Recherche avancée

Sur d’autres sites (14126)

• android ffmpeg : file protocol not found

  18 octobre 2012, par Abdul Mateen

  I am trying to run ffmpeg commands through android programmatically and have build ffmpeg for android. Some commands working properly, but the commands having file path like "/mnt/sdcard/video.mp4" is giving error(Exception) that : file protocol not found.

  How to run such commands ?

  Thanking you !

• Accessing webcam mic from command line version of FFMPEG for android

  19 mai 2014, par user1545779

  I am currently testing audio and video streaming from a webcam using a command line version of FFMPEG on an android box. I am having a problem accessing the webcam mic

  Using Ubuntu as a reference, the correct command to determine the recording devices available is arecord -L . Unfortunately arecord -L does not work on the Android box

  The current command option alsa for accessing the webcam mic is ffmpeg -f alsa -alsa_device_name.. and the previous option of oss does not work either, ie ffmpeg -f -oss.. does not work either.

  The listed audio devices shown in /dev/snd shows the mic portion of the webcam as pcmC3D0c and controlC3. The reason I know this is because if I unplug the webcam these values vanish from the directory listing.

  Has anyone tried successfully to access the mic portion of a webcam using ffmpeg on an android box ?
  How do you formulate the correct format of the command to access the webcam mic.

  Please note that I am able to access the audio and video on my Ubuntu PC using ffmpeg hence i know that both devices work

• Build ffmpeg on Android. Using NEON (Tegra3) and Cygwin

  22 août 2012, par intox2001

  I have some issues building ffmpeg for Android using NEON instructions (for Tegra3).
  I am able to create the libffmpeg.so WITHOUT the optmization : -mfpu=neon

  I am using lastest ffmpeg 0.11.1 with Cygwin on Windows.

  Please find below the build.sh file i'm using (found on the web and tweaked)

  #!/bin/bash
  
  export TMPDIR=C:/Arnaud/Private/Android/temp
  
  NDK=C:/Arnaud/Private/Android/android-ndk-r8b
  
  ###Path for Android 8
  
  PLATFORM=$NDK/platforms/android-8/arch-arm/
  
  PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows
  
  
  
  function build_one
  
  {
  
  ./configure --target-os=linux \
  
      --prefix=$PREFIX \
  
      --enable-cross-compile \
  
      --extra-libs="-lgcc" \
  
      --enable-asm \
  
      --enable-neon \
  
      --arch=armv7 \
  
      --cpu=cortex-a8 \
  
      --enable-memalign-hack \
  
      --cc=$PREBUILT/bin/arm-linux-androideabi-gcc \
  
      --cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
  
      --nm=$PREBUILT/bin/arm-linux-androideabi-nm \
  
      --sysroot=$PLATFORM \
  
      --extra-cflags="$OPTIMIZE_CFLAGS" \
  
      --disable-shared \
  
      --enable-memalign-hack \
  
      --enable-static \
  
      --extra-ldflags="-Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -nostdlib -lc -lm -ldl -llog" \
  
      --disable-everything \
  
      --enable-demuxer=mov \
  
      --enable-demuxer=h264 \
  
      --disable-ffplay \
  
      --enable-protocols \
  
      --enable-avformat \
  
      --enable-avcodec \
  
      --enable-decoder=rawvideo \
  
      --enable-decoder=mjpeg \
  
      --enable-decoder=h263 \
  
      --enable-decoder=mpeg4 \
  
      --enable-decoder=h264 \
  
      --enable-parser=h264 \
  
      --disable-network \
  
      --enable-zlib \
  
      --disable-avfilter \
  
      --disable-avdevice \
  
  $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
  
  
  
  #Old Prebuilt (R8)
  
  $PREBUILT/bin/arm-linux-androideabi-ar d libavcodec/libavcodec.a inverse.o
  
  $PREBUILT/bin/arm-linux-androideabi-ld -rpath-link=$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/arm-linux-androideabi/4.4.3/libgcc.a
  
  }
  
  
  
  #arm v7n
  
  CPU=armv7-a
  
  OPTIMIZE_CFLAGS='-I$PLATFORM/usr/include -mfpu=neon -mfloat-abi=softfp -O3 -fpic -DANDROID -DHAVE_SYS_UIO_H=1 -Dipv6mr_interface=ipv6mr_ifindex -fasm -Wno-psabi -fno-short-enums -fno-strict-aliasing -finline-limit=300'
  
  PREFIX=./android/$CPU 
  
  build_one

  With this option, on optimize_cflags, -mfpu=neon, the build fails with those errors :

  CP ffprobe
  STRIP ffprobe
  INSTALL install-progs-yes
  INSTALL ffprobe
  libavcodec/libavcodec.a(fft_fixed_init_arm.o) : In function

  ff_fft_fixed_init_arm':
C:\Arnaud\Private\Android\DVBStream\jni\ffmpeg-0.11.1/libavcodec/arm/fft_fixed_init_arm.c:36: undefined reference to

  ff_fft_fixed_calc_neon'
  libavcodec/libavcodec.a(fft_init_arm.o) : In function

  ff_fft_init_arm':
C:\Arnaud\Private\Android\DVBStream\jni\ffmpeg-0.11.1/libavcodec/arm/fft_init_arm.c:47: undefined reference to

  ff_fft_permute_neon'
  C :\Arnaud\Private\Android\DVBStream\jni\ffmpeg-0.11.1/libavcodec/arm/fft_init_arm.c:47 : undefined reference to `ff_fft_calc_neon'

  Seems that some dependencies are missing / not set. Do you have any clue what's happening / how to build with neon ?