diff --git a/trap/video_sources.py b/trap/video_sources.py
index 37ad555..ef7e0b6 100644
--- a/trap/video_sources.py
+++ b/trap/video_sources.py
@@ -124,7 +124,10 @@ class SingleCvVideoSource(VideoSource):
 
 class RtspSource(SingleCvVideoSource):
     def __init__(self, video_url: str | Path, camera: Camera = None):
-        gst = f"rtspsrc location={video_url} latency=0 buffer-mode=auto ! decodebin ! videoconvert ! appsink max-buffers=0 drop=true"
+        # keep max 1 frame in app-buffer (0 = unlimited)
+        # When using gstreamer 1.28 drop=true is deprecated, use: leaky-type=2 which frame to drop: https://gstreamer.freedesktop.org/documentation/applib/gstappsrc.html?gi-language=c
+        
+        gst = f"rtspsrc location={video_url} latency=0 buffer-mode=auto ! decodebin ! videoconvert ! appsink max-buffers=1  drop=true"
         logger.info(f"Capture gstreamer (gst-launch-1.0): {gst}")
         self.video = cv2.VideoCapture(gst, cv2.CAP_GSTREAMER)
         self.frame_idx = 0
@@ -209,7 +212,7 @@ class CameraSource(SingleCvVideoSource):
         self.video.set(cv2.CAP_PROP_FPS, self.camera.fps)
         self.frame_idx = 0
  
-def get_video_source(video_sources: List[UrlOrPath], camera: Camera, frame_offset=0, frame_end:Optional[int]=None, loop=False):
+def get_video_source(video_sources: List[UrlOrPath], camera: Optional[Camera] = None, frame_offset=0, frame_end:Optional[int]=None, loop=False):
     
     if str(video_sources[0]).isdigit():
         # numeric input is a CV camera
@@ -230,3 +233,7 @@ def get_video_source(video_sources: List[UrlOrPath], camera: Camera, frame_offse
         return FilelistSource(video_sources, offset = frame_offset, end=frame_end, loop=loop)
         # os.environ["OPENCV_FFMPEG_CAPTURE_OPTIONS"] = "fflags;nobuffer|flags;low_delay|avioflags;direct|rtsp_transport;udp"
         
+
+def get_video_source_from_str(video_sources: List[str]):
+    paths = [UrlOrPath(s) for s in video_sources]
+    return get_video_source(paths)
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