From 9e44ab7a2454e5ef1448b1c2052d8ef0da13bb35 Mon Sep 17 00:00:00 2001
From: Urban Wallasch <urban.wallasch@freenet.de>
Date: Tue, 1 Jun 2021 16:15:40 +0200
Subject: [PATCH] * Fixed default return values in proc_cmd().

---
 ffpreview.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/ffpreview.py b/ffpreview.py
index 5aa4d03..acecb3e 100755
--- a/ffpreview.py
+++ b/ffpreview.py
@@ -9,7 +9,7 @@ FFpreview is distributed under the Modified ("3-clause") BSD License.
 See `LICENSE` file for more information.
 """
 
-_FFPREVIEW_VERSION = '0.4'
+_FFPREVIEW_VERSION = '0.4+'
 
 _FFPREVIEW_NAME = 'FFpreview'
 
@@ -1846,7 +1846,8 @@ def proc_cmd(cmd):
     if proc_running():
         return '', '', None
     global proc
-    retval = 0
+    retval = -1
+    stdout = stderr = ''
     try:
         eprint(1, 'run:', cmd)
         proc = Popen(cmd, shell=False, stdout=PIPE, stderr=PIPE, env=cfg['env'])
-- 
2.30.2