avformat_find_stream_info(pCtx->pFormatCtx, NULL);

	// Find the first video stream.

	for (unsigned int i = 0; i < pCtx->pFormatCtx->nb_streams; i++) {
		pCodecCtx = pCtx->pFormatCtx->streams[i]->codec;
		if (pCodecCtx->codec_type == AVMEDIA_TYPE_VIDEO) {
			// CODEC_TYPE_VIDEO replaced with AVMEDIA_TYPE_VIDEO
			// http://ffmpeg.org/pipermail/ffmpeg-cvslog/2011-February/034213.html
			pCtx->VideoStreamIdx = i;
			pCtx->pCodecCtx = pCodecCtx;
			break;
		}
	}