Sur d’autres sites (4798)

• How to convert all files in a specific directory using batch script

  30 mars 2017, par sks

  I have videos in a folder of .h264 format and i want to convert them to mp4. now by default i can use ffmpeg to do this :
  Here is the command :

  ffmpeg -i youtube.flv -c:v libx264 filename.mp4

  But, new h264 files are being added and I want to keep converting the videos so as to use it for my python script.

  I know i can use this to initialize the variable

  SET /A num=1

  But how do i write a batch script to take all the videos from the directory one by one even though there new videos being added ?

  I wrote this but this isn’t working :

  @echo off
  
  SET /A num=1
  
  
  
  for file in E:\Records\1\*.h264
  
  do
  
      ffmpeg -i "$file" -c:v libx264 E:\Recods\1\converted\%num%.mp4
  
      move E:\Records\1\"$file" E:\Records\1\done\
  
      set /A num=%num%+1
  
  done
  
  PAUSE

  I am making a done folder and moving the videos that have been converted there and in converted folder i am putting converted videos.. Now i just have to run a task scheduler each hour so that if there is a new entry it should convert it and move it to appropriate folder.

• Compiling FFmpeg staticly using NDK with openssl

  27 février 2017, par David Barishev

  I have been trying to compile ffmpeg into a static library in order to use it in my android application, but i couldn’t get it to work.

  Im working with FFmpeg 3.2.4, and ndk r13b, using bash on windows 10(Ubuntu 14.04).

  Here is what i did :

  • I made a stand alone toolchain for x86_64 and api 21 using :
    python make_standalone_toolchain.py --api 21 --arch x86_64 --install-dir {}

  • Made a configuration script :

    ./configure \
    
    --target-os=android                                     \
    
    --arch=x86_64                                              \
    
    --prefix=/home/david/ffmpeg_x86_64_build                          \
    
    --cross-prefix=/home/david/x86_64_toolchain/bin/x86_64-linux-android-\
    
    --sysroot=/home/david/x86_64_toolchain/sysroot                    \
    
    --enable-cross-compile                                  \
    
    --pkg-config-flags="--static"                           \
    
    --enable-ffmpeg                                         \
    
    --disable-ffplay                                        \
    
    --disable-ffprobe                                       \
    
    --disable-ffserver                                      \
    
    --disable-doc                                           \
    
    --disable-htmlpages                                     \
    
    --disable-manpages                                      \
    
    --disable-podpages                                      \
    
    --disable-txtpages                                      \
    
    --extra-cflags="-fPIC"                                  \
    
    --extra-cxxflags="-fPIC"
    
    --disable-shared --enable-static \
    
    --enable-yasm
    
    
    
    make
    
    make install

  It produced an FFmpeg executable, however when i ran it on my API 23 emulator, i got an error message :error: only position independent executables (PIE) are supported.
  Even that i used -fPic

  How can i fix it ? Also i’m not sure about my configuration, there wasn’t up to date sources on how to compile it correctly for every ABI (arm,arm64,x86,x86_64,mips,mips64) that i need for my application.
  I have seen many script, and im not too familiar with compiling native code, so i wasn’t sure what settings i need, for example like C flags and etc.

  To be precise on how i tried to configure FFmpeg :

  • I need a static library
  • I Only need the ffmpeg command line utility
  • I want to compile the library for every ABI i listed above.This configuration tried to compile for x86_64.
  • Running on android of course

  I would greatly appreciate some help on how to configure and compile this correctly.

  EDIT

  Thanks to @Alex Cohn i have been able to compile ffmpeg, however i couldn’t get it to compile using —enable-ssl however i have been faced with a problem.

  Since we are providing a system root, the compiler won’t look for files on my host machine, so we will need need to compile ssl for android from source.
  I have used this library OpenSSL-For-Android, and used the precompiled library.

  I added to the configure file these lines :

  --extra-cflags='-m32  -fPIE -I./OpenSSL-For-Android/openssl-1.0.2j/include' \
  
  --extra-ldflags='-m32 -Wl,-eh-frame-hdr -Wl,-m,elf_i386 -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now  -fPIE -pie -L./OpenSSL-For-Android/openssl-1.0.2j/lib/x86'

  I tried telling the config, that it should search for the headers of openssl here, and that it should link against this library here.

  But it fails on this test as stated on config.log :

  BEGIN /tmp/ffconf.JVeoLDmr.c
  
      1   extern int SSL_library_init();
  
      2   int main(void){ SSL_library_init(); }
  
  END /tmp/ffconf.JVeoLDmr.c
  
  /home/david/ndk/toolchains/x86-4.9/prebuilt/linux-x86_64/bin/i686-linux-android-gcc --sysroot=/home/david/ndk/platforms/android-9/arch-x86/ -isysroot /home/david/ndk/platforms/android-9/arch-x86/ -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Dstrtod=avpriv_strtod -DPIC -m32 -fPIE -I./OpenSSL-For-Android/openssl-1.0.2j/include -std=c99 -fomit-frame-pointer -fPIC -pthread -c -o /tmp/ffconf.x5yr8e11.o /tmp/ffconf.JVeoLDmr.c
  
  /home/david/ndk/toolchains/x86-4.9/prebuilt/linux-x86_64/bin/i686-linux-android-gcc -m32 -Wl,-eh-frame-hdr -Wl,-m,elf_i386 -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now -fPIE -pie -L./OpenSSL-For-Android/openssl-1.0.2j/lib/x86 --sysroot=/home/david/ndk/platforms/android-9/arch-x86/ -isysroot /home/david/ndk/platforms/android-9/arch-x86/ -Wl,--as-needed -Wl,-z,noexecstack -o /tmp/ffconf.mxzx6kFL /tmp/ffconf.x5yr8e11.o -lssl -lcrypto -lws2_32 -lgdi32 -lm -pthread
  
  /home/david/ndk/toolchains/x86-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/i686-linux-android/4.9.x/../../../../i686-linux-android/bin/ld: error: cannot find -lssl
  
  /home/david/ndk/toolchains/x86-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/i686-linux-android/4.9.x/../../../../i686-linux-android/bin/ld: error: cannot find -lws2_32
  
  /home/david/ndk/toolchains/x86-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/i686-linux-android/4.9.x/../../../../i686-linux-android/bin/ld: error: cannot find -lgdi32
  
  /tmp/ffconf.x5yr8e11.o:ffconf.JVeoLDmr.c:function main: error: undefined reference to 'SSL_library_init' 

  And it seems like it doesn’t use the precompiled shared library i passed it(since it’s compiled for Android) and doesn’t find another instance of openssl, since the sysroot is the Android AOSP one (this is what I am thinking, please correct me if I’m wrong - I’m not experienced enough in this field ) .
  How can this be fixed ? I have seen some setups with PKG-Config, but i have no clue as how to configure it correctly.

• Anomalie #3807 : [gestion sessions] : suppression de session inutilisée

  7 mai 2017, par cedric -

  Le nombre maxi de session d’un auteur est maintenant limité et vérifié à l’identification initiale et lors de la mise à jour d’une session