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• Trying to determine h.264 profile & level pragmatically

  23 juin 2012, par kryptobs2000

  Ideally the solution would be in python and cross platform, but that's probably not too likely, so all I require is it work in linux, and I can use a c extension to interface w/python if necessary. I see there is a python binding for ffmpeg which I was thinking about using, however I can't figure out how to determine the profile and level as it is, with fmmpeg or anything else, much less do it pragmatically. Google is not much help on the matter either.

  I've been able to determine what features I'd be looking for if I needed to determine the profile and levels manually then I can do that, but then that leads to the question, can ffmpeg then determine if the video was encoded with that feature set ? I guess what I'm wondering to that effect is, is it perhaps not possible to fully determine the level and specific profile after encoding ? I would think you'd have to know in order to decode it, but maybe not ; that would explain why I can't find any information on it. I've been toying with this on and off for awhile, but recently decided to consider a project I'd been thinking about, but this is one of this big things holding me back.

• Connect ffmpeg to Visual Studio 2008

  29 avril 2014, par user2274492

  I try to connect ffmpeg to visual c++ like this, but when I type "./configure —toolchain=msvc" I have this error :

  c99wrap cl is unable to create an executable file.

  If c99wrap cl is a cross-compiler, use the —enable-cross-compile
  option. Only do this if you know what cross compiling means.

  C compiler test failed

  config.log :

  WARNING : pkg-config not found, library detection may fail. mktemp -u
  XXXXXX ./configure : line 728 : mktemp : command not found WARNING :
  Unknown C compiler C :\c99\c99wrap cl, unable to select optimal CFLAGS
  check_ld cc check_cc BEGIN /tmp/ffconf..ZHENYA.500.5884.c
  1 int main(void) return 0 ; END /tmp/ffconf..ZHENYA.500.5884.c C :\c99\c99wrap cl -c -o /tmp/ffconf..ZHENYA.500.5884.o
  /tmp/ffconf..ZHENYA.500.5884.c fatal error C1510 : Cannot load language
  resource clui.dll. C compiler test failed.

  What’s the problem ? Or just send me files that you got after compilation with this (I would not have asked, but I fix this two months) :

  ./configure —toolchain=msvc

  make

  make install

  ---

  log after changes :

     WARNING: pkg-config not found, library detection may fail.
  
  mktemp -u XXXXXX
  
  Uxplas
  
  check_ld cc
  
  check_cc
  
  BEGIN /tmp/ffconf.WcAVdgRZ.c
  
      1   int main(void){ return 0; }
  
  END /tmp/ffconf.WcAVdgRZ.c
  
  c99wrap cl -nologo -D_USE_MATH_DEFINES -Dinline=__inline -FIstdlib.h -Dstrtoll=_strtoi64 -c -Fo /tmp/ffconf.jQtxnkfv.o /tmp/ffconf.WcAVdgRZ.c
  
  ffconf.WcAVdgRZ.c
  
  ffconf.jQtxnkfv.o_converted.c
  
  c99wrap link -o /tmp/ffconf.sPZUPuMJ.exe /tmp/ffconf.jQtxnkfv.o
  
  link: invalid option -- o
  
  Try `link --help' for more information.
  
  C compiler test failed.

  log from second computer :

  WARNING: pkg-config not found, library detection may fail.
  
  mktemp -u XXXXXX
  
  ./configure: line 749: mktemp: command not found
  
  WARNING: Unknown C compiler c99wrap cl, unable to select optimal CFLAGS
  
  check_ld cc
  
  check_cc
  
  BEGIN /tmp/ffconf..zhenya.500.4036.c
  
  END /tmp/ffconf..zhenya.500.4036.c
  
  c99wrap cl -I/local/include -c -o /tmp/ffconf..zhenya.500.4036.o /tmp/ffconf..zhenya.500.4036.c
  
  ./configure: line 749: c99wrap: command not found
  
  C compiler test failed.

  Errors :

  1>ConsoleApplication1.obj : error LNK2028: ёё√ыър эр эхЁрчЁх°хээє■ ыхъёхьє (0A000039) "void __cdecl av_register_all(void)" (?av_register_all@@$$FYAXXZ) т ЇєэъЎшш "int __clrcall main(cli::array<class>^)" (?main@@$$HYMHP$01AP$AAVString@System@@@Z)
  
  1>ConsoleApplication1.obj : error LNK2019: ёё√ыър эр эхЁрчЁх°хээ√щ тэх°эшщ ёшьтюы "void __cdecl av_register_all(void)" (?av_register_all@@$$FYAXXZ) т ЇєэъЎшш "int __clrcall main(cli::array<class>^)" (?main@@$$HYMHP$01AP$AAVString@System@@@Z)
  
  1>c:\users\Zhenya\documents\visual studio 2012\Projects\ConsoleApplication1\Debug\ConsoleApplication1.exe : fatal error LNK1120: эхЁрчЁх°хээ√ї тэх°эшї ¤ыхьхэЄют: 2
  
  </class></class>

• Errors in building ffmpeg for android

  18 décembre 2015, par user3269550

  I have followed lots of tutorials for buildinf ffmpeg.so file like

  http://enoent.fr/blog/2014/06/20/compile-ffmpeg-for-android/

  http://www.roman10.net/how-to-build-ffmpeg-with-ndk-r9/

  and many more tutorials but at last i have stuck to this error every time i dont know how to resolve it please any one knows how to solve it then help me

  my build.sh file look like this

    NDK=C:/Users/Benzatine/Downloads/android-ndk-r10e
  
    SYSROOT=$NDK/platforms/android-19/arch-arm/
  
    TOOLCHAIN=$NDK/toolchains//arm-linux-androideabi-4.8/prebuilt/windows-x86_64
  
   function build_one
  
  {
  
  ./configure \
  
  --prefix=$PREFIX \
  
  --enable-shared \
  
  --disable-static \
  
  --disable-doc \
  
  --disable-ffmpeg \
  
  --disable-ffplay \
  
  --disable-ffprobe \
  
  --disable-ffserver \
  
  --disable-avdevice \
  
  --disable-doc \
  
  --disable-symver \
  
  --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
  
  --target-os=linux \
  
  --arch=arm \
  
  --enable-cross-compile \
  
  --sysroot=$SYSROOT \
  
  --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
  
  --extra-ldflags="$ADDI_LDFLAGS" \
  
  $ADDITIONAL_CONFIGURE_FLAG
  
  make clean
  
  make
  
  make install
  
  }
  
  CPU=arm
  
  PREFIX=$(pwd)/android/$CPU 
  
  ADDI_CFLAGS="-marm"
  
  build_one

  But when it executes make command it gives following error

   LD      libswscale/libswscale-3.so
  
      c:/users/benzatine/downloads/android-ndk-r10e/toolchains/arm-linux-androideabi-4.8/prebuilt/windows-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.8/../../../../arm-linux-androideabi/bin/ld.exe: error:     libavutil/libavutil.so:1:1: syntax error, unexpected '!', expecting $end
  
  c:/users/benzatine/downloads/android-ndk-r10e/toolchains/arm-linux-androideabi-4.8/prebuilt/windows-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.8/../../../../arm-linux-androideabi/bin/ld.exe: error: libavutil/libavutil.so: not an object or archive
  
  collect2.exe: error: ld returned 1 exit status
  
  library.mak:111: recipe for target 'libswscale/libswscale-3.so' failed
  
  make: *** [libswscale/libswscale-3.so] Error 1

  every time i try to build ffmpeg this error occure how to resolve it please someone help me