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• Multiple definition of 'ff_log2_tab'

  16 mai 2016, par scooby

  I am trying to build ffmpeg for Android, which is an LGPL version. At the end, when I try to combine the *.so to form the libFFmpeg.so it is giving the following error :

  /home/kganlite/android-ndk-r9c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld : error : libavcodec/log2_tab.o : multiple definition of ’ff_log2_tab’
  /home/kganlite/android-ndk-r9c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld : libavutil/log2_tab.o : previous definition here

  /home/kganlite/android-ndk-r9c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld : error : libavcodec/reverse.o : multiple definition of ’ff_reverse’
  /home/kganlite/android-ndk-r9c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld : libavutil/reverse.o : previous definition here
  ....

  linux-androideabi/bin/ld : fatal error : /libffmpeg.so : open : Permission denied
  collect2 : ld returned 1 exit status

  I am using the following command to build the libFFMpeg.so

  arm-linux-androideabi-gcc -lm -lz -shared --sysroot=$SYSROOT -Wl,--no-undefined -Wl,-z,noexecstack $EXTRA_LDFLAGS libavutil/*.o libavutil/arm/*.o libavcodec/*.o libavcodec/arm/*.o libavformat/*.o libswresample/*.o libswscale/*.o -o $PREFIX/libffmpeg.so

  I know there are discussions regarding this issue in a few links but none of them helped for me. e.g. I tried to follow
  Unable to port FFmpeg C library into android
  but still the issue persists.

  How can I fix this ?

• How to convert cv::Mat to AVFrame in ffmpeg

  22 avril 2016, par Sagar
  • I have one cv::Mat image.Now i want to convert this mat to AVFrame in ffmpeg.

  • I have trie below code,

    void matToAVFrame(cv::Mat frame)
    
    {
    
        AVFrame *dst, *yuv422_final_frame;
    
          cv::Size frameSize = frame.size();
    
          AVCodec *encoder = avcodec_find_encoder(AV_CODEC_ID_H264);
    
          AVFormatContext* outContainer = avformat_alloc_context();
    
          AVStream *outStream = avformat_new_stream(outContainer, encoder);
    
          avcodec_get_context_defaults3(outStream->codec, encoder);
    
          dst = av_frame_alloc();
    
          outStream->codec->pix_fmt = AV_PIX_FMT_YUV420P;
    
          outStream->codec->width = frame.cols;
    
          outStream->codec->height = frame.rows;
    
          avpicture_fill((AVPicture*)dst, frame.data, AV_PIX_FMT_BGR24, outStream->codec->width, outStream->codec->height);
    
          dst->width = frameSize.width;
    
          dst->height = frameSize.height;
    
    
    
    //      av_image_alloc((uint8_t**)frame.data, dst->linesize,dst->width, dst->height,
    
    //            AV_PIX_FMT_BGR24, 32);
    
    
    
          yuv422_final_frame = av_frame_alloc();
    
          int yuv422_num_bytes = avpicture_get_size( AV_PIX_FMT_YUV420P,  dst->width, dst->height );
    
          uint8_t* final_frame2_buffer = (uint8_t *)av_malloc(yuv422_num_bytes*sizeof(uint8_t));
    
    
    
    
    
          yuv422_final_frame->width = frameSize.width;
    
          yuv422_final_frame->height = frameSize.height;
    
          avpicture_fill((AVPicture*)yuv422_final_frame, (uchar*)dst->data, AV_PIX_FMT_YUV420P,  dst->width, dst->height);
    
    
    
         SwsContext *final_sws_ctx = sws_getContext(dst->width , dst->height,
    
             AV_PIX_FMT_BGR24, dst->width, dst->height,
    
             AV_PIX_FMT_YUV420P, SWS_FAST_BILINEAR, 0, 0, 0);
    
    
    
    //     avpicture_fill((AVPicture*)dst, frame.data, AV_PIX_FMT_RGB24, dst->width, dst->height);
    
         sws_scale(final_sws_ctx, dst->data,
    
                 dst->linesize,
    
                   0, dst->height,
    
                   yuv422_final_frame->data,
    
                   yuv422_final_frame->linesize);
    
    
    
         Mat cvmImage = cv::Mat( yuv422_final_frame->height, yuv422_final_frame->width, CV_8UC3, yuv422_final_frame->data[2],
    
                 yuv422_final_frame->linesize[2]);
    
    
    
         imwrite("/home/radix/Desktop/OpenCV/cvmImage.png", cvmImage);
    
    }
    
    int main()
    
    {
    
        av_register_all();
    
        Mat frame = imread("path to image");
    
        matToAVFrame(frame);
    
    }

  but it is giving me some bad image, and in some cases it is not giving any image.
  * So please anybody tell me where i am doing wrong.Thanks !!

  • EDIT :

  • Sometimes it gives me error like [swscaler @ 0x1c9a6e0] bad src image pointers

  • So i am getting this type of output from above code.

  • Input Image :

  

  • output image :

  

• How to convert AVFrame to cv::Mat in ffmpeg

  21 avril 2016, par Sagar
  • I have one cv::Mat image.Now i want to convert this mat to AVFrame in ffmpeg.

  • I have trie below code,

    void matToAVFrame(cv::Mat frame)
    
    {
    
        AVFrame *dst, *yuv422_final_frame;
    
          cv::Size frameSize = frame.size();
    
          AVCodec *encoder = avcodec_find_encoder(AV_CODEC_ID_H264);
    
          AVFormatContext* outContainer = avformat_alloc_context();
    
          AVStream *outStream = avformat_new_stream(outContainer, encoder);
    
          avcodec_get_context_defaults3(outStream->codec, encoder);
    
          dst = av_frame_alloc();
    
          outStream->codec->pix_fmt = AV_PIX_FMT_YUV420P;
    
          outStream->codec->width = frame.cols;
    
          outStream->codec->height = frame.rows;
    
          avpicture_fill((AVPicture*)dst, frame.data, AV_PIX_FMT_BGR24, outStream->codec->width, outStream->codec->height);
    
          dst->width = frameSize.width;
    
          dst->height = frameSize.height;
    
    
    
    //      av_image_alloc((uint8_t**)frame.data, dst->linesize,dst->width, dst->height,
    
    //            AV_PIX_FMT_BGR24, 32);
    
    
    
          yuv422_final_frame = av_frame_alloc();
    
          int yuv422_num_bytes = avpicture_get_size( AV_PIX_FMT_YUV420P,  dst->width, dst->height );
    
          uint8_t* final_frame2_buffer = (uint8_t *)av_malloc(yuv422_num_bytes*sizeof(uint8_t));
    
    
    
    
    
          yuv422_final_frame->width = frameSize.width;
    
          yuv422_final_frame->height = frameSize.height;
    
          avpicture_fill((AVPicture*)yuv422_final_frame, (uchar*)dst->data, AV_PIX_FMT_YUV420P,  dst->width, dst->height);
    
    
    
         SwsContext *final_sws_ctx = sws_getContext(dst->width , dst->height,
    
             AV_PIX_FMT_BGR24, dst->width, dst->height,
    
             AV_PIX_FMT_YUV420P, SWS_FAST_BILINEAR, 0, 0, 0);
    
    
    
    //     avpicture_fill((AVPicture*)dst, frame.data, AV_PIX_FMT_RGB24, dst->width, dst->height);
    
         sws_scale(final_sws_ctx, dst->data,
    
                 dst->linesize,
    
                   0, dst->height,
    
                   yuv422_final_frame->data,
    
                   yuv422_final_frame->linesize);
    
    
    
         Mat cvmImage = cv::Mat( yuv422_final_frame->height, yuv422_final_frame->width, CV_8UC3, yuv422_final_frame->data[2],
    
                 yuv422_final_frame->linesize[2]);
    
    
    
         imwrite("/home/radix/Desktop/OpenCV/cvmImage.png", cvmImage);
    
    }
    
    int main()
    
    {
    
        av_register_all();
    
        Mat frame = imread("path to image");
    
        matToAVFrame(frame);
    
    }

  but it is giving me some bad image, and in some cases it is not giving any image.
  * So please anybody tell me where i am doing wrong.Thanks !!

  • EDIT :

  • Sometimes it gives me error like [swscaler @ 0x1c9a6e0] bad src image pointers

  • So i am getting this type of output from above code.

  • Input Image :

  

  • output image :