ADD Cli options to change defaults

now support changing crf, preset and original media type

src/models/streams.py

@@ -24,7 +24,9 @@ class VideoStream(BaseModel):
     avg_frame_rate: str = Field(None, alias="avg_frame_rate")
     codec_name: str = Field(None)
     disposition: Disposition
-    tags: Tags
+    tags: Tags | None = Field(None)
+    preset: int = Field(2)
+    crf: int = Field(30)
 
     @cached_property
     def fps(self) -> float:
@@ -38,9 +40,9 @@ class VideoStream(BaseModel):
             "-c:v",
             "libsvtav1",
             "-crf",
-            "30",
+            str(self.crf),
             "-preset",
-            "6",
+            str(self.preset),
             "-svtav1-params",
             "tune=0:film-grain=20:scd=1",
             "-vf",
@@ -56,7 +58,7 @@ class AudioStream(BaseModel):
     sample_fmt: str
     channel_layout: str
     disposition: Disposition
-    tags: Tags
+    tags: Tags | None = Field(None)
 
     def cmd_flags(self, index: int) -> list[str]:
         side_loaded = []
@@ -81,7 +83,7 @@ class SubtitleStream(BaseModel):
     index: int
     codec_name: str
     disposition: Disposition
-    tags: Tags
+    tags: Tags | None = Field(None)
 
     def cmd_flags(self, index: int) -> list[str]:
         return ["-map", f"0:s:{index}", f"-c:s:{index}", "copy"] + [