MatroskaVideoStereoModeType  152 libavformat/matroska.c int ff_mkv_stereo3d_conv(AVStream *st, MatroskaVideoStereoModeType stereo_mode)
MatroskaVideoStereoModeType  381 libavformat/matroska.h int ff_mkv_stereo3d_conv(AVStream *st, MatroskaVideoStereoModeType stereo_mode);
MatroskaVideoStereoModeType 1026 libavformat/matroskaenc.c     MatroskaVideoStereoModeType format = MATROSKA_VIDEO_STEREOMODE_TYPE_NB;