Recherche avancée

Sur d’autres sites (11394)

• How to best compress videos using PHP-FFMpeg ?

  19 décembre 2022, par Bruno Leveque

  I'm using the PHP-FFMpeg v1.1.0 library to compress videos sent from a variety of mobile devices into 480p (640x480) MP4 videos.

  


  Everything is working great, but I'm wondering how to reach an optimal compression level. It looks like I'm already using the recommended video bitrate for 480p, as well as a fairly low quality audio (64Kbps).

  


  Am I missing any best practices/options here ?

  


  My code :

  


  $videoFile = '/tmp/source.avi';
$destVideoFile = '/tmp/'.uniqid().'.mp4';
$ffmpeg = FFMpeg\FFMpeg::create();
$video = $ffmpeg->open($videoFile);
$video->filters()->resize(new FFMpeg\Coordinate\Dimension(640, 480), 'width')->synchronize();
$codec = new FFMpeg\Format\Video\X264();
$codec->setKiloBitrate(960)->setAudioKiloBitrate(64);
$video->save($codec, $destVideoFile);


  


• Capture Windows screen with ffmpeg

  4 mars 2021, par kamae

  The ffmpeg is cross-platform and very powerful software to handle video/audio or to stream it.
On Linux ffmpeg can capture X11 screen with a command below :

  



  ffmpeg -f x11grab -r 25 -s cif -i :0.0 out.mpeg


  



  But is it possible to grab Windows Desktop with ffmpeg ?

  


• ffmpeg on Intel Edison cannot find pkg-config

  4 février 2016, par Joel Gallant

  I’ve had a surprisingly difficult time finding documentation for what I’m seeing. I’m cross-compiling ffmpeg for the Intel Edison using the poky linux sdk. I’ve set up an upper level makefile to do the following :

  ffmpeg_DIR=$(shell realpath libs/ffmpeg)
  
  EdisonSDK_DIR=/opt/poky-edison/1.7.2
  
  EdisonSysroot=$(EdisonSDK_DIR)/sysroots/core2-32-poky-linux
  
  PATH:=$(EdisonSysroot)/usr/bin/:$(EdisonSysroot)/usr/bin/i586-poky-linux:$(PATH)
  
  
  
  ffmpeg-config: FORCE
  
      mkdir -p $(ffmpeg_DIR)/build; \
  
      cd $(ffmpeg_DIR); \
  
      PATH=$(PATH) ./configure \
  
          --prefix=$(ffmpeg_DIR)/build \
  
          --enable-shared \
  
          --disable-static \
  
          --disable-doc \
  
          --arch=i686 \
  
          --enable-cross-compile \
  
          --cross-prefix=i586-poky-linux- \
  
          --sysinclude=$(EdisonSysroot)/include \
  
          --pkg-config=$(EdisonSysroot)/usr/bin/pkg-config \
  
          --target-os=linux
  
  
  
  ifeq (,$(wildcard $(ffmpeg_DIR)/build))
  
  ffmpeg: ffmpeg-config FORCE
  
  else
  
  ffmpeg: FORCE
  
  endif
  
      +make -C$(ffmpeg_DIR)

  So as far as I understand it, it’s using the PATH correctly, sysroot is being inserted in cc and ld calls, and sysinclude is working.

  I’m seeing this in the output of the main makefile :

  tput: error while loading shared libraries: libtinfo.so.5: cannot open shared object file: No such file or directory

  And seeing this in the config.log

  i586-poky-linux-gcc -O2 -pipe -g -feliminate-unused-debug-types -c -o /tmp/ffconf.T3Y8Tm6G.o /tmp/ffconf.t8bOuCO2.c
  
  /opt/poky-edison/1.7.2/sysroots/core2-32-poky-linux/usr/bin/../lib/gcc/gcc/i586-poky-linux/4.9.1/cc1: error while loading shared libraries: libmpc.so.3: cannot open shared object file: No such file or directory
  
  /opt/poky-edison/1.7.2/sysroots/core2-32-poky-linux/usr/bin/../lib/gcc/i586-poky-linux/4.9.1/../../../../i586-poky-linux/bin/as: error while loading shared libraries: libopcodes-2.24.so: cannot open shared object file: No such file or directory
  
  C compiler test failed.

  So to me, that seems like a linker error. And in the config.log, I also see that pkg-config isn’t working.

  WARNING: /opt/poky-edison/1.7.2/sysroots/core2-32-poky-linux/usr/bin/pkg-config not found, library detection may fail.

  So I’m not sure what I’m doing wrong exactly. I’ve tried seeing sysroot or not, and not specifying the pkg-config.

  https://ffmpeg.org/pipermail/ffmpeg-devel/2012-June/126683.html

  This seems related but is fixed now. So not sure.