Add API and WebUI to export recordings (#6550)

* Add ability to export frigate clips

* Add http endpoint

* Add dir to nginx

* Add webUI

* Formatting

* Cleanup unused

* Optimize timelapse

* Fix pts

* Use JSON body for params

* Use hwaccel to encode when available

* Print ffmpeg command when fail

* Print ffmpeg command when fail

* Add separate ffmpeg preset for timelapse

* Add docs outlining the export directory

* Add export docs

* Use ''

* Fix playlist max time

* Lower max playlist time

* Add api docs for export

* isort fixes

frigate/app.py

@@ -24,6 +24,7 @@ from frigate.const import (
     CLIPS_DIR,
     CONFIG_DIR,
     DEFAULT_DB_PATH,
+    EXPORT_DIR,
     MODEL_CACHE_DIR,
     RECORD_DIR,
 )
@@ -68,7 +69,14 @@ class FrigateApp:
             os.environ[key] = value
 
     def ensure_dirs(self) -> None:
-        for d in [CONFIG_DIR, RECORD_DIR, CLIPS_DIR, CACHE_DIR, MODEL_CACHE_DIR]:
+        for d in [
+            CONFIG_DIR,
+            RECORD_DIR,
+            CLIPS_DIR,
+            CACHE_DIR,
+            MODEL_CACHE_DIR,
+            EXPORT_DIR,
+        ]:
             if not os.path.exists(d) and not os.path.islink(d):
                 logger.info(f"Creating directory: {d}")
                 os.makedirs(d)