Configurable ffmpeg (#13722)

* Install multiple ffmpeg versions and add config to make it configurable

* Update docs

* Run ffprobe too

* Cleanup

* Apply config to go2rtc as well

* Fix ffmpeg bin

* Docs

* Restore path

* Cleanup env var

* Fix ffmpeg path for encoding

* Fix export

* Formatting

frigate/api/app.py

@@ -414,7 +414,7 @@ def ffprobe():
     output = []
 
     for path in paths:
-        ffprobe = ffprobe_stream(path.strip())
+        ffprobe = ffprobe_stream(current_app.frigate_config.ffmpeg, path.strip())
         output.append(
             {
                 "return_code": ffprobe.returncode,