Add CLI args for setting video codec and pixel forma

manimlib/config.py

@@ -93,6 +93,14 @@ def parse_cli():
             action="store_true",
             help="Render to a movie file with an alpha channel",
         )
+        parser.add_argument(
+            "--vcodec",
+            help="Video codec to use with ffmpeg",
+        )
+        parser.add_argument(
+            "--pix_fmt",
+            help="Pixel format to use for the output of ffmpeg, defaults to `yuv420p`",
+        )
         parser.add_argument(
             "-q", "--quiet",
             action="store_true",
@@ -392,7 +400,7 @@ def get_output_directory(args: Namespace, custom_config: dict) -> str:
 
 
 def get_file_writer_config(args: Namespace, custom_config: dict) -> dict:
-    return {
+    result = {
         "write_to_movie": not args.skip_animations and args.write_file,
         "break_into_partial_movies": custom_config["break_into_partial_movies"],
         "save_last_frame": args.skip_animations and args.write_file,
@@ -408,6 +416,18 @@ def get_file_writer_config(args: Namespace, custom_config: dict) -> dict:
         "quiet": args.quiet,
     }
 
+    if args.vcodec:
+        result["video_codec"] = args.vcodec
+    elif args.transparent:
+        result["video_codec"] = 'prores_ks'
+    elif args.gif:
+        result["video_codec"] = ''
+
+    if args.pix_fmt:
+        result["pix_fmt"] = args.pix_fmt
+
+    return result
+
 
 def get_window_config(args: Namespace, custom_config: dict, camera_config: dict) -> dict:
     # Default to making window half the screen size

manimlib/scene/scene_file_writer.py

@@ -47,6 +47,8 @@ def __init__(
         quiet: bool = False,
         total_frames: int = 0,
         progress_description_len: int = 40,
+        video_codec: str = "libx264",
+        pixel_format: str = "yuvj422p",
     ):
         self.scene: Scene = scene
         self.write_to_movie = write_to_movie
@@ -63,6 +65,8 @@ def __init__(
         self.quiet = quiet
         self.total_frames = total_frames
         self.progress_description_len = progress_description_len
+        self.video_codec = video_codec
+        self.pixel_format = pixel_format
 
         # State during file writing
         self.writing_process: sp.Popen | None = None
@@ -262,19 +266,10 @@ def open_movie_pipe(self, file_path: str) -> None:
             '-an',  # Tells FFMPEG not to expect any audio
             '-loglevel', 'error',
         ]
-        if self.movie_file_extension == ".mov":
-            # This is if the background of the exported
-            # video should be transparent.
-            command += [
-                '-vcodec', 'prores_ks',
-            ]
-        elif self.movie_file_extension == ".gif":
-            command += []
-        else:
-            command += [
-                '-vcodec', 'libx264',
-                '-pix_fmt', 'yuv420p',
-            ]
+        if self.video_codec:
+            command += ['-vcodec', self.video_codec]
+        if self.pixel_format:
+            command += ['-pix_fmt', self.pixel_format]
         command += [self.temp_file_path]
         self.writing_process = sp.Popen(command, stdin=sp.PIPE)
 
@@ -287,6 +282,10 @@ def open_movie_pipe(self, file_path: str) -> None:
             )
             self.set_progress_display_description()
 
+    def use_fast_encoding(self):
+        self.video_codec = "libx264rgb"
+        self.pixel_format = "rgb32"
+
     def begin_insert(self):
         # Begin writing process
         self.write_to_movie = True