Method UpdateVideoInfo

src/FFmpegReader.cpp:1031–1191

}

void FFmpegReader::UpdateVideoInfo() {
	if (info.vcodec.length() > 0) {
		// Skip init - if info struct already populated
		return;
	}

	auto record_duration = [](double &target, double seconds) {
		if (seconds > 0.0)
			target = std::max(target, seconds);
	};

	// Set values of FileInfo struct
	info.has_video = true;
	info.file_size = pFormatCtx->pb ? avio_size(pFormatCtx->pb) : -1;
	info.height = AV_GET_CODEC_ATTRIBUTES(pStream, pCodecCtx)->height;
	info.width = AV_GET_CODEC_ATTRIBUTES(pStream, pCodecCtx)->width;
	info.vcodec = pCodecCtx->codec->name;
	info.video_bit_rate = (pFormatCtx->bit_rate / 8);

	// Frame rate from the container and codec
	AVRational framerate = av_guess_frame_rate(pFormatCtx, pStream, NULL);
	if (!check_fps) {
		info.fps.num = framerate.num;
		info.fps.den = framerate.den;
	}

	ZmqLogger::Instance()->AppendDebugMethod("FFmpegReader::UpdateVideoInfo", "info.fps.num", info.fps.num, "info.fps.den", info.fps.den);

	// TODO: remove excessive debug info in the next releases
	// The debug info below is just for comparison and troubleshooting on users side during the transition period
	ZmqLogger::Instance()->AppendDebugMethod("FFmpegReader::UpdateVideoInfo (pStream->avg_frame_rate)", "num", pStream->avg_frame_rate.num, "den", pStream->avg_frame_rate.den);

	if (pStream->sample_aspect_ratio.num != 0) {
		info.pixel_ratio.num = pStream->sample_aspect_ratio.num;
		info.pixel_ratio.den = pStream->sample_aspect_ratio.den;
	} else if (AV_GET_CODEC_ATTRIBUTES(pStream, pCodecCtx)->sample_aspect_ratio.num != 0) {
		info.pixel_ratio.num = AV_GET_CODEC_ATTRIBUTES(pStream, pCodecCtx)->sample_aspect_ratio.num;
		info.pixel_ratio.den = AV_GET_CODEC_ATTRIBUTES(pStream, pCodecCtx)->sample_aspect_ratio.den;
	} else {
		info.pixel_ratio.num = 1;
		info.pixel_ratio.den = 1;
	}
	info.pixel_format = AV_GET_CODEC_PIXEL_FORMAT(pStream, pCodecCtx);

	// Calculate the DAR (display aspect ratio)
	Fraction size(info.width * info.pixel_ratio.num, info.height * info.pixel_ratio.den);

	// Reduce size fraction
	size.Reduce();

	// Set the ratio based on the reduced fraction
	info.display_ratio.num = size.num;
	info.display_ratio.den = size.den;

	// Get scan type and order from codec context/params
	if (!check_interlace) {
		check_interlace = true;
		AVFieldOrder field_order = AV_GET_CODEC_ATTRIBUTES(pStream, pCodecCtx)->field_order;