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• MEAN stack express.js video uploader/converter

  5 janvier 2017, par MattJ

  The idea is a social site where people can upload their videos. I am planning to use multer for uploading (limiting by size and by mimetype). Then for performance and mostly storage purposes to use fluent-ffmpeg and convert it to mp4 format and store it somewhere on the server with a reference in mongodb. Since I do not want the user to wait while the whole process is done, I plan to separate it into to main parts :

  1. Uploading
  2. Converting and storing.

  Where the user uploads the file and then some separate node process ( using node-schedule) which run checks every 1 min. or so to convert all files in the directory and after that adds the references to mongodb. So what do you guys think ? What is the best approach performance-wise ?

• matroskaenc : write correct Display{Width, Height} in stereo encoding

  22 octobre 2014, par Vittorio Giovara

  matroskaenc : write correct DisplayWidth, Height in stereo encoding
  should be the raw amount of pixels (for example 3840x1080 for full HD side by
  
  side) and the DisplayWidth/Height in pixels should be the amount of pixels for
  
  one plane (1920x1080 for that full HD stream)."
  So, move the aspect ratio check in the mkv_write_stereo_mode() function
  
  and always write the embl when stereo format and/or aspect ration is set.
  
  Also add a few comments to that function.
  CC : libav-stable@libav.org
  
  Found-by : Asan Usipov <asan.usipov@gmail.com>
  

  • [DH] libavformat/matroskaenc.c

• %configure - unknown option —build

  18 janvier 2016, par Naftuli Tzvi Kay

  I’m trying to build and package FFMPEG for Fedora 23 with my own compile options and everything.

  Unfortunately, I’m trying to use the %configure directive and it isn’t working :

  Unknown option "--build=x86_64-redhat-linux-gnu".
  
  See ./configure --help for available options.

  If I try to see what the %configure clause does, here’s what I see :

    CFLAGS="${CFLAGS:--O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic}" ; export CFLAGS ; 
  
    CXXFLAGS="${CXXFLAGS:--O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic}" ; export CXXFLAGS ; 
  
    FFLAGS="${FFLAGS:--O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic -I/usr/lib64/gfortran/modules}" ; export FFLAGS ; 
  
    FCFLAGS="${FCFLAGS:--O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic -I/usr/lib64/gfortran/modules}" ; export FCFLAGS ; 
  
    LDFLAGS="${LDFLAGS:--Wl,-z,relro -specs=/usr/lib/rpm/redhat/redhat-hardened-ld}"; export LDFLAGS; 
  
    [ "1" = 1 ] && for i in $(find $(dirname ./configure) -name config.guess -o -name config.sub) ; do 
  
        [ -f /usr/lib/rpm/redhat/$(basename $i) ] && /usr/bin/rm -f $i && /usr/bin/cp -fv /usr/lib/rpm/redhat/$(basename $i) $i ; 
  
    done ; 
  
    [ "1" = 1 ] && [ x != "x-specs=/usr/lib/rpm/redhat/redhat-hardened-ld" ] && 
  
        for i in $(find . -name ltmain.sh) ; do 
  
          /usr/bin/sed -i.backup -e 's~compiler_flags=$~compiler_flags="-specs=/usr/lib/rpm/redhat/redhat-hardened-ld"~' $i 
  
        done ; 
  
    ./configure --build=x86_64-redhat-linux-gnu --host=x86_64-redhat-linux-gnu \
  
      --program-prefix= \
  
      --disable-dependency-tracking \
  
      --prefix=/usr \
  
      --exec-prefix=/usr \
  
      --bindir=/usr/bin \
  
      --sbindir=/usr/sbin \
  
      --sysconfdir=/etc \
  
      --datadir=/usr/share \
  
      --includedir=/usr/include \
  
      --libdir=/usr/lib64 \
  
      --libexecdir=/usr/libexec \
  
      --localstatedir=/var \
  
      --sharedstatedir=/var/lib \
  
      --mandir=/usr/share/man \
  
      --infodir=/usr/share/info

  Since %configure tries to set the --build parameter and FFMPEG doesn’t like that, it fails.

  However, I really want to get the CFLAGS and LDFLAGS and all of the hardening options that come provided with the distribution without baking these into my SPEC file.

  Is there a way to override the %configure task to omit the --build parameter and include everything else ?