mf_get_tb         112 libavcodec/mfenc.c     return av_rescale_q(av_pts, mf_get_tb(avctx), MF_TIMEBASE);
mf_get_tb         124 libavcodec/mfenc.c     return av_rescale_q(stime, MF_TIMEBASE, mf_get_tb(avctx));