AV_IS_OUTPUT_DEVICE 1290 fftools/cmdutils.c return AV_IS_INPUT_DEVICE(avclass->category) || AV_IS_OUTPUT_DEVICE(avclass->category); AV_IS_OUTPUT_DEVICE 2255 fftools/cmdutils.c if (!fmt || !fmt->priv_class || !AV_IS_OUTPUT_DEVICE(fmt->priv_class->category))