Initial Commit of FFMPEG settings.

processor.py

@@ -18,6 +18,7 @@
 import ffmpeg
 import srt
 from PIL import ImageFont, ImageDraw, Image
+import yaml
 
 
 class CountsPerSec:
@@ -387,6 +388,37 @@ def to_numpy(im):
             raise RuntimeError("encoder error %d in tobytes" % s)
         return data
 
+    @staticmethod
+    def load_encoder_defaults_yaml(encoder_name_string: str) -> dict:
+        """
+        Loads an encoder settings yaml with some 'nice' presets that should
+        work. Modifying encoder_settings.yaml allows tuning of ffmpeg parameters
+        for the output video.
+        :param: enco
+        """
+        default_encoder_settings = {
+            'crf': 0,
+            'b:v': '40M',
+            'preset': 'fast'
+        }
+        fname = 'encoder_settings.yaml'
+        if not os.path.isfile(fname):
+            folder, _ = os.path.split(__file__)
+            fname = f"{folder}/resources/encoder_settings.yaml"
+
+        try:
+            with open(fname, 'r') as fp:
+                settings = yaml.load(fp.read(), yaml.SafeLoader)
+        except FileNotFoundError:
+            logging.warning("No encoder_settings.yaml found, using defaults")
+            return default_encoder_settings
+        try:
+            return settings[encoder_name_string]
+        except KeyError:
+            logging.warning(f'No encoder settings found for '
+                            f'{encoder_name_string}, using defaults')
+            return default_encoder_settings
+
 
 class OsdPreview:
 
@@ -613,13 +645,13 @@ def render(self):
             .filter("scale", **ff_size, force_original_aspect_ratio=1, )
         )
         encoder_name = self.get_working_encoder()
+        encoder_settings = Utils.load_encoder_defaults_yaml(encoder_name)
         output_args = {
             "c:v": encoder_name,
-            "preset": "fast",
-            "crf": 0,
-            "b:v": "40M",
-            "acodec": "copy"
         }
+        for pair in encoder_settings:
+            output_args[pair['key']] = pair['value']
+        output_args['acodec'] = 'copy'
         self.render_done = False
         process = (
             video

resources/encoder_settings.yaml

@@ -0,0 +1,19 @@
+h264_videotoolbox:
+  - key: 'q:v'
+    value: '65'
+
+h265_videotoolbox:
+  - key: 'q:v'
+    value: '65'
+
+libx264:
+  - key: 'crf'
+    value: '23'
+  - key: 'preset'
+    value: 'medium'
+
+libx265:
+  - key: 'crf'
+    value: '23'
+  - key: 'preset'
+    value: 'medium'