extern const ff_asf_guid ff_format_cpfilters_processed;
extern const ff_asf_guid ff_format_waveformatex;
extern const ff_asf_guid ff_format_mpeg2_video;
extern const ff_asf_guid ff_format_cpfilters_processed;
extern const ff_asf_guid ff_format_waveformatex;
extern const ff_asf_guid ff_format_mpeg2_video;