MATROSKA_ID_AUDIOCHANNELS  301 libavformat/matroskadec.c     { MATROSKA_ID_AUDIOCHANNELS,      EBML_UINT, 0, offsetof(MatroskaTrackAudio,channels), {.u=1} },
MATROSKA_ID_AUDIOCHANNELS  594 libavformat/matroskaenc.c                 put_ebml_uint  (pb, MATROSKA_ID_AUDIOCHANNELS    , codec->channels);