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• execute ffmpeg command in a loop

  7 février 2014, par Mohammad Torfehnezhad

  I have 3 .wav files in my folder and I want to convert them into .mp3 with ffmpeg
  I wrote this bash script that will come as follow, but when I execute it, only the first one will have been converted to mp3
  what should I do to make script keep going through out of my files

  this is the script :

  #!/bin/bash
  
  find ./ -name "*.wav" -print | while read f
  
  do
  
      name=${f:2:${#f}-6}
  
      cmd='ffmpeg -i "$name.wav" -ab 320k -ac 2 "$name.mp3"'
  
      eval $cmd<br />
  
  done

• How to catch stderr in a composite command ?

  12 février 2014, par Andrey Rikunov

  Say I have a linux command running from a java code :

  /bin/bash -c nice -n 8 ffmpeg {params of ffmpeg} & echo $! > ffmpeg.pid

  In java I want to catch stderr of ffmpeg :

  Process process = Runtime.getRuntime().exec(command);
  
  
  
  BufferedReader input = new BufferedReader(new InputStreamReader(process.getErrorStream()));
  
  while (...) {
  
      String ffmpegStdErrLine = input.readLine();
  
      ...
  
  }

  That's not about ffmpeg but how can I make sure I'm reading ffmpeg's StdErr ?

• Compiling ffmpeg for use in Android (ndk) for x86 architecture

  26 septembre 2012, par Ankur22

  I am trying to compile ffmpeg for Android but for the x86 architecture. I've successfully compiled an arm .so and it all works, and I though that by replacing arm with x86 in the relevant places within the build script would have done the trick. Unfortunately that's not the case and I get some strange things occurring.

  First I get this while it's compiling ffmpeg :

  /home/ankur/android-ndk-r8/platforms/android-8/arch-arm//usr/include/strings.h:49: warning: redundant redeclaration of 'index'

  Notice the arch-arm instead of arch-x86. Finally I get this :

  /home/ankur/android-ndk-r8/toolchains/x86-4.4.3/prebuilt/linux-x86/bin/i686-android-linux-ld: libavcodec/libavcodec.a(4xm.o): Relocations in generic ELF (EM: 40)
  
  /home/ankur/android-ndk-r8/toolchains/x86-4.4.3/prebuilt/linux-x86/bin/i686-android-linux-ld: libavcodec/libavcodec.a(4xm.o): Relocations in generic ELF (EM: 40)
  
  /home/ankur/android-ndk-r8/toolchains/x86-4.4.3/prebuilt/linux-x86/bin/i686-android-linux-ld: libavcodec/libavcodec.a(4xm.o): Relocations in generic ELF (EM: 40)
  
  libavcodec/libavcodec.a(4xm.o): could not read symbols: File in wrong format

  The build script I've created looks like this :

  #!/bin/bash
  
  
  
  NDK=~/android-ndk-r8
  
  PLATFORM=$NDK/platforms/android-8/arch-x86/
  
  PREBUILT=$NDK/toolchains/x86-4.4.3/prebuilt/linux-x86
  
  function build_one_r8
  
  {
  
  ./configure \
  
      --disable-shared \
  
      --enable-static \
  
      --enable-gpl \
  
      --enable-version3 \
  
      --enable-nonfree \
  
      --disable-doc \
  
      --disable-ffmpeg \
  
      --disable-ffplay \
  
      --disable-ffprobe \
  
      --disable-ffserver \
  
      --disable-avdevice \
  
      --disable-avfilter \
  
      --disable-postproc \
  
      --enable-small \
  
      --cross-prefix=$PREBUILT/bin/i686-android-linux- \
  
      --enable-cross-compile \
  
      --target-os=linux \
  
      --extra-cflags="-I$PLATFORM/usr/include" \
  
      --arch=x86 \
  
      --disable-symver \
  
      --disable-debug \
  
      --disable-stripping \
  
      $ADDITIONAL_CONFIGURE_FLAG
  
  sed -i 's/HAVE_LRINT 0/HAVE_LRINT 1/g' config.h
  
  sed -i 's/HAVE_LRINTF 0/HAVE_LRINTF 1/g' config.h
  
  sed -i 's/HAVE_ROUND 0/HAVE_ROUND 1/g' config.h
  
  sed -i 's/HAVE_ROUNDF 0/HAVE_ROUNDF 1/g' config.h
  
  sed -i 's/HAVE_TRUNC 0/HAVE_TRUNC 1/g' config.h
  
  sed -i 's/HAVE_TRUNCF 0/HAVE_TRUNCF 1/g' config.h
  
  make clean
  
  make  -j4 install
  
  $PREBUILT/bin/i686-android-linux-ar d libavcodec/libavcodec.a inverse.o
  
  $PREBUILT/bin/i686-android-linux-ld -rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib  -soname libffmpeg.so -shared -nostdlib  -z,noexecstack -Bsymbolic --whole-archive --no-undefined -o $PREFIX/libffmpeg.so libavcodec/libavcodec.a libavformat/libavformat.a libavutil/libavutil.a libswscale/libswscale.a -lc -lm -lz -ldl -llog  --warn-once  --dynamic-linker=/system/bin/linker $PREBUILT/lib/gcc/i686-android-linux/4.4.3/libgcc.a
  
  }
  
  function build_one_r8_2
  
  {
  
  $PREBUILT/bin/i686-android-linux-ar d libavcodec/libavcodec.a inverse.o
  
  $PREBUILT/bin/i686-android-linux-ld -rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib  -soname libffmpeg.so -shared -nostdlib  -z,noexecstack -Bsymbolic --whole-archive --no-undefined -o $PREFIX/libffmpeg.so libavcodec/libavcodec.a libavformat/libavformat.a libavutil/libavutil.a libswscale/libswscale.a -lc -lm -lz -ldl -llog  --warn-once  --dynamic-linker=/system/bin/linker $PREBUILT/lib/gcc/i686-android-linux/4.4.3/libgcc.a
  
  }
  
  #x86
  
  CPU=x86
  
  OPTIMIZE_CFLAGS="-march=$CPU "
  
  PREFIX=./android/$CPU
  
  ADDITIONAL_CONFIGURE_FLAG=
  
  build_one_r8

  I hope I'm doing something wrong rather than this not being possible.

  Thanks !