Export preview via api (#14535)

* Break out recording to separate function

* Implement preview exporting

* Formatting

frigate/api/export.py

@@ -13,8 +13,12 @@ from peewee import DoesNotExist
 
 from frigate.api.defs.tags import Tags
 from frigate.const import EXPORT_DIR
-from frigate.models import Export, Recordings
-from frigate.record.export import PlaybackFactorEnum, RecordingExporter
+from frigate.models import Export, Previews, Recordings
+from frigate.record.export import (
+    PlaybackFactorEnum,
+    PlaybackSourceEnum,
+    RecordingExporter,
+)
 
 logger = logging.getLogger(__name__)
 
@@ -45,6 +49,7 @@ def export_recording(
 
     json: dict[str, any] = body or {}
     playback_factor = json.get("playback", "realtime")
+    playback_source = json.get("source", "recordings")
     friendly_name: Optional[str] = json.get("name")
 
     if len(friendly_name or "") > 256:
@@ -55,12 +60,16 @@ def export_recording(
 
     existing_image = json.get("image_path")
 
+    if playback_source == "recordings":
         recordings_count = (
             Recordings.select()
             .where(
                 Recordings.start_time.between(start_time, end_time)
                 | Recordings.end_time.between(start_time, end_time)
-            | ((start_time > Recordings.start_time) & (end_time < Recordings.end_time))
+                | (
+                    (start_time > Recordings.start_time)
+                    & (end_time < Recordings.end_time)
+                )
             )
             .where(Recordings.camera == camera_name)
             .count()
@@ -73,6 +82,25 @@ def export_recording(
                 ),
                 status_code=400,
             )
+    else:
+        previews_count = (
+            Previews.select()
+            .where(
+                Previews.start_time.between(start_time, end_time)
+                | Previews.end_time.between(start_time, end_time)
+                | ((start_time > Previews.start_time) & (end_time < Previews.end_time))
+            )
+            .where(Previews.camera == camera_name)
+            .count()
+        )
+
+        if previews_count <= 0:
+            return JSONResponse(
+                content=(
+                    {"success": False, "message": "No previews found for time range"}
+                ),
+                status_code=400,
+            )
 
     export_id = f"{camera_name}_{''.join(random.choices(string.ascii_lowercase + string.digits, k=6))}"
     exporter = RecordingExporter(
@@ -88,6 +116,11 @@ def export_recording(
             if playback_factor in PlaybackFactorEnum.__members__.values()
             else PlaybackFactorEnum.realtime
         ),
+        (
+            PlaybackSourceEnum[playback_source]
+            if playback_source in PlaybackSourceEnum.__members__.values()
+            else PlaybackSourceEnum.recordings
+        ),
     )
     exporter.start()
     return JSONResponse(

frigate/record/export.py

@@ -43,6 +43,11 @@ class PlaybackFactorEnum(str, Enum):
     timelapse_25x = "timelapse_25x"
 
 
+class PlaybackSourceEnum(str, Enum):
+    recordings = "recordings"
+    preview = "preview"
+
+
 class RecordingExporter(threading.Thread):
     """Exports a specific set of recordings for a camera to storage as a single file."""
 
@@ -56,6 +61,7 @@ class RecordingExporter(threading.Thread):
         start_time: int,
         end_time: int,
         playback_factor: PlaybackFactorEnum,
+        playback_source: PlaybackSourceEnum,
     ) -> None:
         super().__init__()
         self.config = config
@@ -66,6 +72,7 @@ class RecordingExporter(threading.Thread):
         self.start_time = start_time
         self.end_time = end_time
         self.playback_factor = playback_factor
+        self.playback_source = playback_source
 
         # ensure export thumb dir
         Path(os.path.join(CLIPS_DIR, "export")).mkdir(exist_ok=True)
@@ -170,30 +177,7 @@ class RecordingExporter(threading.Thread):
 
         return thumb_path
 
-    def run(self) -> None:
-        logger.debug(
-            f"Beginning export for {self.camera} from {self.start_time} to {self.end_time}"
-        )
-        export_name = (
-            self.user_provided_name
-            or f"{self.camera.replace('_', ' ')} {self.get_datetime_from_timestamp(self.start_time)} {self.get_datetime_from_timestamp(self.end_time)}"
-        )
-        video_path = f"{EXPORT_DIR}/{self.export_id}.mp4"
-
-        thumb_path = self.save_thumbnail(self.export_id)
-
-        Export.insert(
-            {
-                Export.id: self.export_id,
-                Export.camera: self.camera,
-                Export.name: export_name,
-                Export.date: self.start_time,
-                Export.video_path: video_path,
-                Export.thumb_path: thumb_path,
-                Export.in_progress: True,
-            }
-        ).execute()
-
+    def get_record_export_command(self, video_path: str) -> list[str]:
         if (self.end_time - self.start_time) <= MAX_PLAYLIST_SECONDS:
             playlist_lines = f"http://127.0.0.1:5000/vod/{self.camera}/start/{self.start_time}/end/{self.end_time}/index.m3u8"
             ffmpeg_input = (
@@ -204,7 +188,10 @@ class RecordingExporter(threading.Thread):
 
             # get full set of recordings
             export_recordings = (
-                Recordings.select()
+                Recordings.select(
+                    Recordings.start_time,
+                    Recordings.end_time,
+                )
                 .where(
                     Recordings.start_time.between(self.start_time, self.end_time)
                     | Recordings.end_time.between(self.start_time, self.end_time)
@@ -229,6 +216,65 @@ class RecordingExporter(threading.Thread):
 
             ffmpeg_input = "-y -protocol_whitelist pipe,file,http,tcp -f concat -safe 0 -i /dev/stdin"
 
+        if self.playback_factor == PlaybackFactorEnum.realtime:
+            ffmpeg_cmd = (
+                f"{self.config.ffmpeg.ffmpeg_path} -hide_banner {ffmpeg_input} -c copy -movflags +faststart {video_path}"
+            ).split(" ")
+        elif self.playback_factor == PlaybackFactorEnum.timelapse_25x:
+            ffmpeg_cmd = (
+                parse_preset_hardware_acceleration_encode(
+                    self.config.ffmpeg.ffmpeg_path,
+                    self.config.ffmpeg.hwaccel_args,
+                    f"-an {ffmpeg_input}",
+                    f"{self.config.cameras[self.camera].record.export.timelapse_args} -movflags +faststart {video_path}",
+                    EncodeTypeEnum.timelapse,
+                )
+            ).split(" ")
+
+        return ffmpeg_cmd, playlist_lines
+
+    def get_preview_export_command(self, video_path: str) -> list[str]:
+        playlist_lines = []
+
+        # get full set of previews
+        export_previews = (
+            Previews.select(
+                Previews.path,
+                Previews.start_time,
+                Previews.end_time,
+            )
+            .where(
+                Previews.start_time.between(self.start_time, self.end_time)
+                | Previews.end_time.between(self.start_time, self.end_time)
+                | (
+                    (self.start_time > Previews.start_time)
+                    & (self.end_time < Previews.end_time)
+                )
+            )
+            .where(Previews.camera == self.camera)
+            .order_by(Previews.start_time.asc())
+            .namedtuples()
+            .iterator()
+        )
+
+        preview: Previews
+        for preview in export_previews:
+            playlist_lines.append(f"file '{preview.path}'")
+
+            if preview.start_time < self.start_time:
+                playlist_lines.append(
+                    f"inpoint {int(self.start_time - preview.start_time)}"
+                )
+
+            if preview.end_time > self.end_time:
+                playlist_lines.append(
+                    f"outpoint {int(preview.end_time - self.end_time)}"
+                )
+
+        ffmpeg_input = (
+            "-y -protocol_whitelist pipe,file,tcp -f concat -safe 0 -i /dev/stdin"
+        )
+
         if self.playback_factor == PlaybackFactorEnum.realtime:
             ffmpeg_cmd = (
                 f"{self.config.ffmpeg.ffmpeg_path} -hide_banner {ffmpeg_input} -c copy -movflags +faststart {video_path}"
@@ -244,6 +290,36 @@ class RecordingExporter(threading.Thread):
                 )
             ).split(" ")
 
+        return ffmpeg_cmd, playlist_lines
+
+    def run(self) -> None:
+        logger.debug(
+            f"Beginning export for {self.camera} from {self.start_time} to {self.end_time}"
+        )
+        export_name = (
+            self.user_provided_name
+            or f"{self.camera.replace('_', ' ')} {self.get_datetime_from_timestamp(self.start_time)} {self.get_datetime_from_timestamp(self.end_time)}"
+        )
+        video_path = f"{EXPORT_DIR}/{self.export_id}.mp4"
+        thumb_path = self.save_thumbnail(self.export_id)
+
+        Export.insert(
+            {
+                Export.id: self.export_id,
+                Export.camera: self.camera,
+                Export.name: export_name,
+                Export.date: self.start_time,
+                Export.video_path: video_path,
+                Export.thumb_path: thumb_path,
+                Export.in_progress: True,
+            }
+        ).execute()
+
+        if self.playback_source == PlaybackSourceEnum.recordings:
+            ffmpeg_cmd, playlist_lines = self.get_record_export_command(video_path)
+        else:
+            ffmpeg_cmd, playlist_lines = self.get_preview_export_command(video_path)
+
         p = sp.run(
             ffmpeg_cmd,
             input="\n".join(playlist_lines),
@@ -254,7 +330,7 @@ class RecordingExporter(threading.Thread):
 
         if p.returncode != 0:
             logger.error(
-                f"Failed to export recording for command {' '.join(ffmpeg_cmd)}"
+                f"Failed to export {self.playback_source.value} for command {' '.join(ffmpeg_cmd)}"
             )
             logger.error(p.stderr)
             Path(video_path).unlink(missing_ok=True)