When I run the following command on Matlab R2017a from CentOS 6.9
v = VideoReader('test.avi');
I get the following error:
Error using VideoReader/init (line 619) The VideoReader plugin libmwgstreamerplugin failed to load properly.
Error in VideoReader (line 172)
obj.init(fileName);
The reason is that old versions of Matlab used to rely on gstreamer-0.10 to process video but from at lease R2014a the dependency of gstreamer library has changed to gstreamer-1.0 if you want to use VideoReader('video.avi') command. So upgrade your OS will be the easiest way to solve this issue but if this is not possible as I am facing, then upgrade the gstreamer library is the only solution.To check which gstreamer you need check the dependencies of Matlab libmwgstreamerplugin.so by readelf command:
# cd /usr/local/MATLAB/R2017a/toolbox/shared/multimedia/bin/glnxa64/reader # readelf -d libmwgstreamerplugin.so Dynamic section at offset 0xd780 contains 43 entries: Tag Type Name/Value 0x0000000000000001 (NEEDED) Shared library: [libmwmultimediacommonexceptions.so] 0x0000000000000001 (NEEDED) Shared library: [libmwtamimframe.so] 0x0000000000000001 (NEEDED) Shared library: [libmwi18n.so] 0x0000000000000001 (NEEDED) Shared library: [libboost_system.so.1.56.0] 0x0000000000000001 (NEEDED) Shared library: [libmwcpp11compat.so] 0x0000000000000001 (NEEDED) Shared library: [libtbb.so.2] 0x0000000000000001 (NEEDED) Shared library: [libtbbmalloc.so.2] 0x0000000000000001 (NEEDED) Shared library: [libgstvideo-1.0.so.0] 0x0000000000000001 (NEEDED) Shared library: [libgstbase-1.0.so.0] 0x0000000000000001 (NEEDED) Shared library: [libgstreamer-1.0.so.0] 0x0000000000000001 (NEEDED) Shared library: [libgobject-2.0.so.0] 0x0000000000000001 (NEEDED) Shared library: [libgmodule-2.0.so.0] 0x0000000000000001 (NEEDED) Shared library: [libgthread-2.0.so.0] 0x0000000000000001 (NEEDED) Shared library: [librt.so.1] 0x0000000000000001 (NEEDED) Shared library: [libxml2.so.2] 0x0000000000000001 (NEEDED) Shared library: [libglib-2.0.so.0] 0x0000000000000001 (NEEDED) Shared library: [libgstapp-1.0.so.0] 0x0000000000000001 (NEEDED) Shared library: [libstdc++.so.6] 0x0000000000000001 (NEEDED) Shared library: [libm.so.6] 0x0000000000000001 (NEEDED) Shared library: [libgcc_s.so.1] 0x0000000000000001 (NEEDED) Shared library: [libpthread.so.0] 0x0000000000000001 (NEEDED) Shared library: [libc.so.6] 0x000000000000000f (RPATH) Library rpath: [$ORIGIN:$ORIGIN/../../../../../../bin/glnxa64:$ORIGIN/../../../../../../sys/os/glnxa64] 0x000000000000000c (INIT) 0x43e8 0x000000000000000d (FINI) 0xacf8 0x0000000000000004 (HASH) 0x1b8 0x000000006ffffef5 (GNU_HASH) 0x5e8 0x0000000000000005 (STRTAB) 0x1368 0x0000000000000006 (SYMTAB) 0x6d8 0x000000000000000a (STRSZ) 4804 (bytes) 0x000000000000000b (SYMENT) 24 (bytes) 0x0000000000000003 (PLTGOT) 0x20db48 0x0000000000000002 (PLTRELSZ) 1896 (bytes) 0x0000000000000014 (PLTREL) RELA 0x0000000000000017 (JMPREL) 0x3c80 0x0000000000000007 (RELA) 0x27c8 0x0000000000000008 (RELASZ) 5304 (bytes) 0x0000000000000009 (RELAENT) 24 (bytes) 0x000000006ffffffe (VERNEED) 0x2738 0x000000006fffffff (VERNEEDNUM) 4 0x000000006ffffff0 (VERSYM) 0x262c 0x000000006ffffff9 (RELACOUNT) 114 0x0000000000000000 (NULL) 0x0Above is R2017a library dependencies and libgstreamer-1.0.so.0 is required. But on CentOS 6.x there is no existing gstreamer-1.0 package AFAIK, build it from the source code is my only option and here are the steps.
Step 1: Check your OS version
# cat /etc/centos-release CentOS release 6.9 (Final)
If your CentOS is under version 7, then you need do following steps, otherwise these steps will not fit.
Step 2: Upgrade GCC
To compile gstreamer-1.0 requires gcc 4.5 or above but CentOS 6.x only ships gcc 4.4.7 which need be upgraded first.# gcc --version gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-18) Copyright (C) 2010 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. # yum install centos-release-scl # yum install devtoolset-3-toolchainAfter install devtoolset, you need enable it
# scl enable devtoolset-3 bashNow to check the gcc version
# gcc --version gcc (GCC) 4.9.2 20150212 (Red Hat 4.9.2-6) Copyright (C) 2014 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Step 3: Upgrade Python
Python 2.7 or above is required to compile gstreamer-1.0 but CentOS 6.x only provides Python 2.6.x and the operating system is heavily depends on it which should NOT be replaced by Python 2.7 or newer version. So make sure when you install Python 2.7, choose "make altinstall"!# yum install -y centos-release-SCL # yum install -y python27 # cd ~ # wget https://www.python.org/ftp/python/2.7.14/Python-2.7.14.tgz # tar xzf Python-2.7.14.tgz # cd Python-2.7.14 # ./configure # make altinstall # echo "alias python='/usr/local/bin/python2.7'" >> ~/.bashrc # . ~/.bashrc Optional install pip: # curl "https://bootstrap.pypa.io/get-pip.py" -o "get-pip.py" # python2.7 get-pip.py
Step 4: Install yasm 1.3.0
The performance of gstreamer-1.0 openh264 and x264 plugins can be dramatically improved by hardware acceleration which requires yasm optimization. But again the CentOS 6.x default yasm is too old which is not supported by gstreamer-1.0.# cd ~ # curl -O -L http://www.tortall.net/projects/yasm/releases/yasm-1.3.0.tar.gz # tar xzvf yasm-1.3.0.tar.gz # cd yasm-1.3.0 # ./configure # make # make install
Step 5: Prepare cerbero
Cerbero is the tool recommended by gstreamer team and it need some prerequisites to work properly. First is to create the default profile and target folder:# mkdir -p ~/.cerbero/ # vi ~/.cerbero/cerbero.cbc Paste following content to the file ---------------------------------------------------------- import os from cerbero.config import Platform, Architecture, Distro packages_prefix = 'gstreamer-sdk' packager = 'GStreamer SDK packagers <packages@gstreamer.com>' prefix = "/opt/gstreamer-sdk" git_root = "git://anongit.freedesktop.org/gstreamer-sdk" # Uncomment to allow parallel builds # allow_parallel_build = True # Uncomment this to allow cross-building for another architecture # target_arch = Architecture.X86_64 ---------------------------------------------------------- # mkdir -p /opt/gstreamer-sdkI am using /opt/gstreamer-sdk/ as the target folder. Then you need download the cerbero framework and set it up:
# cd ~ # git clone git://anongit.freedesktop.org/gstreamer/cerbero # echo "alias cerbero='~/cerbero/cerbero-uninstalled'" >> ~/.bashrc # . ~/.bashrc # cd ~/cerbero # cerbero bootstrap
Step 6: Build gstreamer-1.0
Finally we can start building gstreamer-1.0 but there are couple of catches in the recipes need be fixed first.cdparanoia: post install step will fail because the global environment FilesProvider.LIBS_CAT is empty and I don't know how to change it. So my simple solution is to hard coded it!
# vi ~/cerbero/recipes/cdparanoia.recipe
----------------------------------------------------------
#libs = self.files_list_by_category(FilesProvider.LIBS_CAT)
#for lib in libs:
for lib in self.files_libs:
f = os.path.join(self.config.prefix + '/lib', lib + '.so.0.' + self.version)
print(f)
----------------------------------------------------------
The post install steps are just to change the permissions on the generated .so files, so find the files in target folder first and work out the hard code values. Be aware of the indents of your code and print(f) is just for fun to show you the changes worked :D.# cd /opt/gstreamer-sdk/lib # ls | grep cdda libcdda_interface.a libcdda_interface.so libcdda_interface.so.0 libcdda_interface.so.0.10.2 libcdda_paranoia.a libcdda_paranoia.so libcdda_paranoia.so.0 libcdda_paranoia.so.0.10.2nettle: has the exact issue as cdparanoia but a bit more complex with two different libraries with two different versions XD.
# vi ~/cerbero/recipes/nettle/nettle.recipe
----------------------------------------------------------
#libs = self.files_list_by_category(FilesProvider.LIBS_CAT)
#for lib in libs:
for lib in self.files_libs:
f = os.path.join(self.config.prefix + '/lib', lib)
print(f)
if fnmatch(f, '*libnettle*'):
f = f + '.so.6.3'
if fnmatch(f, '*libhogweed*'):
f = f + '.so.4.3'
print(f)
----------------------------------------------------------
# cd /opt/gstreamer-sdk/lib
# ls | grep nettle
libnettle.a
libnettle.la
libnettle.so
libnettle.so.6
libnettle.so.6.3
# ls | grep hogweed
libhogweed.a
libhogweed.la
libhogweed.so
libhogweed.so.4
libhogweed.so.4.3
flac: you need specify -lrt to enable real-time functions, otherwise the linker will complain undefined reference to 'clock_gettime'.# vi ~/cerbero/recipes/flac.recipe
----------------------------------------------------------
def prepare(self):
if self.config.target_platform in [Platform.DARWIN, Platform.IOS]:
if self.config.target_arch == Architecture.X86:
self.configure_options += ' --disable-asm-optimizations'
if self.config.target_platform in [Platform.ANDROID, Platform.IOS]:
self.autoreconf = True
if self.config.target_platform == Platform.LINUX:
self.new_env['LIBS'] = '-lrt'
----------------------------------------------------------
OK, we have everything ready, pull the trigger:# cerbero package gstreamer-1.0Unfortunately the above command cannot generate the proper RPM package and since I only need solve the issue for Matlab, this is not a big problem to me, I only need the compiled run-time libraries.
Step 7: Let Matlab using the new gstreamer-1.0
The quick way is to change LD_LIBRARY_PATH# export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/opt/gstreamer-sdk/lib # ldconfig
And the permanent way is to update ld.so.conf.d
# vi /etc/ld.so.conf.d/gstreamer.conf ---------------------------------------------------------- /opt/gstreamer-sdk/lib ---------------------------------------------------------- # rebootNow Matlab R2017a is able to load video files:
>> obj=VideoReader('test.avi');
0:00:00.138478543 7933 0x7f339c007b70 ERROR libav :0:: Context scratch buffers could not be allocated due to unknown size.
0:00:00.138711800 7933 0x7f339c007b70 ERROR libav :0:: Context scratch buffers could not be allocated due to unknown size.
>>
The ERROR is caused by the leading black frames in the video file, not the gstreamer-1.0 package issue.Just uploaded the compiled folder to Google Drive https://drive.google.com/open?id=1jUL2q9LvpTcNtEbVtpaugJUPVBHoYsJ8. After you download the gstreamer-sdk.tgz file, just do following
# cd /opt/ # mv ~/Downloads/gstreamer-sdk.tgz . # tar zxf gstreamer-sdk.tgzThen add gstreamer.conf as Step 7 described. I have tested it on CentOS 6.9, CentOS 7.5, Ubuntu 18.04 lts along with Matlab R2017a, R2017b and R2018b.
WARNING about Ubuntu 18.04 lts with NVidia video card, the gstreamer libraries will cause you desktop failed to start, in this case, please boot into recovery mode and delete the file /etc/ld.so.conf.d/gstreamer.conf and run ldconfig. Use the official packages instead:
# apt-get install libgstreamer1.0-0 gstreamer1.0-plugins-base gstreamer1.0-plugins-good gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly gstreamer1.0-libav gstreamer1.0-doc gstreamer1.0-tools
SIZEOFINFINITY[∞]
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