Write a low resolution low fps stream from decoded frames (#8673)

* Generate low res low fps previews for recordings viewer

* Make sure previews end on the hour

* Fix durations and decrase keyframe interval to ensure smooth scrubbing

* Ensure minimized resolution is compatible with yuv

* Add ability to configure preview quality

* Fix

* Clean up previews more efficiently

* Use iterator

frigate/config.py

@@ -260,6 +260,20 @@ class RecordExportConfig(FrigateBaseModel):
     )
 
 
+class RecordQualityEnum(str, Enum):
+    very_low = "very_low"
+    low = "low"
+    medium = "medium"
+    high = "high"
+    very_high = "very_high"
+
+
+class RecordPreviewConfig(FrigateBaseModel):
+    quality: RecordQualityEnum = Field(
+        default=RecordQualityEnum.medium, title="Quality of recording preview."
+    )
+
+
 class RecordConfig(FrigateBaseModel):
     enabled: bool = Field(default=False, title="Enable record on all cameras.")
     sync_recordings: bool = Field(
@@ -278,6 +292,9 @@ class RecordConfig(FrigateBaseModel):
     export: RecordExportConfig = Field(
         default_factory=RecordExportConfig, title="Recording Export Config"
     )
+    preview: RecordPreviewConfig = Field(
+        default_factory=RecordPreviewConfig, title="Recording Preview Config"
+    )
     enabled_in_config: Optional[bool] = Field(
         title="Keep track of original state of recording."
     )