public static extern int avformat_query_codec(AVOutputFormat* ofmt, AVCodecID codec_id, int std_compliance);
public static extern AVCodecID av_guess_codec(AVOutputFormat* fmt, String short_name, String filename, String mime_type, AVMediaType type);
public static extern int avformat_alloc_output_context2(AVFormatContext** ctx, AVOutputFormat* oformat, String format_name, String filename);
public static extern AVFormatContext* avformat_alloc_output_context(String format, AVOutputFormat* oformat, String filename);
public static extern AVOutputFormat* av_oformat_next(AVOutputFormat* f);
public static extern void av_register_output_format(AVOutputFormat* format);