Remove Old Multi-Client Code / Refactoring (#13)

* Remove a lot of old code from render_queue regarding clients

* More code cleanup

* More code cleanup

* Move everything around

* Minor log change

lib/engines/ffmpeg_engine.py

@@ -0,0 +1,41 @@
+try:
+    from .base_engine import *
+except ImportError:
+    from base_engine import *
+import re
+
+
+class FFMPEG(BaseRenderEngine):
+
+    @classmethod
+    def version(cls):
+        version = None
+        try:
+            ver_out = subprocess.check_output([cls.renderer_path(), '-version'],
+                                              timeout=SUBPROCESS_TIMEOUT).decode('utf-8')
+            match = re.match(".*version\s*(\S+)\s*Copyright", ver_out)
+            if match:
+                version = match.groups()[0]
+        except Exception as e:
+            logger.error("Failed to get FFMPEG version: {}".format(e))
+        return version
+
+    @classmethod
+    def get_encoders(cls):
+        encoders_raw = subprocess.check_output([cls.renderer_path(), '-encoders'], stderr=subprocess.DEVNULL,
+                                               timeout=SUBPROCESS_TIMEOUT).decode('utf-8')
+        pattern = '(?P<type>[VASFXBD.]{6})\s+(?P<name>\S{2,})\s+(?P<description>.*)'
+        encoders = [m.groupdict() for m in re.finditer(pattern, encoders_raw)]
+        return encoders
+
+    @classmethod
+    def get_all_formats(cls):
+        formats_raw = subprocess.check_output([cls.renderer_path(), '-formats'], stderr=subprocess.DEVNULL,
+                                              timeout=SUBPROCESS_TIMEOUT).decode('utf-8')
+        pattern = '(?P<type>[DE]{1,2})\s+(?P<name>\S{2,})\s+(?P<description>.*)'
+        formats = [m.groupdict() for m in re.finditer(pattern, formats_raw)]
+        return formats
+
+    @classmethod
+    def get_output_formats(cls):
+        return [x for x in cls.get_all_formats() if 'E' in x['type'].upper()]