Method initializeVideo

libffmpegthumbnailer/moviedecoder.cpp:167–204

}

void MovieDecoder::initializeVideo(bool preferEmbeddedMetadata)
{
    m_VideoStream = findPreferredVideoStream(preferEmbeddedMetadata);

    if (m_VideoStream < 0) {
        destroy();
        throw logic_error("Could not find video stream");
    }

    m_pVideoStream = m_pFormatContext->streams[m_VideoStream];
    m_pVideoCodec  = avcodec_find_decoder(m_pVideoStream->codecpar->codec_id);

    if (m_pVideoCodec == nullptr) {
        // set to nullptr, otherwise avcodec_close(m_pVideoCodecContext) crashes
        m_pVideoCodecContext = nullptr;
        destroy();
        throw logic_error("Video Codec not found");
    }

    m_pVideoCodecContext = avcodec_alloc_context3(m_pVideoCodec);

    if (m_pVideoCodecContext == nullptr) {
        destroy();
        throw logic_error("Could not allocate video codec context");
    }

    if (avcodec_parameters_to_context(m_pVideoCodecContext, m_pVideoStream->codecpar) < 0) {
        destroy();
        throw logic_error("Could not configure video codec context");
    }

    m_pVideoCodecContext->workaround_bugs = 1;

    if (avcodec_open2(m_pVideoCodecContext, m_pVideoCodec, nullptr) < 0) {
        destroy();
        throw logic_error("Could not open video codec");
    }
}

std::string MovieDecoder::createScaleString(const std::string& sizeString, bool maintainAspectRatio)
{