Now supports both old and new AVConv versions

Added unitary test to ensure that the version check of AVConv works fine

src/devedeng/avbase.py

@@ -0,0 +1,62 @@
+#!/usr/bin/env python3
+
+# Copyright 2014 (C) Raster Software Vigo (Sergio Costas)
+#
+# This file is part of DeVeDe-NG
+#
+# DeVeDe-NG is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# DeVeDe-NG is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>
+
+import devedeng.executor
+import subprocess
+
+class avbase(devedeng.executor.executor):
+
+    def check_version(self,cmd):
+
+        try:
+            handle = subprocess.Popen(cmd, stdout = subprocess.PIPE, stderr = subprocess.PIPE)
+            (stdout, stderr) = handle.communicate()
+            if 0 != handle.wait():
+                return False
+        except:
+            return False
+        self.check_version_txt(stdout)
+
+
+    def check_version_txt(self,vtext):
+
+        self.major_version = 0
+        self.minor_version = 0
+       
+        for line in vtext:
+            if (line.startswith("avconv version")):
+                pos1 = line.find('.',15)
+                pos2 = line.find('-',15)
+                if (pos2 == -1):
+                    return False
+                try:
+                    if (pos1 == -1):
+                        major = int(line[15:pos2].strip())
+                        minor = 0
+                    else:
+                        major = int(line[15:pos1].strip())
+                        minor = int(line[pos1+1:pos2].strip())
+                except:
+                    return False
+                self.major_version = major
+                self.minor_version = minor
+                return True
+        return False
+
+