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• 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 ?

• Can't display live streaming video from mobile to wowza streaming software

  11 février 2016, par Muthukumar S

  You have to record frame are convert to video.mp4 files. i need rtmp url live streaming videos in mp4 format. but i work in java CV 1.1 . the mp4 and flv video is working. and it can’t display(any video format) in wowza streaming engine software. thanks.

• Stream video from mobile camera to ffmpeg with NDK

  19 juillet 2013, par user2598307

  I need to create an application that captures video from a camera phone and send it to ffmpeg. Everything should be done only NDK level without SDK and Java
   The phone can be Root

  I am trying to open camera on my android device with this function "avformat_open_input()". I give this function a reference to device folder "/dev/msm_camera/" or "/dev/video0".

  I try like this :

        void Java_com_example_camera_MainActivity_testVideo(JNIEnv *env, jclass jc, jstring *filename)
  
  {
  
          av_register_all();
  
          avcodec_register_all();
  
          avformat_network_init();
  
          AVFormatContext* context = avformat_alloc_context();
  
          int video_stream_index,ret,i;
  
          AVInputFormat *input_format = NULL;
  
          const char formatName[] = "mpeg"; //for example mpeg
  
          const jbyte *str;
  
          str = (*env)->GetStringUTFChars(env, filename, NULL); //filename = "/dev/msm_camera"
  
          input_format = av_find_input_format(formatName);
  
          ret = avformat_open_input(&context, str, input_format, NULL);
  
          if (ret < 0){
  
             LOGE("Not open");
  
          }else{
  
             LOGI("camera was open");
  
          }
  
          if(avformat_find_stream_info(context,NULL) < 0){
  
             LOGE("No stream");
  
          }
  
          for(i =0;inb_streams;i++){
  
             if(context->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
  
                 video_stream_index = i;
  
          }
  
          AVPacket packet;
  
          AVFrame *pFrame;
  
          av_init_packet(&packet);
  
          pFrame = avcodec_alloc_frame();
  
  
  
                  //open output file
  
          AVOutputFormat* fmt = av_guess_format("avi", NULL, NULL);
  
          AVFormatContext* outputContext = avformat_alloc_context();
  
          outputContext->oformat = fmt;
  
          avio_open2(&outputContext->pb, "/sdcard/test.avi", AVIO_FLAG_WRITE,NULL,NULL);
  
          AVStream* stream=NULL;
  
          AVFrame * frame;
  
          frame = avcodec_alloc_frame();
  
          int cnt = 0, frameDecoded;
  
  
  
                  //start reading packets from stream and write them to file
  
          av_read_play(context);
  
          while(av_read_frame(context,&packet)>=0 && cnt <300){ //Here function return -1
  
            if(packet.stream_index == video_stream_index)
  
            {//packet is video
  
              if(stream == NULL){
  
                 //create stream in file
  
                       stream = avformat_new_stream(outputContext,context->streams[video_stream_index]->codec->codec);
  
                       avcodec_copy_context(stream->codec,context->streams[video_stream_index]->codec);
  
                       stream->sample_aspect_ratio = context->streams[video_stream_index]->codec->sample_aspect_ratio;
  
                       avformat_write_header(outputContext,NULL);
  
               }
  
               packet.stream_index = stream->id;
  
               av_write_frame(outputContext,&packet);
  
               cnt++;
  
             }
  
             av_free_packet(&packet);
  
             av_init_packet(&packet);
  
          }
  
          av_read_pause(context);
  
          av_write_trailer(outputContext);
  
          avio_close(outputContext->pb);
  
          avformat_free_context(outputContext);         
  
   }

  As I know, we cannot get access to camera because my program has not root permission. So how I can give my program root permission ? Or how I can go around this problem ?

  I also tried to interact with the device driver using ioctl commands on C\C++, but I did not succeed because I have no experience and examples in Google.

  Thank you !!!