Check ffmpeg version instead of checking for presence of BTBN_PATH (#7023)

* Check ffmpeg version instead of checking for presence of BTBN_PATH

* Query ffmpeg version in s6 run script instead of subprocessing in every import

* Define LIBAVFORMAT_VERSION_MAJOR in devcontainer too

* Formatting

* Default ffmpeg version to current btbn version so unit tests pass

frigate/const.py

@@ -11,7 +11,6 @@ YAML_EXT = (".yaml", ".yml")
 FRIGATE_LOCALHOST = "http://127.0.0.1:5000"
 PLUS_ENV_VAR = "PLUS_API_KEY"
 PLUS_API_HOST = "https://api.frigate.video"
-BTBN_PATH = "/usr/lib/btbn-ffmpeg"
 
 # Attributes
 

frigate/ffmpeg_presets.py

@@ -5,7 +5,6 @@ import os
 from enum import Enum
 from typing import Any
 
-from frigate.const import BTBN_PATH
 from frigate.util import vainfo_hwaccel
 from frigate.version import VERSION
 
@@ -43,7 +42,11 @@ class LibvaGpuSelector:
         return ""
 
 
-TIMEOUT_PARAM = "-timeout" if os.path.exists(BTBN_PATH) else "-stimeout"
+TIMEOUT_PARAM = (
+    "-timeout"
+    if int(os.getenv("LIBAVFORMAT_VERSION_MAJOR", "59")) >= 59
+    else "-stimeout"
+)
 
 _gpu_selector = LibvaGpuSelector()
 _user_agent_args = [