Update go2rtc, simplify manual stream, and support audio for MSE & WebRTC (#4391)

* Update go2rtc to rc3

* Simplify ffmpeg / audio conversions

* Set ffmpeg bin location

* Manually set video as copied

* Run go2rtc with env vars

* Remove manual ffmpeg declaration

* Enable force_audio by default

* Fix test

docker/Dockerfile

@@ -119,7 +119,7 @@ RUN --mount=type=bind,from=wheels,source=/wheels,target=/wheels \
 ENV PATH=$PATH:/usr/lib/btbn-ffmpeg/bin
 
 # install go2rtc
-RUN wget -O go2rtc "https://github.com/AlexxIT/go2rtc/releases/download/v0.1-rc.2/go2rtc_linux_${TARGETARCH}" \
+RUN wget -O go2rtc "https://github.com/AlexxIT/go2rtc/releases/download/v0.1-rc.3/go2rtc_linux_${TARGETARCH}" \
     && chmod +x go2rtc \
     && mkdir -p /usr/local/go2rtc/sbin/ \
     && mv go2rtc /usr/local/go2rtc/sbin/go2rtc

docker/rootfs/etc/services.d/go2rtc/run

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/with-contenv bash
 
 # https://gist.github.com/mohanpedala/1e2ff5661761d3abd0385e8223e16425?permalink_comment_id=3945021
 set -euo pipefail

docs/docs/configuration/index.md

@@ -354,7 +354,7 @@ restream:
   # Optional: Enable the restream (default: True)
   enabled: True
   # Optional: Force audio compatibility with browsers (default: shown below)
-  force_audio: False
+  force_audio: True
   # Optional: jsmpeg stream configuration for WebUI
   jsmpeg:
     # Optional: Set the height of the jsmpeg stream. (default: 720)

frigate/config.py

@@ -536,7 +536,7 @@ class JsmpegStreamConfig(FrigateBaseModel):
 class RestreamConfig(FrigateBaseModel):
     enabled: bool = Field(default=True, title="Restreaming enabled.")
     force_audio: bool = Field(
-        default=False, title="Force audio compatibility with the browser."
+        default=True, title="Force audio compatibility with the browser."
     )
     jsmpeg: JsmpegStreamConfig = Field(
         default_factory=JsmpegStreamConfig, title="Jsmpeg Stream Configuration."

frigate/restream.py

@@ -12,7 +12,7 @@ logger = logging.getLogger(__name__)
 
 def get_manual_go2rtc_stream(camera_url: str) -> str:
     """Get a manual stream for go2rtc."""
-    return f"exec: /usr/lib/btbn-ffmpeg/bin/ffmpeg -i {camera_url} -c:v copy -c:a libopus -rtsp_transport tcp -f rtsp {{output}}"
+    return f"ffmpeg:{camera_url}#video=copy#audio=aac#audio=opus"
 
 
 class RestreamApi:

frigate/test/test_restream.py

@@ -25,6 +25,7 @@ class TestRestream(TestCase):
                     },
                     "restream": {
                         "enabled": True,
+                        "force_audio": False,
                     },
                 },
                 "front": {