From b737d2878091818b6083326b60f87eb277e9c758 Mon Sep 17 00:00:00 2001
From: Tobias Jakobs <tobias.jakobs@gmail.com>
Date: Fri, 26 Dec 2014 19:05:20 +0100
Subject: [PATCH] add checkIfBinExists

---
 contrib/video.lua | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/contrib/video.lua b/contrib/video.lua
index f981f5e..c94ab5e 100644
--- a/contrib/video.lua
+++ b/contrib/video.lua
@@ -37,7 +37,29 @@ local function show_status(storage, image, format, filename, number, total, high
     dt.print("Export Image "..tostring(number).."/"..tostring(total))
 end
 
+local function checkIfBinExists(bin)
+    local handle = io.popen("which "..bin)
+    local result = handle:read()
+    local ret
+    handle:close()
+    if (not result) then
+        dt.print_error(bin.." not found")
+        ret = false
+    end
+    ret = true
+    return ret
+end
+
 local function create_video(storage, image_table, extra_data)
+    if not checkIfBinExists("mencoder") then
+        return
+    end
+    if not checkIfBinExists("xdg-open") then
+        return
+    end
+    if not checkIfBinExists("xdg-user-dir") then
+        return
+    end
 
     exportDirectory = dt.preferences.read("video","ExportDirectory","string")
     exportFilename = "output.avi"