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Sur d’autres sites (9132)

  • 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

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