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• Create WebM with FFmpeg programatically

  25 janvier 2012, par Kage

  I have VP8 encoded frames that so far I am saving into IVF format, however, I want to take these frames and put them into a WebM format.

  I am using FFmpeg programmatically on Android with libvpx enabled.

  I really have no idea how to put my frames into a WebM file and there is so little information out there about this.

  Could anyone help me in the right direction or provide me with a link to some help ?

  Edit :

  Examples of outputting encoded frames into any other container would also be appreciated

• FFMPEG with Neon Optimization

  11 juin 2015, par madadi

  I am decoding an h.264 video file on android using ffmpeg. The performace is very low. I would like to enable neon optimzation in ffmpeg to improve the performace. Inspite of adding the neon related commands in the config file, I don’t see performance gain. Can someone tell me if I am going wrong anywhere ? My config file is as given below.

      function build_one_r6
  
  {
  
  make clean
  
  ./configure \
  
      --prefix=$PREFIX \
  
      --disable-shared \
  
      --enable-static \
  
      --enable-version3 \
  
      --disable-doc \
  
      --disable-ffmpeg \
  
      --disable-ffplay \
  
      --disable-ffprobe \
  
      --disable-ffserver \
  
      --disable-avdevice \
  
      --disable-avfilter \
  
      --disable-postproc \
  
      --enable-small \
  
      --cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
  
      --enable-cross-compile \
  
      --target-os=linux \
  
      --extra-cflags="-I$PLATFORM/usr/include -fpic -DANDROID -DHAVE_SYS_UIO_H=1 -fasm -Wno-psabi -fno-short-enums -fno-strict-aliasing $OPTIMIZE_CFLAGS" \
  
      --extra-ldflags="-Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -nostdlib -lc -lm -ldl -llog" \
  
      --arch=arm \
  
      --disable-symver \
  
      --disable-debug \
  
      --disable-indevs \
  
      --disable-encoders \
  
      --disable-bsfs \
  
      --disable-filters \
  
  $ADDITIONAL_CONFIGURE_FLAG || exit 1;
  
  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  -j4 install || exit 1;
  
  $PREBUILT/bin/arm-linux-androideabi-ar d libavcodec/libavcodec.a inverse.o || exit 1;
  
  $PREBUILT/bin/arm-linux-androideabi-ld -rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib  -soname libffmpeg.so -shared -nostdlib  -z,noexecstack -Bsymbolic --whole-archive --no-undefined -o $PREFIX/lib/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 || exit 1;
  
  
  
  }
  
  
  
  
  
  #armv5te
  
  CPU=armv5te
  
  OPTIMIZE_CFLAGS="-marm -march=$CPU "
  
  PREFIX=../../build/android/armeabi
  
  ADDITIONAL_CONFIGURE_FLAG=
  
  build_one_r6
  
  
  
  
  
  #arm v7n
  
  CPU=armv7-a
  
  OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=neon -marm -march=$CPU -mtune=cortex-a8"
  
  PREFIX=../../build/android/armeabi-v7a
  
  ADDITIONAL_CONFIGURE_FLAG="--enable-neon --disable-armv5te --disable-armv6 --disable-armv6t2"
  
  build_one_r6enter code here

• FFmpeg command help and pointers for documentation

  27 novembre 2011, par mahi

  I was working with FFmpeg for one of my android project. So far, I have been able to successfully able to compile FFmpeg for ARM. Now my approach is to write a JNI interface for playing videos using FFmpeg.

  I tried executing the command ./ffmpeg --help to see the options available with FFmpeg, and so far I am only able to understand that the input filename can be provided with -i fileName option.

  I have been searching for online tutorials / blogs for FFmpeg commands, and how to play a video / RTMP stream, but couldn't find a suitable link.

  I'd like to know the following :

  1. What is the command to play a video using FFMpeg ?
  2. What is the command to play a local file using FFMpeg
  3. What is the command to play a RTMP stream using FFMpeg
  4. Java / C sample code to play video using FFMpeg
  5. Is it possible to extract some piece of code from ffplay.c and write a custom code ?

  Any help with the above and / or any pointers to relevant links is highly appreciated.

  Thanks.