20260429_232813-fix: video frame display pipeline — default project seed, presigned URLs, Canvas/FrameTimeline real frames, upload-parse flow

backend/routers/media.py

@@ -71,6 +71,24 @@ async def upload_media(
             logger.info("Linked upload to project_id=%s", project_id)
         else:
             logger.warning("Project id=%s not found for upload linkage", project_id)
+    else:
+        # Auto-create a project named after the file
+        project = Project(
+            name=file.filename,
+            description="Auto-created from upload",
+            status="pending",
+            video_path=object_name,
+        )
+        db.add(project)
+        db.commit()
+        db.refresh(project)
+        project_id = project.id
+        object_name = f"uploads/{project_id}/{file.filename}"
+        # Re-upload with corrected path
+        upload_file(object_name, data, content_type=file.content_type or "application/octet-stream", length=len(data))
+        project.video_path = object_name
+        db.commit()
+        logger.info("Auto-created project id=%s for upload %s", project_id, file.filename)
 
     # TODO: enqueue async parsing job (Celery / background task)
     logger.info("Upload complete: %s (size=%d bytes). Async parsing queued.", object_name, len(data))
@@ -79,6 +97,7 @@ async def upload_media(
         "object_name": object_name,
         "file_url": file_url,
         "size": len(data),
+        "project_id": project_id,
         "message": "Upload successful. Parsing job queued.",
     }