Rework audio encoding for restream (#5092)

* Use memo for recordings timezone

* Add audio encoding field and simplify stream creation

* Update docs and tests

* Fix bad logic

docs/docs/configuration/index.md

@@ -356,8 +356,12 @@ rtmp:
 restream:
   # Optional: Enable the restream (default: True)
   enabled: True
-  # Optional: Force audio compatibility with browsers (default: shown below)
+  # Optional: Set the audio codecs to restream with
-  force_audio: True
+  # possible values are aac, copy, opus. Set to copy
+  # only to avoid transcoding (default: shown below)
+  audio_encoding:
+    - aac
+    - opus
   # Optional: Video encoding to be used. By default the codec will be copied but
   # it can be switched to another or an MJPEG stream can be encoded and restreamed
   # as h264 (default: shown below)

docs/docs/configuration/restream.md

@@ -7,9 +7,9 @@ title: Restream
 
 Frigate can restream your video feed as an RTSP feed for other applications such as Home Assistant to utilize it at `rtsp://<frigate_host>:8554/<camera_name>`. Port 8554 must be open. [This allows you to use a video feed for detection in Frigate and Home Assistant live view at the same time without having to make two separate connections to the camera](#reduce-connections-to-camera). The video feed is copied from the original video feed directly to avoid re-encoding. This feed does not include any annotation by Frigate.
 
-#### Force Audio
+#### Copy Audio
 
-Different live view technologies (ex: MSE, WebRTC) support different audio codecs. The `restream -> force_audio` flag tells the restream to make multiple streams available so that all live view technologies are supported. Some camera streams don't work well with this, in which case `restream -> force_audio` should be disabled.
+Different live view technologies (ex: MSE, WebRTC) support different audio codecs. The `restream -> audio_encoding` field tells the restream to make multiple streams available so that all live view technologies are supported. Some camera streams don't work well with this, in which case `restream -> audio_encoding` should be set to `copy` only.
 
 #### Birdseye Restream
 

frigate/config.py

@@ -524,16 +524,26 @@ class JsmpegStreamConfig(FrigateBaseModel):
     quality: int = Field(default=8, ge=1, le=31, title="Live camera view quality.")
 
 
-class RestreamCodecEnum(str, Enum):
+class RestreamVideoCodecEnum(str, Enum):
     copy = "copy"
     h264 = "h264"
     h265 = "h265"
 
 
+class RestreamAudioCodecEnum(str, Enum):
+    aac = "aac"
+    copy = "copy"
+    opus = "opus"
+
+
 class RestreamConfig(FrigateBaseModel):
     enabled: bool = Field(default=True, title="Restreaming enabled.")
-    video_encoding: RestreamCodecEnum = Field(
+    audio_encoding: list[RestreamAudioCodecEnum] = Field(
-        default=RestreamCodecEnum.copy, title="Method for encoding the restream."
+        default=[RestreamAudioCodecEnum.aac, RestreamAudioCodecEnum.opus],
+        title="Codecs to supply for audio.",
+    )
+    video_encoding: RestreamVideoCodecEnum = Field(
+        default=RestreamVideoCodecEnum.copy, title="Method for encoding the restream."
     )
     force_audio: bool = Field(
         default=True, title="Force audio compatibility with the browser."

frigate/restream.py

@@ -6,7 +6,7 @@ import requests
 
 from typing import Optional
 
-from frigate.config import FrigateConfig, RestreamCodecEnum
+from frigate.config import FrigateConfig, RestreamAudioCodecEnum, RestreamVideoCodecEnum
 from frigate.const import BIRDSEYE_PIPE
 from frigate.ffmpeg_presets import (
     parse_preset_hardware_acceleration_encode,
@@ -18,18 +18,26 @@ logger = logging.getLogger(__name__)
 
 
 def get_manual_go2rtc_stream(
-    camera_url: str, codec: RestreamCodecEnum, engine: Optional[str]
+    camera_url: str,
+    aCodecs: list[RestreamAudioCodecEnum],
+    vCodec: RestreamVideoCodecEnum,
+    engine: Optional[str],
 ) -> str:
     """Get a manual stream for go2rtc."""
-    if codec == RestreamCodecEnum.copy:
+    stream = f"ffmpeg:{camera_url}"
-        return f"ffmpeg:{camera_url}#video=copy#audio=aac#audio=opus"
+
+    for aCodec in aCodecs:
+        stream += f"#audio={aCodec}"
+
+    if vCodec == RestreamVideoCodecEnum.copy:
+        stream += "#video=copy"
+    else:
+        stream += f"#video={vCodec}"
 
         if engine:
-        return (
+            stream += f"#hardware={engine}"
-            f"ffmpeg:{camera_url}#video={codec}#hardware={engine}#audio=aac#audio=opus"
-        )
 
-    return f"ffmpeg:{camera_url}#video={codec}#audio=aac#audio=opus"
+    return stream
 
 
 class RestreamApi:
@@ -50,7 +58,10 @@ class RestreamApi:
                 if "restream" in input.roles:
                     if (
                         input.path.startswith("rtsp")
-                        and not camera.restream.force_audio
+                        and camera.restream.video_encoding
+                        == RestreamVideoCodecEnum.copy
+                        and camera.restream.audio_encoding
+                        == [RestreamAudioCodecEnum.copy]
                     ):
                         self.relays[
                             cam_name
@@ -59,6 +70,7 @@ class RestreamApi:
                         # go2rtc only supports rtsp for direct relay, otherwise ffmpeg is used
                         self.relays[cam_name] = get_manual_go2rtc_stream(
                             escape_special_characters(input.path),
+                            camera.restream.audio_encoding,
                             camera.restream.video_encoding,
                             parse_preset_hardware_acceleration_go2rtc_engine(
                                 self.config.ffmpeg.hwaccel_args

frigate/test/test_restream.py

@@ -25,7 +25,7 @@ class TestRestream(TestCase):
                     },
                     "restream": {
                         "enabled": True,
-                        "force_audio": False,
+                        "audio_encoding": ["copy"],
                     },
                 },
                 "front": {