bool VideoFileWriter::writeToFile(const VideoFrame &frame){
    av_init_packet(&mPacket);
    mPacket.data = NULL;
    mPacket.size = 0;
    mPacket.pts = ++mFrameCounter;
    mPacket.dts=mPacket.pts;
    mFrame->pts=++mFrameCounter;
    const uchar *rgb=frame.bits();
    QSize size=frame.size();

    int inputStride[4] = { size.width()*4, 0, 0, 0 };

    if(rgb && mScaler &&  ((int)mFrame->linesize[0])==size.width())
        sws_scale(mScaler, &rgb, inputStride, 0, size.height(), //convert RGBA to YUV
                  mFrame->data, mFrame->linesize);


    int gotFrame = 0;
    int ret =avcodec_encode_video2(mCodecContext, &mPacket, mFrame, &gotFrame);

    if (ret == 0) {
        if (gotFrame) {
                    m_file.write((const char *)mPacket.data, mPacket.size);
        }

        av_free_packet(&mPacket);
        return true;
    } else {
        return false;
    }
}