ff_thread_can_start_frame  700 libavcodec/h264_slice.c     if (!ff_thread_can_start_frame(h->avctx)) {
ff_thread_can_start_frame  219 libavcodec/internal.h int ff_thread_can_start_frame(AVCodecContext *avctx);
ff_thread_can_start_frame 1775 libavcodec/mpegvideo.c     if (!ff_thread_can_start_frame(avctx)) {