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• Failing to build ffmpeg for Android

  3 octobre 2018, par Hamed Momeni

  I’m trying build the ffmpeg sources for Android using two different approaches :

  1. https://yesimroy.gitbooks.io/android-note/content/compile_ffmpeg_for_android.html
  2. https://github.com/Khang-NT/ffmpeg-binary-android

  The problem here is that I am facing a somewhat similar problem in both the approaches so I guess the problem lies not with those scripts but there is some thing off in my environment. Here are the outputs of both build scripts :

  For approach #1 :

  /home/hamed/dev/android-tools/android-sdk-linux/ndk-bundle/toolchains/x86-4.9/prebuilt/linux-x86_64/bin/i686-linux-android-gcc is unable to create an executable file.
  
  C compiler test failed.
  
  
  
  If you think configure made a mistake, make sure you are using the latest
  
  version from Git.  If the latest version fails, report the problem to the
  
  ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
  
  Include the log file "conflog.txt" produced by configure as this will help
  
  solve the problem.
  
  Makefile:2: ffbuild/config.mak: No such file or directory
  
  Makefile:40: /tools/Makefile: No such file or directory
  
  Makefile:41: /ffbuild/common.mak: No such file or directory
  
  Makefile:90: /libavutil/Makefile: No such file or directory
  
  Makefile:90: /ffbuild/library.mak: No such file or directory
  
  Makefile:92: /fftools/Makefile: No such file or directory
  
  Makefile:93: /doc/Makefile: No such file or directory
  
  Makefile:94: /doc/examples/Makefile: No such file or directory
  
  Makefile:159: /tests/Makefile: No such file or directory
  
  make: *** No rule to make target '/tests/Makefile'.  Stop.
  
  Makefile:2: ffbuild/config.mak: No such file or directory
  
  Makefile:40: /tools/Makefile: No such file or directory
  
  Makefile:41: /ffbuild/common.mak: No such file or directory
  
  Makefile:90: /libavutil/Makefile: No such file or directory
  
  Makefile:90: /ffbuild/library.mak: No such file or directory
  
  Makefile:92: /fftools/Makefile: No such file or directory
  
  Makefile:93: /doc/Makefile: No such file or directory
  
  Makefile:94: /doc/examples/Makefile: No such file or directory
  
  Makefile:159: /tests/Makefile: No such file or directory
  
  make: *** No rule to make target '/tests/Makefile'.  Stop.
  
  Makefile:2: ffbuild/config.mak: No such file or directory
  
  Makefile:40: /tools/Makefile: No such file or directory
  
  Makefile:41: /ffbuild/common.mak: No such file or directory
  
  Makefile:90: /libavutil/Makefile: No such file or directory
  
  Makefile:90: /ffbuild/library.mak: No such file or directory
  
  Makefile:92: /fftools/Makefile: No such file or directory
  
  Makefile:93: /doc/Makefile: No such file or directory
  
  Makefile:94: /doc/examples/Makefile: No such file or directory
  
  Makefile:159: /tests/Makefile: No such file or directory
  
  make: *** No rule to make target '/tests/Makefile'.  Stop.
  
  Android X86 builds finished

  And for approach #2 :

  checking how to print strings... printf
  
  checking for style of include used by make... GNU
  
  checking for arm-linux-androideabi-gcc... /home/hamed/dev/android-tools/android-ndk-r18/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc
  
  checking whether the C compiler works... no
  
  configure: error: in `/home/hamed/dev/projects/ffmpeg/ffmpeg-binary-android/build_scripts/opus-1.1.5':
  
  configure: error: C compiler cannot create executables

  I even tried redownloading the NDK fearing that the gcc compiler was corrupt but still the same error line appears.

  And this is the config.log file from the OPUS module of the second approach :

  This file contains any messages produced by compilers while
  
  running configure, to aid debugging if configure makes a mistake.
  
  
  
  It was created by opus configure 1.1.5, which was
  
  generated by GNU Autoconf 2.69.  Invocation command line was
  
  
  
    $ ./configure -v --prefix=/home/hamed/dev/projects/ffmpeg/ffmpeg-binary-android/build_scripts/build_dir --host=arm-linux-androideabi --enable-static --disable-shared --disable-doc --disable-extra-programs
  
  
  
  ## --------- ##
  
  ## Platform. ##
  
  ## --------- ##
  
  
  
  hostname = putech-laptop
  
  uname -m = x86_64
  
  uname -r = 4.15.0-36-generic
  
  uname -s = Linux
  
  uname -v = #39-Ubuntu SMP Mon Sep 24 16:19:09 UTC 2018
  
  
  
  /usr/bin/uname -p = unknown
  
  /bin/uname -X     = unknown
  
  
  
  /bin/arch              = unknown
  
  /usr/bin/arch -k       = unknown
  
  /usr/convex/getsysinfo = unknown
  
  /usr/bin/hostinfo      = unknown
  
  /bin/machine           = unknown
  
  /usr/bin/oslevel       = unknown
  
  /bin/universe          = unknown
  
  
  
  PATH: /home/hamed/.local/bin
  
  PATH: /home/hamed/.local/bin
  
  PATH: /usr/local/sbin
  
  PATH: /usr/local/bin
  
  PATH: /usr/sbin
  
  PATH: /usr/bin
  
  PATH: /sbin
  
  PATH: /bin
  
  PATH: /usr/games
  
  PATH: /usr/local/games
  
  PATH: /snap/bin
  
  PATH: /home/hamed/dev/go/bin
  
  PATH: /home/hamed/dev/android-tools/android-sdk-linux/platform-tools/
  
  PATH: /home/hamed/dev/go/bin
  
  PATH: /home/hamed/dev/android-tools/android-sdk-linux/platform-tools/
  
  PATH: /home/hamed/dev/projects/ffmpeg/ffmpeg-binary-android/build_scripts/build_dir/bin/
  
  
  
  
  
  ## ----------- ##
  
  ## Core tests. ##
  
  ## ----------- ##
  
  
  
  configure:2354: checking whether make supports nested variables
  
  configure:2371: result: yes
  
  configure:2437: checking for a BSD-compatible install
  
  configure:2505: result: /usr/bin/install -c
  
  configure:2516: checking whether build environment is sane
  
  configure:2571: result: yes
  
  configure:2630: checking for arm-linux-androideabi-strip
  
  configure:2657: result: /home/hamed/dev/android-tools/android-ndk-r18/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-strip
  
  configure:2722: checking for a thread-safe mkdir -p
  
  configure:2761: result: /bin/mkdir -p
  
  configure:2768: checking for gawk
  
  configure:2798: result: no
  
  configure:2768: checking for mawk
  
  configure:2784: found /usr/bin/mawk
  
  configure:2795: result: mawk
  
  configure:2806: checking whether make sets $(MAKE)
  
  configure:2828: result: yes
  
  configure:2953: checking whether to enable maintainer-specific portions of Makefiles
  
  configure:2962: result: yes
  
  configure:2980: checking build system type
  
  configure:2994: result: x86_64-unknown-linux-gnu
  
  configure:3014: checking host system type
  
  configure:3027: result: arm-unknown-linux-androideabi
  
  configure:3099: checking how to print strings
  
  configure:3126: result: printf
  
  configure:3159: checking for style of include used by make
  
  configure:3187: result: GNU
  
  configure:3218: checking for arm-linux-androideabi-gcc
  
  configure:3245: result: /home/hamed/dev/android-tools/android-ndk-r18/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc
  
  configure:3514: checking for C compiler version
  
  configure:3523: /home/hamed/dev/android-tools/android-ndk-r18/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc --version >&5
  
  Android (4751641 based on r328903) clang version 7.0.2 (https://android.googlesource.com/toolchain/clang 003100370607242ddd5815e4a043907ea9004281) (https://android.googlesource.com/toolchain/llvm 1d739ffb0366421d383e04ff80ec2ee591315116) (based on LLVM 7.0.2svn)
  
  Target: arm--linux-android
  
  Thread model: posix
  
  InstalledDir: /home/hamed/dev/android-tools/android-ndk-r18/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../../../../llvm/prebuilt/linux-x86_64/bin
  
  configure:3534: $? = 0
  
  configure:3523: /home/hamed/dev/android-tools/android-ndk-r18/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc -v >&5
  
  Android (4751641 based on r328903) clang version 7.0.2 (https://android.googlesource.com/toolchain/clang 003100370607242ddd5815e4a043907ea9004281) (https://android.googlesource.com/toolchain/llvm 1d739ffb0366421d383e04ff80ec2ee591315116) (based on LLVM 7.0.2svn)
  
  Target: arm--linux-android
  
  Thread model: posix
  
  InstalledDir: /home/hamed/dev/android-tools/android-ndk-r18/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../../../../llvm/prebuilt/linux-x86_64/bin
  
  configure:3534: $? = 0
  
  configure:3523: /home/hamed/dev/android-tools/android-ndk-r18/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc -V >&5
  
  clang: error: argument to '-V' is missing (expected 1 value)
  
  clang: error: no input files
  
  configure:3534: $? = 1
  
  configure:3523: /home/hamed/dev/android-tools/android-ndk-r18/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc -qversion >&5
  
  clang: error: unknown argument '-qversion', did you mean '--version'?
  
  clang: error: no input files
  
  configure:3534: $? = 1
  
  configure:3554: checking whether the C compiler works
  
  configure:3576: /home/hamed/dev/android-tools/android-ndk-r18/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc -mfloat-abi=softfp -marm -march=armv7-a -Os -O3   -I/home/hamed/dev/projects/ffmpeg/ffmpeg-binary-android/build_scripts/build_dir/include --sysroot=/home/hamed/dev/android-tools/android-ndk-r18/platforms/android-16/arch-arm/ -fPIE  --sysroot=/home/hamed/dev/android-tools/android-ndk-r18/platforms/android-16/arch-arm/  -L/home/hamed/dev/projects/ffmpeg/ffmpeg-binary-android/build_scripts/build_dir/lib -fPIE -pie  conftest.c  >&5
  
  /usr/bin/ld: unrecognised emulation mode: armelf_linux_eabi
  
  Supported emulations: elf_x86_64 elf32_x86_64 elf_i386 elf_iamcu i386linux elf_l1om elf_k1om i386pep i386pe
  
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  
  configure:3580: $? = 1
  
  configure:3618: result: no
  
  configure: failed program was:
  
  | /* confdefs.h */
  
  | #define PACKAGE_NAME "opus"
  
  | #define PACKAGE_TARNAME "opus"
  
  | #define PACKAGE_VERSION "1.1.5"
  
  | #define PACKAGE_STRING "opus 1.1.5"
  
  | #define PACKAGE_BUGREPORT "opus@xiph.org"
  
  | #define PACKAGE_URL ""
  
  | /* end confdefs.h.  */
  
  | 
  
  | int
  
  | main ()
  
  | {
  
  | 
  
  |   ;
  
  |   return 0;
  
  | }
  
  configure:3623: error: in `/home/hamed/dev/projects/ffmpeg/ffmpeg-binary-android/build_scripts/opus-1.1.5':
  
  configure:3625: error: C compiler cannot create executables
  
  See `config.log' for more details
  
  
  
  ## ---------------- ##
  
  ## Cache variables. ##
  
  ## ---------------- ##
  
  
  
  ac_cv_build=x86_64-unknown-linux-gnu
  
  ac_cv_env_ARM_NEON_INTR_CFLAGS_set=
  
  ac_cv_env_ARM_NEON_INTR_CFLAGS_value=
  
  ac_cv_env_CCASFLAGS_set=
  
  ac_cv_env_CCASFLAGS_value=
  
  ac_cv_env_CCAS_set=
  
  ac_cv_env_CCAS_value=
  
  ac_cv_env_CC_set=set
  
  ac_cv_env_CC_value=/home/hamed/dev/android-tools/android-ndk-r18/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc
  
  ac_cv_env_CFLAGS_set=set
  
  ac_cv_env_CFLAGS_value='-mfloat-abi=softfp -marm -march=armv7-a -Os -O3   -I/home/hamed/dev/projects/ffmpeg/ffmpeg-binary-android/build_scripts/build_dir/include --sysroot=/home/hamed/dev/android-tools/android-ndk-r18/platforms/android-16/arch-arm/ -fPIE '
  
  ac_cv_env_CPPFLAGS_set=set
  
  ac_cv_env_CPPFLAGS_value='--sysroot=/home/hamed/dev/android-tools/android-ndk-r18/platforms/android-16/arch-arm/ '
  
  ac_cv_env_CPP_set=set
  
  ac_cv_env_CPP_value=/home/hamed/dev/android-tools/android-ndk-r18/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-cpp
  
  ac_cv_env_LDFLAGS_set=set
  
  ac_cv_env_LDFLAGS_value='-L/home/hamed/dev/projects/ffmpeg/ffmpeg-binary-android/build_scripts/build_dir/lib -fPIE -pie '
  
  ac_cv_env_LIBS_set=
  
  ac_cv_env_LIBS_value=
  
  ac_cv_env_LT_SYS_LIBRARY_PATH_set=
  
  ac_cv_env_LT_SYS_LIBRARY_PATH_value=
  
  ac_cv_env_X86_AVX_CFLAGS_set=
  
  ac_cv_env_X86_AVX_CFLAGS_value=
  
  ac_cv_env_X86_SSE2_CFLAGS_set=
  
  ac_cv_env_X86_SSE2_CFLAGS_value=
  
  ac_cv_env_X86_SSE4_1_CFLAGS_set=
  
  ac_cv_env_X86_SSE4_1_CFLAGS_value=
  
  ac_cv_env_X86_SSE_CFLAGS_set=
  
  ac_cv_env_X86_SSE_CFLAGS_value=
  
  ac_cv_env_build_alias_set=
  
  ac_cv_env_build_alias_value=
  
  ac_cv_env_host_alias_set=set
  
  ac_cv_env_host_alias_value=arm-linux-androideabi
  
  ac_cv_env_target_alias_set=
  
  ac_cv_env_target_alias_value=
  
  ac_cv_host=arm-unknown-linux-androideabi
  
  ac_cv_path_install='/usr/bin/install -c'
  
  ac_cv_path_mkdir=/bin/mkdir
  
  ac_cv_prog_AWK=mawk
  
  ac_cv_prog_CC=/home/hamed/dev/android-tools/android-ndk-r18/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc
  
  ac_cv_prog_STRIP=/home/hamed/dev/android-tools/android-ndk-r18/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-strip
  
  ac_cv_prog_make_make_set=yes
  
  am_cv_make_support_nested_variables=yes
  
  
  
  ## ----------------- ##
  
  ## Output variables. ##
  
  ## ----------------- ##
  
  
  
  ACLOCAL='${SHELL} /home/hamed/dev/projects/ffmpeg/ffmpeg-binary-android/build_scripts/opus-1.1.5/missing aclocal-1.15'
  
  AMDEPBACKSLASH='\'
  
  AMDEP_FALSE='#'
  
  AMDEP_TRUE=''
  
  AMTAR='$${TAR-tar}'
  
  AM_BACKSLASH='\'
  
  AM_DEFAULT_V='$(AM_DEFAULT_VERBOSITY)'
  
  AM_DEFAULT_VERBOSITY='0'
  
  AM_V='$(V)'
  
  AR='/home/hamed/dev/android-tools/android-ndk-r18/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-ar'
  
  ARM2GNU_PARAMS=''
  
  ARM_NEON_INTR_CFLAGS=''
  
  AUTOCONF='${SHELL} /home/hamed/dev/projects/ffmpeg/ffmpeg-binary-android/build_scripts/opus-1.1.5/missing autoconf'
  
  AUTOHEADER='${SHELL} /home/hamed/dev/projects/ffmpeg/ffmpeg-binary-android/build_scripts/opus-1.1.5/missing autoheader'
  
  AUTOMAKE='${SHELL} /home/hamed/dev/projects/ffmpeg/ffmpeg-binary-android/build_scripts/opus-1.1.5/missing automake-1.15'
  
  AWK='mawk'
  
  CC='/home/hamed/dev/android-tools/android-ndk-r18/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc'
  
  CCAS=''
  
  CCASDEPMODE=''
  
  CCASFLAGS=''
  
  CCDEPMODE=''
  
  CFLAGS='-mfloat-abi=softfp -marm -march=armv7-a -Os -O3   -I/home/hamed/dev/projects/ffmpeg/ffmpeg-binary-android/build_scripts/build_dir/include --sysroot=/home/hamed/dev/android-tools/android-ndk-r18/platforms/android-16/arch-arm/ -fPIE '
  
  CPP='/home/hamed/dev/android-tools/android-ndk-r18/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-cpp'
  
  CPPFLAGS='--sysroot=/home/hamed/dev/android-tools/android-ndk-r18/platforms/android-16/arch-arm/ '
  
  CPU_ARM_FALSE=''
  
  CPU_ARM_TRUE=''
  
  CUSTOM_MODES_FALSE=''
  
  CUSTOM_MODES_TRUE=''
  
  CYGPATH_W='echo'
  
  DEFS=''
  
  DEPDIR='.deps'
  
  DISABLE_FLOAT_API_FALSE=''
  
  DISABLE_FLOAT_API_TRUE=''
  
  DLLTOOL=''
  
  DSYMUTIL=''
  
  DUMPBIN=''
  
  ECHO_C=''
  
  ECHO_N='-n'
  
  ECHO_T=''
  
  EGREP=''
  
  EXEEXT=''
  
  EXTRA_PROGRAMS_FALSE=''
  
  EXTRA_PROGRAMS_TRUE=''
  
  FGREP=''
  
  FIXED_POINT_FALSE=''
  
  FIXED_POINT_TRUE=''
  
  GREP=''
  
  HAVE_ARM_NE10=''
  
  HAVE_ARM_NE10_FALSE=''
  
  HAVE_ARM_NE10_TRUE=''
  
  HAVE_ARM_NEON_INTR_FALSE=''
  
  HAVE_ARM_NEON_INTR_TRUE=''
  
  HAVE_AVX_FALSE=''
  
  HAVE_AVX_TRUE=''
  
  HAVE_DOXYGEN=''
  
  HAVE_DOXYGEN_FALSE=''
  
  HAVE_DOXYGEN_TRUE=''
  
  HAVE_PERL=''
  
  HAVE_SSE2_FALSE=''
  
  HAVE_SSE2_TRUE=''
  
  HAVE_SSE4_1_FALSE=''
  
  HAVE_SSE4_1_TRUE=''
  
  HAVE_SSE_FALSE=''
  
  HAVE_SSE_TRUE=''
  
  INSTALL_DATA='${INSTALL} -m 644'
  
  INSTALL_PROGRAM='${INSTALL}'
  
  INSTALL_SCRIPT='${INSTALL}'
  
  INSTALL_STRIP_PROGRAM='$(install_sh) -c -s'
  
  LD='/home/hamed/dev/android-tools/android-ndk-r18/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-ld'
  
  LDFLAGS='-L/home/hamed/dev/projects/ffmpeg/ffmpeg-binary-android/build_scripts/build_dir/lib -fPIE -pie '
  
  LIBM=''
  
  LIBOBJS=''
  
  LIBS=''
  
  LIBTOOL=''
  
  LIPO=''
  
  LN_S=''
  
  LTLIBOBJS=''
  
  LT_SYS_LIBRARY_PATH=''
  
  MAINT=''
  
  MAINTAINER_MODE_FALSE='#'
  
  MAINTAINER_MODE_TRUE=''
  
  MAKEINFO='${SHELL} /home/hamed/dev/projects/ffmpeg/ffmpeg-binary-android/build_scripts/opus-1.1.5/missing makeinfo'
  
  MANIFEST_TOOL=''
  
  MKDIR_P='/bin/mkdir -p'
  
  NE10_CFLAGS=''
  
  NE10_LIBS=''
  
  NM='/home/hamed/dev/android-tools/android-ndk-r18/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-nm'
  
  NMEDIT=''
  
  OBJDUMP=''
  
  OBJEXT=''
  
  OPUS_ARM_EXTERNAL_ASM_FALSE=''
  
  OPUS_ARM_EXTERNAL_ASM_TRUE=''
  
  OPUS_ARM_INLINE_ASM_FALSE=''
  
  OPUS_ARM_INLINE_ASM_TRUE=''
  
  OPUS_ARM_MAY_HAVE_EDSP=''
  
  OPUS_ARM_MAY_HAVE_MEDIA=''
  
  OPUS_ARM_MAY_HAVE_NEON=''
  
  OPUS_ARM_NEON_INTR_CFLAGS=''
  
  OPUS_HAVE_RTCD=''
  
  OPUS_LT_AGE='5'
  
  OPUS_LT_CURRENT='5'
  
  OPUS_LT_REVISION='5'
  
  OPUS_X86_AVX_CFLAGS=''
  
  OPUS_X86_SSE2_CFLAGS=''
  
  OPUS_X86_SSE4_1_CFLAGS=''
  
  OPUS_X86_SSE_CFLAGS=''
  
  OTOOL64=''
  
  OTOOL=''
  
  PACKAGE='opus'
  
  PACKAGE_BUGREPORT='opus@xiph.org'
  
  PACKAGE_NAME='opus'
  
  PACKAGE_STRING='opus 1.1.5'
  
  PACKAGE_TARNAME='opus'
  
  PACKAGE_URL=''
  
  PACKAGE_VERSION='1.1.5'
  
  PATH_SEPARATOR=':'
  
  PC_BUILD=''
  
  RANLIB='/home/hamed/dev/android-tools/android-ndk-r18/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-ranlib'
  
  SED=''
  
  SET_MAKE=''
  
  SHELL='/bin/bash'
  
  STRIP='/home/hamed/dev/android-tools/android-ndk-r18/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-strip'
  
  VERSION='1.1.5'
  
  X86_AVX_CFLAGS=''
  
  X86_SSE2_CFLAGS=''
  
  X86_SSE4_1_CFLAGS=''
  
  X86_SSE_CFLAGS=''
  
  ac_ct_AR=''
  
  ac_ct_CC=''
  
  ac_ct_DUMPBIN=''
  
  am__EXEEXT_FALSE=''
  
  am__EXEEXT_TRUE=''
  
  am__fastdepCCAS_FALSE=''
  
  am__fastdepCCAS_TRUE=''
  
  am__fastdepCC_FALSE=''
  
  am__fastdepCC_TRUE=''
  
  am__include='include'
  
  am__isrc=''
  
  am__leading_dot='.'
  
  am__nodep='_no'
  
  am__quote=''
  
  am__tar='$${TAR-tar} chof - "$$tardir"'
  
  am__untar='$${TAR-tar} xf -'
  
  bindir='${exec_prefix}/bin'
  
  build='x86_64-unknown-linux-gnu'
  
  build_alias=''
  
  build_cpu='x86_64'
  
  build_os='linux-gnu'
  
  build_vendor='unknown'
  
  datadir='${datarootdir}'
  
  datarootdir='${prefix}/share'
  
  docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
  
  dvidir='${docdir}'
  
  exec_prefix='NONE'
  
  host='arm-unknown-linux-androideabi'
  
  host_alias='arm-linux-androideabi'
  
  host_cpu='arm'
  
  host_os='linux-androideabi'
  
  host_vendor='unknown'
  
  htmldir='${docdir}'
  
  includedir='${prefix}/include'
  
  infodir='${datarootdir}/info'
  
  install_sh='${SHELL} /home/hamed/dev/projects/ffmpeg/ffmpeg-binary-android/build_scripts/opus-1.1.5/install-sh'
  
  libdir='${exec_prefix}/lib'
  
  libexecdir='${exec_prefix}/libexec'
  
  localedir='${datarootdir}/locale'
  
  localstatedir='${prefix}/var'
  
  mandir='${datarootdir}/man'
  
  mkdir_p='$(MKDIR_P)'
  
  oldincludedir='/usr/include'
  
  pdfdir='${docdir}'
  
  prefix='/home/hamed/dev/projects/ffmpeg/ffmpeg-binary-android/build_scripts/build_dir'
  
  program_transform_name='s,x,x,'
  
  psdir='${docdir}'
  
  sbindir='${exec_prefix}/sbin'
  
  sharedstatedir='${prefix}/com'
  
  sysconfdir='${prefix}/etc'
  
  target_alias=''
  
  
  
  ## ----------- ##
  
  ## confdefs.h. ##
  
  ## ----------- ##
  
  
  
  /* confdefs.h */
  
  #define PACKAGE_NAME "opus"
  
  #define PACKAGE_TARNAME "opus"
  
  #define PACKAGE_VERSION "1.1.5"
  
  #define PACKAGE_STRING "opus 1.1.5"
  
  #define PACKAGE_BUGREPORT "opus@xiph.org"
  
  #define PACKAGE_URL ""
  
  
  
  configure: exit 77

• Space Adventure CD-ROM

  1er octobre 2011, par Multimedia Mike — Game Hacking

  I acquired a CD-ROM entitled Space Adventure by Knowledge Adventure (I like these people ; they make decent, entertaining educational games). The physical media displays a copyright date of 1993, very early in the multimedia era.

  
  
  

  This 1993 CD-ROM makes proud use of multimedia files. What kind ? There’s a movies/ directory with 17 .mov files. It would be way too simple if these were QuickTime files, though. These represent a custom format, and video-only since a separate sounds/ directory contains .snd files with filenames corresponding to the .mov files. The .snd files are actually Creative Voice (a.k.a. VOC) files. As for this MOV format, wiki page and samples.

  
  
  

  I was also surprised to find the binary ultrasnd.exe file among the drivers on the disc. The Gravis UltraSound was released in 1992. The sound setup utility does not have an option for the GUS, however. No matter since DOSBox has great SB/Pro/16 emulation.

  I’m also a bit puzzled about why the DOSBox screenshots are 720 x 480 (posted here are various cropping and resizings).

• More Cinepak Madness

  20 octobre 2011, par Multimedia Mike — Codec Technology

  Fellow digital archaeologist Clone2727 found a possible fifth variant of the Cinepak video codec. He asked me if I cared to investigate the sample. I assured him I wouldn’t be able to die a happy multimedia nerd unless I have cataloged all possible Cinepak variants known to exist in the wild. I’m sure there are chemistry nerds out there who are ecstatic when another element is added to the periodic table. Well, that’s me, except with weird multimedia formats.

  Background
  Cinepak is a video codec that saw widespread use in the early days of digital multimedia. To date, we have cataloged 4 variants of Cinepak in the wild. This distinction is useful when trying to write and maintain an all-in-one decoder. The variants are :

  1. The standard type : Most Cinepak data falls into this category. It decodes to a modified/simplified YUV 4:2:0 planar colorspace and is often seen in AVI and QuickTime/MOV files.
  2. 8-bit greyscale : Essentially the same as the standard type but with only a Y plane. This has only been identified in AVI files and is distinguished by the file header’s video bits/pixel field being set to 8 instead of 24.
  3. 8-bit paletted : Again, this is identified by the video header specifying 8 bits/pixel for a Cinepak stream. There is essentially only a Y plane in the data, however, each 8-bit value is a palette index. The palette is transported along with the video header. To date, only one known sample of this format has even been spotted in the wild, and it’s classified as NSFW. It is also a QuickTime/MOV file.
  4. Sega/FILM CPK data : Sega Saturn games often used CPK files which stored a variant of Cinepak that, while very close the standard Cinepak, couldn’t be decoded with standard decoder components.

  So, a flexible Cinepak decoder has to identify if the file’s video header specified 8 bits/pixel. How does it distinguish between greyscale and paletted ? If a file is paletted, a custom palette should have been included with the video header. Thus, if video bits/pixel is 8 and a palette is present, use paletted ; else, use greyscale. Beyond that, the Cinepak decoder has a heuristic to determine how to handle the standard type of data, which might deviate slightly if it comes from a Sega CPK file.

  The Fifth Variant ?
  Now, regarding this fifth variant– the reason this issue came up is because of that aforementioned heuristic. Basically, a Cinepak chunk is supposed to store the length of the entire chunk in its header. The data from a Sega CPK file plays fast and loose with this chunk size and the discrepancy makes it easy to determine if the data requires special handling. However, a handful of files discovered on a Macintosh game called “The Journeyman Project : Pegasus Prime” have chunk lengths which are sometimes in disagreement with the lengths reported in the containing QuickTime file’s stsz atom. This trips the heuristic and tries to apply the CPK rules against Cinepak data which, aside from the weird chunk length, is perfectly compliant.

  Here are the first few chunk sizes, as reported by the file header (stsz atom) and the chunk :

  size from stsz = 7880 (0x1EC8) ; from header = 3940 (0xF64)
  size from stsz = 3940 (0xF64) ; from header = 3940 (0xF64)
  size from stsz = 15792 (0x3DB0) ; from header = 3948 (0xF6C)
  size from stsz = 11844 (0x2E44) ; from header = 3948 (0xF6C)
  

  Hey, there’s a pattern here. If they don’t match, then the stsz size is an even multiple of the chunk size (2x, 3x, or 4x in my observation). I suppose I could revise the heuristic to state that if the stsz size is 2x, 3x, 4x, or equal to the chunk header, qualify it as compliant Cinepak data.

  Of course it feels impure, but software engineering is rarely about programmatic purity. A decade of special cases in the FFmpeg / Libav codebases are a testament to that.

  What’s A Variant ?
  Suddenly, I find myself contemplating what truly constitutes a variant. Maybe this was just a broken encoder program making these files ? And for that, I assign it the designation of distinct variation, like some sort of special, unique showflake ?

  Then again, I documented Magic Carpet FLIC as being a distinct variant of the broader FLIC format (which has an enormous number of variants as well).