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• Undefined symbol : _avformat_alloc_context [on hold]

  12 septembre 2019, par Ahtazaz khan

  I’m trying to integrate FFmpeg library in my Xcode project, And following this Stackoverflow Question. As I have integrated successfully by following every step from that Question, But at the end got this compiler error.

  Undefined symbols for architecture arm64:
  
    "_avformat_alloc_context", referenced from:
  
        SwiftFFmeg.AppDelegate.application(_: __C.UIApplication, didFinishLaunchingWithOptions: [__C.UIApplicationLaunchOptionsKey : Any]?) -> Swift.Bool in AppDelegate.o
  
  ld: symbol(s) not found for architecture arm64
  
  clang: error: linker command failed with exit code 1 (use -v to see invocation)

  Here is a screenshot of Compiler Error.
  

  Any Help will be highly appreciated. Thanks

• Android FFMPEG build for arm64 failed with error ?

  26 août 2019, par bharat aghera

  I have made ffmpeg build with following build script.
  https://github.com/Free-Syj/ffmpeg-build-script/blob/master/build-android-ffmpeg.sh

  It worked for armv7.
  when I tried to make for arm64 architecture, it gave me following error.

  NDK/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64/bin/aarch64-linux-android-gcc is unable to create an executable file.

  Edited : -

  Following build script has been used to make the build.

  NDK=/Users/tapansodha/Documents/Softwares/AndroidStudio/adt-bundle-mac-x86_64-20140702/android-ndk-r10e
  
  function build_one
  
  {
  
  ./configure --target-os=linux \
  
  --prefix=$PREFIX \
  
  --enable-cross-compile \
  
  --extra-libs="-lgcc" \
  
  --arch=arm \
  
  --cc=$CC \
  
  --cross-prefix=$PREBUILT/bin/aarch64-linux-android- \
  
  --nm=$NM \
  
  --sysroot=$PLATFORM \
  
  --extra-cflags=" -O3 -fpic -DANDROID -DHAVE_SYS_UIO_H=1 -Dipv6mr_interface=ipv6mr_ifindex -fasm -Wno-psabi -fno-short-enums -fno-strict-aliasing -finline-limit=300 $OPTIMIZE_CFLAGS " \
  
  --enable-shared \
  
  --disable-static \
  
  --extra-ldflags="-Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -nostdlib -lc -lm -ldl -llog" \
  
  --disable-everything \
  
  --disable-debug \
  
  --disable-programs \
  
  --disable-doc \
  
  --enable-decoder=h264 \
  
  --enable-decoder=mjpeg \
  
  --enable-decoder=mpeg4 \
  
  --enable-decoder=mxpeg \
  
  --enable-decoder=aac \
  
  $ADDITIONAL_CONFIGURE_FLAG
  
  
  
  make clean
  
  make  -j4 install
  
  }
  
  
  
  #arm arm64-v8a
  
  PLATFORM=$NDK/platforms/android-21/arch-arm64/
  
  PREBUILT=$NDK/toolchains/aarch64-linux-android-4.9/prebuilt/darwin-x86_64
  
  CC=$PREBUILT/bin/aarch64-linux-android-gcc
  
  NM=$PREBUILT/bin/aarch64-linux-android-nm
  
  CPU=arm64
  
  PREFIX=./android_arm64n/$CPU
  
  ADDITIONAL_CONFIGURE_FLAG=
  
  build_one

• FFMPEG : How to output image2 format into a tcp/udp socket ?

  5 août 2019, par Sagi Mann

  I’ve got ffmpeg to read some RTSP stream and output image2 format to stdout like so :

  ffmpeg -rtsp_transport tcp -i  "rtsp:xxxxx" -f image2 -update 1 -

  But stdout is not good enough for me.. I am trying to pass it to "push" it to some other process that I cannot "pipe" to ffmpeg due to some architecture constraints. I am running on Linux so I was hoping to simulate some tcp/udp socket via the file system e.g. /dev/somthing or similar. Alternatively, maybe it’s possible to get ffmpeg to send the image directly to a given tcp/udp address ? This didn’t work though (ffmpeg expects a file output) :

  ffmpeg -rtsp_transport tcp -i  "rtsp:xxxxx" -f image2 -update 1 "udp://localhost:3333"

  Any ideas ?
  Thanks