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• Cross-compiling librtmp for android

  4 février 2014, par Dan Turner

  Has anybody out there successfully cross-compiled librtmp for the Android platform ? I know that the rtmpdump android download has librtmp.so included, but I think I need librtmp.a also (I am trying to cross-compile ffmpeg with librtmp support).

  Anybody had any luck with this ? It's driving me bonkers....

  Ta

  Dan

• Webm video playing video & audio in Movies & TV app but will only play video in windows media player and html ?

  24 décembre 2019, par Kate LeVering

  I have created a webm video file with transparency with ffmpeg out of a series of png files. Then I add the audio track again in ffmpeg (I have tried both the opus and vorbis codecs). When I play it in the Movies & TV app it plays just fine (audio and video). In windows media player only the video plays. In html (inside a video tag) the video will play if it is set to ’muted’ but if it is not muted it doesn’t play.

  I am not sure what is going on. Does anyone have any insights. Do I need to run the audio from a seperate file ?

  Thanks, Kate

• can't find NDK camera and media native API symbols when linking libavdevice.a to libffmpeg.so

  4 septembre 2018, par jianwen

  I’m using NDK tools to build ffmpeg shared lib which will be used in my
  android rtsp project.All needed components are compiled/linked as seperate
  static libs, and at last these libs will be linked as a single shared lib.
  Everything goes well except the last step. error happens when linking
  libavdevice, all symbols in NDK camera and media can not be found, error
  log :

  libavdevice/android_camera.c:702: error: undefined reference    
  
  to 'ACameraCaptureSession_stopRepeating'
  
  libavdevice/android_camera.c:706: error: undefined reference 
  
  to 'ACameraCaptureSession_close'
  
  libavdevice/android_camera.c:711: error: undefined reference 
  
  to 'ACaptureRequest_removeTarget'
  
  libavdevice/android_camera.c:712: error: undefined reference
  
  to 'ACaptureRequest_free'
  
  libavdevice/android_camera.c:717: error: undefined reference 
  
  to 'ACameraOutputTarget_free'
  
  libavdevice/android_camera.c:722: error: undefined reference 
  
  to 'ACaptureSessionOutputContainer_remove'
  
  libavdevice/android_camera.c:724: error: undefined reference 
  
  to 'ACaptureSessionOutput_free'
  
  libavdevice/android_camera.c:729: error: undefined reference 
  
  to 'ANativeWindow_release'
  
  libavdevice/android_camera.c:734: error: undefined reference 
  
  to 'ACaptureSessionOutputContainer_free'
  
  libavdevice/android_camera.c:739: error: undefined reference 
  
  to 'ACameraDevice_close'
  
  libavdevice/android_camera.c:744: error: undefined reference 
  
  to 'AImageReader_delete'
  
  libavdevice/android_camera.c:749: error: undefined reference 
  
  to 'ACameraMetadata_free'
  
  libavdevice/android_camera.c:756: error: undefined reference
  
  to 'ACameraManager_delete'
  
  libavdevice/android_camera.c:172: error: undefined reference
  
  to 'ACameraDevice_getId'
  
  libavdevice/android_camera.c:163: error: undefined reference
  
  to 'ACameraDevice_getId'
  
  libavdevice/android_camera.c:392: error: undefined reference
  
  to 'AImageReader_acquireLatestImage'
  
  libavdevice/android_camera.c:483: error: undefined reference  
  
  to 'AImage_delete'
  
  libavdevice/android_camera.c:345: error: undefined reference
  
  to 'AImage_getPlanePixelStride'
  
  libavdevice/android_camera.c:346: error: undefined reference
  
  to 'AImage_getPlaneData'
  
  ...

  Here is my build script which is ran on my Windows 7 x86_64 PC.

  #!/bin/bash
  
  export TMPDIR=D:/other/AndroidDevelopment/ffmpeg-4.0.2/ffmpegtemp 
  
  NDK=D:/software/app/android_sdk/ndk-bundle
  
  SYSROOT=$NDK/platforms/android-28/arch-x86_64/
  
  TOOLCHAIN=$NDK/toolchains/x86_64-4.9/prebuilt/windows-x86_64
  
  CPU=x86_64
  
  PREFIX=./android/$CPU
  
  
  
  function build_one
  
  {
  
      ./configure \
  
      --prefix=$PREFIX \
  
      --enable-static \
  
      --enable-jni \
  
      --enable-pthreads \
  
      --enable-mediacodec \
  
      --disable-asm \
  
      --disable-shared \
  
      --disable-doc \
  
      --disable-ffmpeg \
  
      --disable-ffplay \
  
      --disable-ffprobe \
  
      --disable-doc \
  
      --disable-symver \
  
      --cross-prefix=$TOOLCHAIN/bin/x86_64-linux-android- \
  
      --target-os=android \
  
      --arch=x86_64 \
  
      --enable-cross-compile \
  
      --sysroot=$SYSROOT \
  
      --extra-cflags=" -isysroot $NDK/sysroot  -I$NDK/sysroot/usr/include/x86_64-linux-android" \
  
      --extra-ldflags=-pie 
  
  make clean
  
  make -j4
  
  make install
  
  
  
  $TOOLCHAIN/bin/x86_64-linux-android-ld \
  
  -rpath-link=$SYSROOT/usr/lib64 \
  
  -L$SYSROOT/usr/lib64 \
  
  -L$PREFIX/lib \
  
  -soname libffmpeg.so -shared -nostdlib -Bsymbolic --whole-archive --no- undefined -o \
  
  $PREFIX/libffmpeg.so \
  
  libavcodec/libavcodec.a \
  
  libavfilter/libavfilter.a \
  
  libswresample/libswresample.a \
  
  libavformat/libavformat.a \
  
  libavutil/libavutil.a \
  
  libswscale/libswscale.a \
  
  libavdevice/libavdevice.a \
  
  -lc -lm -lz -ldl -llog --dynamic-linker=/system/bin/linker \
  
  $TOOLCHAIN/lib/gcc/x86_64-linux-android/4.9.x/libgcc.a \
  
  }
  
  build_one