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• ffmpeg cannot open a simple microsoft wav file exported with Audacity

  18 février 2014, par sebpiq

  I have exported a sound file to microsoft wav using Audacity.
  I am trying to open this file with ffmpeg :

  ffmpeg -i steps-stereo-16b-44khz.wav /tmp/test.ogg

  and here's the ouput I get :

  fmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jun 12 2013 13:46:11 with Apple clang version 4.1 (tags/Apple/clang-421.11.66) (based on LLVM 3.1svn)
  
    configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libopus --enable-libtheora --enable-libschroedinger --enable-libopenjpeg --enable-libmodplug --enable-libvpx --enable-libspeex --enable-libass --enable-libbluray --enable-gnutls --enable-libfreetype --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
  
    libavutil      52. 18.100 / 52. 18.100
  
    libavcodec     54. 92.100 / 54. 92.100
  
    libavformat    54. 63.104 / 54. 63.104
  
    libavdevice    54.  3.103 / 54.  3.103
  
    libavfilter     3. 42.103 /  3. 42.103
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
  [dca @ 0x7fd30c013600] Not a valid DCA frame
  
  
  
  ... SNIP ...
  
  
  
  [dca @ 0x7fd5bc013600] Invalid bit allocation index
  
  [dca @ 0x7fd5bc013600] error decoding block
  
      Last message repeated 3 times
  
  [dca @ 0x7fd5bc013600] Didn't get subframe DSYNC
  
  [dca @ 0x7fd5bc013600] error decoding block
  
  [wav @ 0x7fd5bc013000] max_analyze_duration 5000000 reached at 5009070 microseconds
  
  [wav @ 0x7fd5bc013000] decoding for stream 0 failed
  
  [wav @ 0x7fd5bc013000] Could not find codec parameters for stream 0 (Audio: dts ([1][0][0][0] / 0x0001), 192000 Hz, 2 channels, fltp, 0 kb/s): no decodable DTS frames
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  steps-stereo-16b-44khz.wav: could not find codec parameters

  If I export the same file to .ogg or .aiff, no problem, the following works fine :

  ffmpeg -i steps-stereo-16b-44khz.aiff /tmp/test.ogg

  Any idea what could be wrong ?

  A link to my wav file so you can try to reproduce.

  NB my final goal is to slice the audio file. I know I can export file directly to .ogg with audacity. This is just a test case.

  EDIT

  Getting file info with another program like sox, works well :

  sox --info steps-stereo-16b-44khz.wav
  
  
  
  Input File     : 'steps-stereo-16b-44khz.wav'
  
  Channels       : 2
  
  Sample Rate    : 44100
  
  Precision      : 16-bit
  
  Duration       : 00:00:02.10 = 92608 samples = 157.497 CDDA sectors
  
  File Size      : 370k
  
  Bit Rate       : 1.41M
  
  Sample Encoding: 16-bit Signed Integer PCM

• Evolution #3030 : modifieur /e obsolète pour preg_replace() [et parfois désactivé pour des raisons...

  24 juillet 2013, par Gilles VINCENT

  Précision : Suhosin permet d’interdire le modifieur (ce qui n’est pas le cas de PHP par défaut)
  http://www.hardened-php.net/suhosin/configuration.html#suhosin.executor.disable_emodifier

  suhosin.executor.disable_emodifier

  Type : Boolean
  Default : Off
  The /e modifier inside preg_replace() allows code execution. Often it is the cause for remote code execution exploits. It is wise to deactivate this feature and test where in the application it is used. The developer using the /e modifier should be made aware that he should use preg_replace_callback() instead.

• Complie FFMpeg with Xcode5 preview's clang

  2 août 2013, par Yeung

  With release of IOS7 beta, I would like to try compiling ffmpeg for ios7.

  There is a lots answer like this. It use the llvm-gcc as compiler.

  However, seem like Xcode 5 would not include llvm-gcc. Then I have no choice but to use clang to compile.

  I use the following to config :

  export IOS_SDK="/Applications/Xcode5-DP4.app/Contents/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk"
  
  
  
  ./configure $CONFIG_DISABLE_FLAG $CONFIG_ENABLE_FLAG \
  
  --arch=arm \
  
  --target-os=darwin \
  
  --cc=/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang \
  
  --as='gas-preprocessor.pl /Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang' \
  
  --ar=/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ar  \
  
  --sysroot=$IOS_SDK \
  
  --cpu=cortex-a8 \
  
  --extra-cflags="-arch armv7 -mfpu=neon -mfloat-abi=softfp -ftree-vectorize -ffast-math -funsafe-math-optimizations -fsingle-precision-constant -isysroot ${IOS_SDK} -I${IOS_SDK}/usr/include" \
  
  --extra-ldflags="-arch armv7 -mfpu=neon -mfloat-abi=softfp -ftree-vectorize -ffast-math -funsafe-math-optimizations -fsingle-precision-constant -isysroot ${IOS_SDK} -L${IOS_SDK}/usr/lib" \
  
  --enable-pic 

  clang would probably not take CFLAGS other than -arch  -isysroot -I into account, but let it be.

  I seems it can complie but I encounter this. Actually, I don't understand the answer in this question. Using the external assembler ? Yes, the toolchains do have a assembler stated it is GNU version 1.38. Using --as=/Application/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/as, it even cannot pass the check as test. It fall back to use 'gas-preprocessor.pl $CC'

  Here is the config log to cannot pass :

      check_asm armv6t2 "movt r0, #0"
  
  check_as
  
  BEGIN /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
  
      1   void foo(void){ __asm__ volatile("movt r0, #0"); }
  
  END /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
  
  /Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/as --sysroot=/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DPIC -arch armv7 -no-cpp-precomp -mfpu=neon -mfloat-abi=softfp -ftree-vectorize -ffast-math -funsafe-math-optimizations -fsingle-precision-constant -isysroot /Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -I/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk/usr/include -mcpu=cortex-a8 -fPIC -c -o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.g896h4Sb.o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
  
  FATAL:/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../libexec/as/arm/as: I don't understand '-' flag!
  
  check_asm armvfp "fadds s0, s0, s0"
  
  check_as
  
  BEGIN /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
  
      1   void foo(void){ __asm__ volatile("fadds s0, s0, s0"); }
  
  END /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
  
  /Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/as --sysroot=/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DPIC -arch armv7 -no-cpp-precomp -mfpu=neon -mfloat-abi=softfp -ftree-vectorize -ffast-math -funsafe-math-optimizations -fsingle-precision-constant -isysroot /Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -I/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk/usr/include -mcpu=cortex-a8 -fPIC -c -o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.g896h4Sb.o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
  
  FATAL:/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../libexec/as/arm/as: I don't understand '-' flag!
  
  check_asm neon "vadd.i16 q0, q0, q0"
  
  check_as
  
  BEGIN /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
  
      1   void foo(void){ __asm__ volatile("vadd.i16 q0, q0, q0"); }
  
  END /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
  
  /Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/as --sysroot=/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DPIC -arch armv7 -no-cpp-precomp -mfpu=neon -mfloat-abi=softfp -ftree-vectorize -ffast-math -funsafe-math-optimizations -fsingle-precision-constant -isysroot /Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -I/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk/usr/include -mcpu=cortex-a8 -fPIC -c -o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.g896h4Sb.o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
  
  FATAL:/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../libexec/as/arm/as: I don't understand '-' flag!
  
  check_asm vfpv3 "vmov.f32 s0, #1.0"
  
  check_as
  
  BEGIN /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
  
      1   void foo(void){ __asm__ volatile("vmov.f32 s0, #1.0"); }
  
  END /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
  
  /Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/as --sysroot=/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DPIC -arch armv7 -no-cpp-precomp -mfpu=neon -mfloat-abi=softfp -ftree-vectorize -ffast-math -funsafe-math-optimizations -fsingle-precision-constant -isysroot /Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -I/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk/usr/include -mcpu=cortex-a8 -fPIC -c -o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.g896h4Sb.o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
  
  FATAL:/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../libexec/as/arm/as: I don't understand '-' flag!
  
  check_asm asm_mod_y "vmul.i32 d0, d0, %y0" :: "x"(0)
  
  check_as
  
  BEGIN /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
  
      1   void foo(void){ __asm__ volatile("vmul.i32 d0, d0, %y0" :: "x"(0)); }
  
  END /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
  
  /Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/as --sysroot=/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -DPIC -arch armv7 -no-cpp-precomp -mfpu=neon -mfloat-abi=softfp -ftree-vectorize -ffast-math -funsafe-math-optimizations -fsingle-precision-constant -isysroot /Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk -I/Applications/Xcode5-DP4.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk/usr/include -mcpu=cortex-a8 -fPIC -c -o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.g896h4Sb.o /var/folders/gx/_k242p6s5cb0hss_pvj4s7vh0000gn/T//ffconf.4wwSSmLm.c
  
  FATAL:/Applications/Xcode5-DP4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../libexec/as/arm/as: I don't understand '-' flag!
  
  check_asm gnu_as ".macro m n
  
  \n:.int 0
  
  .endm
  
  m x"

  Yep, with config --disable-asm would complie but it probably not a option.