#define MATROSKA_VIDEO_STEREO_PLANE_COUNT 3
extern const CodecTags ff_mkv_codec_tags[];
+extern const CodecTags ff_webm_codec_tags[];
extern const CodecMime ff_mkv_mime_tags[];
extern const CodecMime ff_mkv_image_mime_tags[];
extern const AVMetadataConv ff_mkv_metadata_conv[];