 : Debug information for package gstreamer-plugins-bad
  
  gstreamer-plugins-bad-nonfree.x86_64 : Non Free GStreamer streaming media framework "bad" plug-ins
  
  gstreamer-plugins-bad-nonfree-debuginfo.x86_64 : Debug information for package gstreamer-plugins-bad-nonfree
  
  gstreamer-plugins-ugly.x86_64 : GStreamer streaming media framework "ugly" plug-ins
  
  gstreamer-plugins-ugly-debuginfo.x86_64 : Debug information for package gstreamer-plugins-ugly
  
  gstreamer-plugins-ugly-devel-docs.noarch : Development documentation for the GStreamer "ugly" plug-ins
  
  gstreamer1-libav.x86_64 : GStreamer 1.0 libav-based plug-ins
  
  gstreamer1-libav-debuginfo.x86_64 : Debug information for package gstreamer1-libav
  
  gstreamer1-plugins-bad-freeworld.x86_64 : GStreamer 1.0 streaming media framework "bad" plug-ins
  
  gstreamer1-plugins-bad-freeworld-debuginfo.x86_64 : Debug information for package gstreamer1-plugins-bad-freeworld
  
  gstreamer1-plugins-ugly.x86_64 : GStreamer 1.0 streaming media framework "ugly" plug-ins
  
  gstreamer1-plugins-ugly-debuginfo.x86_64 : Debug information for package gstreamer1-plugins-ugly
  
  gstreamer1-plugins-ugly-devel-docs.noarch : Development documentation for the GStreamer "ugly" plug-ins
  
  gstreamer1-vaapi.x86_64 : GStreamer plugins to use VA API video acceleration
  
  gstreamer1-vaapi-debuginfo.x86_64 : Debug information for package gstreamer1-vaapi
  
  gstreamer1-vaapi-devel.x86_64 : Development files for gstreamer1-vaapi
  
  qt-gstreamer.x86_64 : C++ bindings for GStreamer with a Qt-style API
  
  qt-gstreamer-debuginfo.x86_64 : Debug information for package qt-gstreamer
  
  qt-gstreamer-devel.x86_64 : Header files and development documentation for qt-gstreamer
  
  
  
    Name and summary matches only, use "search all" for everything.
  
  [ec2-user@ip-172-30-1-58 ~]$ %

  However, when I try to install one of these, I get this error :

  $ sudo yum install -y gstreamer-ffmpeg
  
  Loaded plugins: priorities, update-motd, upgrade-helper
  
  23 packages excluded due to repository priority protections
  
  Resolving Dependencies
  
  --> Running transaction check
  
  ---> Package gstreamer-ffmpeg.x86_64 0:0.10.13-15.el7.nux will be installed
  
  --> Processing Dependency: liborc-0.4.so.0()(64bit) for package: gstreamer-ffmpeg-0.10.13-15.el7.nux.x86_64
  
  --> Processing Dependency: libgstvideo-0.10.so.0()(64bit) for package: gstreamer-ffmpeg-0.10.13-15.el7.nux.x86_64
  
  --> Processing Dependency: libgstreamer-0.10.so.0()(64bit) for package: gstreamer-ffmpeg-0.10.13-15.el7.nux.x86_64
  
  --> Processing Dependency: libgstpbutils-0.10.so.0()(64bit) for package: gstreamer-ffmpeg-0.10.13-15.el7.nux.x86_64
  
  --> Processing Dependency: libgstbase-0.10.so.0()(64bit) for package: gstreamer-ffmpeg-0.10.13-15.el7.nux.x86_64
  
  --> Processing Dependency: libgstaudio-0.10.so.0()(64bit) for package: gstreamer-ffmpeg-0.10.13-15.el7.nux.x86_64
  
  --> Finished Dependency Resolution
  
  Error: Package: gstreamer-ffmpeg-0.10.13-15.el7.nux.x86_64 (nux-dextop)
  
             Requires: liborc-0.4.so.0()(64bit)
  
  Error: Package: gstreamer-ffmpeg-0.10.13-15.el7.nux.x86_64 (nux-dextop)
  
             Requires: libgstreamer-0.10.so.0()(64bit)
  
  Error: Package: gstreamer-ffmpeg-0.10.13-15.el7.nux.x86_64 (nux-dextop)
  
             Requires: libgstbase-0.10.so.0()(64bit)
  
  Error: Package: gstreamer-ffmpeg-0.10.13-15.el7.nux.x86_64 (nux-dextop)
  
             Requires: libgstaudio-0.10.so.0()(64bit)
  
  Error: Package: gstreamer-ffmpeg-0.10.13-15.el7.nux.x86_64 (nux-dextop)
  
             Requires: libgstpbutils-0.10.so.0()(64bit)
  
  Error: Package: gstreamer-ffmpeg-0.10.13-15.el7.nux.x86_64 (nux-dextop)
  
             Requires: libgstvideo-0.10.so.0()(64bit)
  
   You could try using --skip-broken to work around the problem
  
   You could try running: rpm -Va --nofiles --nodigest
  
  [ec2-user@ip-172-30-1-58 ~]$ 

  Supplying the suggested --skip-broken doesn’t help :

  [ec2-user@ip-172-30-1-58 ~]$ sudo yum install -y gstreamer-ffmpeg --skip-broken
  
  Loaded plugins: priorities, update-motd, upgrade-helper
  
  23 packages excluded due to repository priority protections
  
  Resolving Dependencies
  
  --> Running transaction check
  
  ---> Package gstreamer-ffmpeg.x86_64 0:0.10.13-15.el7.nux will be installed
  
  --> Processing Dependency: liborc-0.4.so.0()(64bit) for package: gstreamer-ffmpeg-0.10.13-15.el7.nux.x86_64
  
  --> Processing Dependency: libgstvideo-0.10.so.0()(64bit) for package: gstreamer-ffmpeg-0.10.13-15.el7.nux.x86_64
  
  --> Processing Dependency: libgstreamer-0.10.so.0()(64bit) for package: gstreamer-ffmpeg-0.10.13-15.el7.nux.x86_64
  
  --> Processing Dependency: libgstpbutils-0.10.so.0()(64bit) for package: gstreamer-ffmpeg-0.10.13-15.el7.nux.x86_64
  
  --> Processing Dependency: libgstbase-0.10.so.0()(64bit) for package: gstreamer-ffmpeg-0.10.13-15.el7.nux.x86_64
  
  --> Processing Dependency: libgstaudio-0.10.so.0()(64bit) for package: gstreamer-ffmpeg-0.10.13-15.el7.nux.x86_64
  
  
  
  Packages skipped because of dependency problems:
  
      gstreamer-ffmpeg-0.10.13-15.el7.nux.x86_64 from nux-dextop
  
  [ec2-user@ip-172-30-1-58 ~]$ 

  So how do I install gstreamer-ffmpeg ? Why aren’t the dependencies automatically being followed ?

• What is the right command to convert an mp3 file to the required codec version (MPEG version 2) and bit rate (48 kbps) for Amazon Alexa SSML ?

  6 mai 2017, par Asimov4

  I am trying to convert an mp3 file to the format expected by the audio tag in the Amazon Alexa SSML markup language as described here : https://developer.amazon.com/public/solutions/alexa/alexa-skills-kit/docs/speech-synthesis-markup-language-ssml-reference

  The documentation recommends using https://www.ffmpeg.org/ffmpeg.html

  I tried this command but can’t find the right codec to use :
  ffmpeg -y -i input.mp3 -ar 44100 -ab 48k -codec:a mpeg2 -ac 1 output.mp3

  I know I need to convert the file because Alexa fails with the following error : The audio is not of a supported MPEG version