Support main+sub stream exports (#24193)

* Support multi resolution exports

* Fix decoder text

* Add dropdown and ability to select export stream selection

* Fix for review comments

* Fix mypy

* Cleanup wording

frigate/jobs/export.py

@@ -18,7 +18,11 @@ from frigate.config.camera.record import ChaptersEnum
 from frigate.const import UPDATE_JOB_STATE
 from frigate.jobs.job import Job
 from frigate.models import Export
-from frigate.record.export import PlaybackSourceEnum, RecordingExporter
+from frigate.record.export import (
+    ExportStreamEnum,
+    PlaybackSourceEnum,
+    RecordingExporter,
+)
 from frigate.types import JobStatusTypesEnum
 
 logger = logging.getLogger(__name__)
@@ -58,6 +62,7 @@ class ExportJob(Job):
     ffmpeg_output_args: str | None = None
     cpu_fallback: bool = False
     chapters: ChaptersEnum | None = None
+    stream: ExportStreamEnum = ExportStreamEnum.auto
     current_step: str = "queued"
     progress_percent: float = 0.0
 
@@ -347,6 +352,7 @@ class ExportJobManager:
             job.ffmpeg_output_args,
             job.cpu_fallback,
             job.chapters,
+            job.stream,
             on_progress=self._make_progress_callback(job),
         )