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• ffmpeg-next how can I enable multithreading on a decoder ?

  14 décembre 2022, par Brandon Piña

  I'm using the rust crate ffmpeg-next to decode some video into individual frames for usage in another library. Problem is when I run my test it only seems to use a single core. I've tried modifying the threading configuration for my decoder as you can see below, but It doesn't seem to be do anything

  


          let context_decoder =
            ffmpeg_next::codec::context::Context::from_parameters(input_stream.parameters())?;
        let mut decoder = context_decoder.decoder().video()?;
        let mut threading_config = decoder.threading();
        threading_config.count = num_cpus::get();
        threading_config.kind = ThreadingType::Frame;

        decoder.set_threading(threading_config);


  


• related to homebrew, ffmpeg and imagemagick [closed]

  25 août 2024, par Ansh Rathod

  I installed ImageMagick using Homebrew. If I zip the Homebrew ImageMagick folder and transfer it to another machine, will it work there ?

  


  For my app, I download FFmpeg to the user’s documents folder from GitHub (I zipped FFmpeg from the Homebrew install folder on my machine) and run the commands from within the app. I’m considering doing something similar with ImageMagick. Will this approach work for every mac for my app's user ?

  


  I' don't think FFmpeg wouldn't work either because when you install the FFmpeg/imagemagick it installs python,rust and other stuff. how should I approach this can someone guide me through ?

  


  PS : I can't bundle this on my app directly.

  


• Linking to static libs cross compiled for android complains "no archive symbol table (run ranlib)"

  5 octobre 2017, par Programist

  I am trying to build FFmpeg for android as static libraries. Following is my buildscript.sh

  #!/bin/bash
  
  
  
  cd ffmpeg-3.3
  
  
  
  NDK=/Users/sambitpujari/codeenv/ndk/android-ndk-r15c
  
  SYSROOT=$NDK/platforms/android-26/arch-arm/
  
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64
  
  CPREFIX=$TOOLCHAIN/bin/arm-linux-androideabi-ar
  
  
  
  function build_ffmpeg_android {
  
  
  
  ./configure \
  
    --prefix=$PREFIX \
  
    --disable-programs \
  
    --enable-static \
  
    --disable-shared \
  
    --disable-doc \
  
    --enable-postproc \
  
    --enable-swscale \
  
    --enable-avfilter \
  
    --enable-avresample \
  
    --enable-pic \
  
    --disable-opencl \
  
    --disable-securetransport \
  
    --enable-videotoolbox \
  
    --enable-audiotoolbox \
  
    #--enable-libx264 \
  
    --cross-prefix=$CPREFIX \
  
    --target-os=linux \
  
    --arch=arm \
  
    --enable-cross-compile \
  
    --enable-gpl \
  
    --sysroot=$SYSROOT \
  
    --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
  
    --extra-ldflags="$ADDI_LDFLAGS" \
  
    $ADDITIONAL_CONFIGURE_FLAG
  
    make clean
  
    make -j9
  
    make install
  
  }
  
  
  
  CPU=arm
  
  PREFIX=$(pwd)/android/$CPU
  
  ADDI_CFLAGS="-marm"
  
  
  
  build_ffmpeg_android

  The output of above script is placed inside ffmpeg-3.3/android/arm.

  Problem :
  When trying to link to these .a libraries from my app (-lavformat -lavcodec -lswscale -lavutil -lavfilter -lswresample -lavdevice),
  I get the following linker error for each of them

  :-1: error: error: avformat: no archive symbol table (run ranlib)
  
  :-1: error: error: avcodec: no archive symbol table (run ranlib)
  
  :-1: error: error: swscale: no archive symbol table (run ranlib)
  
  :-1: error: error: avutil: no archive symbol table (run ranlib)
  
  :-1: error: error: avfilter: no archive symbol table (run ranlib)
  
  :-1: error: error: swresample: no archive symbol table (run ranlib)
  
  :-1: error: error: avdevice: no archive symbol table (run ranlib)

  Looking at this discussion, I am doing it correct by selecting arm-linux-androideabi-ar in CPREFIX.

  Question :
  What else am I missing here ? What is needed in my buildscript.sh to satisfy correct linking ?