add option to run locally

scripts/mac_check_deps.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+if ! brew list srt &>/dev/null; then
+    echo "ERROR you must install srt"
+    echo "brew install srt"
+    exit 1
+fi
+
+if ! brew list ffmpeg &>/dev/null; then
+    echo "ERROR you must install ffmpeg"
+    echo "brew install ffmpeg"
+    exit 1
+fi