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• how to use ffmpeg library to stream audio from mms links on Android ?

  3 juillet 2012, par Caique

  i have searched a lot about the ffmpeg library. I have already installed it, the android ndk too... and i don't know how to stream links mms. I understand that it uses native methods, but i never used native methods before, how we can use ? anyone already did something like ?
  what i need is play a radio from a url, what uses mms protocol, is there a way to do it with ffmpeg library ? apparently, in the iphone is so simple to use this library.
  i know that is possible with the vitamio plugin, but i want to know how to use with the ffmpeg library.
  sorry for my english
  thanks

• Embedding SMPTE 336M KLV data into video

  8 décembre 2023, par Mateo

  I have a drone video in .MP4 format, and an accompanying log file containing various timecoded data, e.g. GPS location, altitude.

  



  I need to embed the data into the video in the SMPTE 336M (KLV Data Encoding Protocol Using Key-Length-Value) standard format.

  



  I've successfully extracted KLV data from a MPEG2-TS file using FFMPEG and a parser in Node.

  



  Now I need to go the other way : to generate KLV data from my log file and insert it into the relevant video. How this is done ?

  


• ffmpeg ndk multiple definition libavcodec.a(golomb.o)

  4 décembre 2014, par WLGfx

  I’m trying to link ffmpeg as static libraries with android NDK but I’m getting ’multiple definition’ error’ errors as below. I’ve also included my build script which runs through everything just fine but when I come to using the libraries in Eclipse with the ADT plugin, I can’t get anywhere.

  From this it looks like it wants something to do with VLC. I don’t want anything to do with VLC, just ffmpeg for video streaming. Everything works fine with shared libraries, but I’m after a very tiny player because I’m restricted to space on the device.

  EDIT : Also ’log2_tab_tab.o’ has multiple definitions.

  error: jni/libs\libavcodec.a(golomb.o): multiple definition of 'ff_golomb_vlc_len'  Ffplayer            C/C++ Problem
  
  error: jni/libs\libavcodec.a(golomb.o): multiple definition of 'ff_interleaved_dirac_golomb_vlc_code'   Ffplayer            C/C++ Problem
  
  error: jni/libs\libavcodec.a(golomb.o): multiple definition of 'ff_interleaved_golomb_vlc_len'  Ffplayer            C/C++ Problem
  
  error: jni/libs\libavcodec.a(golomb.o): multiple definition of 'ff_interleaved_se_golomb_vlc_code'  Ffplayer            C/C++ Problem
  
  error: jni/libs\libavcodec.a(golomb.o): multiple definition of 'ff_interleaved_ue_golomb_vlc_code'  Ffplayer            C/C++ Problem
  
  error: jni/libs\libavcodec.a(golomb.o): multiple definition of 'ff_se_golomb_vlc_code'  Ffplayer            C/C++ Problem
  
  error: jni/libs\libavcodec.a(golomb.o): multiple definition of 'ff_ue_golomb_len'   Ffplayer            C/C++ Problem
  
  error: jni/libs\libavcodec.a(golomb.o): multiple definition of 'ff_ue_golomb_vlc_code'  Ffplayer            C/C++ Problem
  
  error: jni/libs\libavcodec.a(log2_tab.o): multiple definition of 'ff_log2_tab'  Ffplayer            C/C++ Problem
  
  error: jni/libs\libavformat.a(log2_tab.o): multiple definition of 'ff_log2_tab' Ffplayer            C/C++ Problem
  
  jni/libs\libavformat.a(golomb_tab.o): previous definition here  Ffplayer            C/C++ Problem
  
  jni/libs\libavutil.a(log2_tab.o): previous definition here  Ffplayer            C/C++ Problem
  
  make.exe: *** [obj/local/armeabi-v7a-hard/libffplayer.so] Error 1   Ffplayer            C/C++ Problem

  Using the latest branch of ffmpeg (2.4.3) my build script for Android (using toolchain 8 because it’s old hardware I’m working with) and wanting the NEON hardware support :

  export ANDROID_NDK=/home/carl/dev/ndk
  
  export TOOLCHAIN=/home/carl/temp/ffmpeg
  
  export SYSROOT=$TOOLCHAIN/sysroot/
  
  $ANDROID_NDK/build/tools/make-standalone-toolchain.sh \
  
      --platform=android-8 --install-dir=$TOOLCHAIN
  
  
  
  export PATH=$TOOLCHAIN/bin:$PATH
  
  export CC=arm-linux-androideabi-gcc
  
  export LD=arm-linux-androideabi-ld
  
  export AR=arm-linux-androideabi-ar
  
  
  
  CFLAGS="-O3 -Wall -mthumb -pipe -fpic -fasm \
  
    -finline-limit=300 -ffast-math \
  
    -fstrict-aliasing -Werror=strict-aliasing \
  
    -fmodulo-sched -fmodulo-sched-allow-regmoves \
  
    -Werror=implicit-function-declaration \
  
    -Wno-psabi -Wa,--noexecstack"
  
  #  -D__ARM_ARCH_5__ -D__ARM_ARCH_5E__ \
  
  #  -D__ARM_ARCH_5T__ -D__ARM_ARCH_5TE__ \
  
  #  -DANDROID -DNDEBUG"
  
  
  
  EXTRA_CFLAGS="-march=armv7-a -mfpu=neon \
  
                -mfloat-abi=softfp -mvectorize-with-neon-quad \
  
                -DHAVE_ISNAN -DHAVE_ISINF
  
                -std=c99"
  
  EXTRA_LDFLAGS="-Wl,--fix-cortex-a8"
  
  
  
  FFMPEG_FLAGS="--prefix=/home/dev/ffmpeg/build \
  
    --target-os=linux \
  
    --arch=arm \
  
    --enable-cross-compile \
  
    --cross-prefix=arm-linux-androideabi- \
  
    --enable-shared \
  
    --enable-static \
  
    --enable-small \
  
    --disable-symver \
  
    --disable-doc \
  
    --disable-ffplay \
  
    --disable-ffmpeg \
  
    --disable-ffprobe \
  
    --disable-ffserver \
  
    --disable-avdevice \
  
    --disable-avfilter \
  
    --disable-encoders  \
  
    --disable-muxers \
  
    --disable-demuxers \
  
    --disable-filters \
  
    --disable-devices \
  
    --disable-decoders \
  
    --enable-decoder=mjpeg \
  
    --enable-decoder=mp1 \
  
    --enable-decoder=mp2 \
  
    --enable-decoder=mp3 \
  
    --enable-decoder=mpeg1_vdpau \
  
    --enable-decoder=mpeg1video \
  
    --enable-decoder=mpeg2video \
  
    --enable-decoder=mpeg4 \
  
    --enable-decoder=mpeg4_vdpau \
  
    --enable-decoder=mpegvideo \
  
    --enable-decoder=mpeg_xvmc \
  
    --enable-decoder=h261 \
  
    --enable-decoder=h263 \
  
    --enable-decoder=h263i \
  
    --enable-decoder=h263p \
  
    --enable-hwaccel=h263_vaapi \
  
    --enable-hwaccel=h263_vdpau \
  
    --enable-hwaccel=mpeg1_vdpau \
  
    --enable-hwaccel=mpeg1_xvmc \
  
    --enable-hwaccel=mpeg2_dxva2 \
  
    --enable-hwaccel=mpeg2_vaapi \
  
    --enable-hwaccel=mpeg2_vdpau \
  
    --enable-hwaccel=mpeg2_xvmc \
  
    --enable-hwaccel=mpeg4_vaapi \
  
    --enable-hwaccel=mpeg4_vdpau \
  
    --enable-demuxer=aac \
  
    --enable-demuxer=ac3 \
  
    --enable-demuxer=h261 \
  
    --enable-demuxer=h263 \
  
    --enable-demuxer=pcm_s16be \
  
    --enable-demuxer=pcm_s16le \
  
    --enable-demuxer=pcm_s8 \
  
    --enable-demuxer=mpegps \
  
    --enable-demuxer=mpegts \
  
    --enable-demuxer=mpegtsraw \
  
    --enable-demuxer=mpegvideo \
  
    --enable-demuxer=rtp \
  
    --enable-demuxer=rtsp \
  
    --enable-parser=aac \
  
    --enable-parser=mpegvideo \
  
    --enable-parser=ac3 \
  
    --enable-parser=h261 \
  
    --enable-parser=h263 \
  
    --enable-parser=mjpeg \
  
    --enable-parser=mpeg4video \
  
    --enable-parser=mpegaudio \
  
    --enable-protocol=rtp \
  
    --enable-protocol=file \
  
    --enable-protocol=ftp \
  
    --enable-protocol=tcp \
  
    --enable-protocol=http \
  
    --enable-protocol=udp \
  
    --enable-protocol=pipe \
  
    --enable-protocol=unix \
  
    --enable-network \
  
    --disable-swscale  \
  
    --enable-asm \
  
    --enable-memalign-hack \
  
    --disable-golomb \
  
    --enable-stripping \
  
    --enable-pthreads \
  
    --disable-symver \
  
    --enable-version3"
  
  
  
  ./configure $FFMPEG_FLAGS --extra-cflags="$CFLAGS $EXTRA_CFLAGS" \
  
    --extra-ldflags="$EXTRA_LDFLAGS"
  
  
  
  make clean
  
  echo "Project now cleaned"
  
  make -j4
  
  
  
  echo "Stripping multiple references from libraries"
  
  arm-linux-androideabi-ar d libavcodec.a log2_tab.o
  
  arm-linux-androideabi-ar d libavutil.a log2_tab.o
  
  
  
  echo "Done..."

  And this is the Android.mk file which works fine.

  LOCAL_PATH := $(call my-dir)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE    := avutil
  
  LOCAL_SRC_FILES := libs\libavutil.a
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE    := avformat
  
  LOCAL_SRC_FILES := libs\libavformat.a
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE    := avcodec
  
  LOCAL_SRC_FILES := libs\libavcodec.a
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  
  
  LOCAL_MODULE    := ffplayer
  
  LOCAL_SRC_FILES := ffplayer.cpp
  
  
  
  LOCAL_C_INCLUDES := C:\DEV\ffmpeg\
  
  
  
  LOCAL_LDLIBS    += -llog -ljnigraphics -lGLESv2 -ldl
  
  LOCAL_LDLIBS    += -lstdc++ -lc
  
  LOCAL_LDLIBS    += -lz -lm
  
  
  
  LOCAL_WHOLE_STATIC_LIBRARIES += libavutil libavformat libavcodec
  
  
  
  include $(BUILD_SHARED_LIBRARY)

  If anybody can spot what’s wrong with this it would be so appreciated.