Add option to repeat last captured frame instead of capturing new frames for the end of a timelapse. Defaults to current behavior (capturing new frames for the time after). Implements foosel/OctoPrint#1422

src/octoprint/server/api/timelapse.py

@@ -66,7 +66,8 @@ def getTimelapseData():
 		config = dict(type="timed",
 		              postRoll=timelapse.post_roll,
 		              fps=timelapse.fps,
-		              interval=timelapse.interval)
+		              interval=timelapse.interval,
+		              capturePostRoll=timelapse.capture_post_roll)
 	else:
 		config = dict(type="off")
 
@@ -204,6 +205,16 @@ def setTimelapseConfig():
 				else:
 					return make_response("Invalid value for interval: %d" % interval)
 
+		if "capturePostRoll" in data:
+			config["options"]["capturePostRoll"] = True
+			try:
+				capturePostRoll = bool(data["capturePostRoll"])
+			except ValueError:
+				return make_response("Invalid value for capturePostRoll: %r" % data["capturePostRoll"])
+			else:
+				config["options"]["capturePostRoll"] = capturePostRoll
+
+
 		if "retractionZHop" in request.values:
 			config["options"] = {
 				"retractionZHop": 0
@@ -219,6 +230,7 @@ def setTimelapseConfig():
 				else:
 					return make_response("Invalid value for retraction Z-Hop: %d" % retractionZHop)
 
+
 		if admin_permission.can() and "save" in data and data["save"] in valid_boolean_trues:
 			octoprint.timelapse.configure_timelapse(config, True)
 		else:

src/octoprint/settings.py

@@ -166,7 +166,8 @@ default_settings = {
 			"type": "off",
 			"options": {},
 			"postRoll": 0,
-			"fps": 25
+			"fps": 25,
+			"capturePostRoll": True
 		},
 		"cleanTmpAfterDays": 7
 	},

src/octoprint/static/js/app/viewmodels/timelapse.js

@@ -10,12 +10,14 @@ $(function() {
         self.defaultPostRoll = 0;
         self.defaultInterval = 10;
         self.defaultRetractionZHop = 0;
+        self.defaultCapturePostroll = true;
 
         self.timelapseType = ko.observable(undefined);
         self.timelapseTimedInterval = ko.observable(self.defaultInterval);
         self.timelapsePostRoll = ko.observable(self.defaultPostRoll);
         self.timelapseFps = ko.observable(self.defaultFps);
         self.timelapseRetractionZHop = ko.observable(self.defaultRetractionZHop);
+        self.timelapseCapturePostRoll = ko.observable(self.defaultCapturePostRoll);
 
         self.persist = ko.observable(false);
         self.isDirty = ko.observable(false);
@@ -61,6 +63,9 @@ $(function() {
         self.timelapseRetractionZHop.subscribe(function(newValue) {
             self.isDirty(true);
         });
+        self.timelapseCapturePostRoll.subscribe(function() {
+            self.isDirty(true);
+        });
 
         // initialize list helper
         self.listHelper = new ItemListHelper(
@@ -167,6 +172,12 @@ $(function() {
                 self.timelapseFps(self.defaultFps);
             }
 
+            if (config.capturePostRoll != undefined){
+                self.timelapseCapturePostRoll(config.capturePostRoll);
+            } else {
+                self.timelapseCapturePostRoll(self.defaultCapturePostRoll);
+            }
+
             self.persist(false);
             self.isDirty(false);
         };
@@ -214,6 +225,7 @@ $(function() {
 
             if (self.timelapseType() == "timed") {
                 payload["interval"] = self.timelapseTimedInterval();
+                payload["capturePostRoll"] = self.timelapseCapturePostRoll();
             }
 
             if (self.timelapseType() == "zchange") {

src/octoprint/templates/tabs/timelapse.jinja2

@@ -24,6 +24,12 @@
         <input type="text" class="input-mini" id="webcam_timelapse_postRoll" data-bind="value: timelapsePostRoll, valueUpdate: 'afterkeydown', enable: isOperational() && !isPrinting() && loginState.isUser() && timelapseTypeSelected()">
         <span class="add-on">{{ _('sec') }}</span>
     </div>
+    <div id="webcam_timelapse_timed_postRoll" data-bind="visible: timelapseType() == 'timed'">
+        <label class="checkbox">
+            <input type="checkbox" data-bind="checked: timelapseCapturePostRoll, valueUpdate: 'afterkeydown', enable: isOperational() && !isPrinting() && loginState.isUser()"> {{ _('Capture postroll images. If disabled, we will simply repeat the last frame for the post roll') }}
+        </label>
+    </div>
+    
 
     <div id="webcam_timelapse_timedsettings" data-bind="visible: intervalInputEnabled">
         <label for="webcam_timelapse_interval">{{ _('Interval') }}</label>

src/octoprint/timelapse.py

@@ -303,7 +303,10 @@ def configure_timelapse(config=None, persist=False):
 		interval = 10
 		if "options" in config and "interval" in config["options"] and config["options"]["interval"] > 0:
 			interval = config["options"]["interval"]
-		current = TimedTimelapse(post_roll=postRoll, interval=interval, fps=fps)
+		capture_post_roll = True
+		if "options" in config and "capturePostRoll" in config["options"] and isinstance(config["options"]["capturePostRoll"], bool):
+			capture_post_roll = config["options"]["capturePostRoll"]
+		current = TimedTimelapse(post_roll=postRoll, interval=interval, fps=fps, capture_post_roll=capture_post_roll)
 
 	notify_callbacks(current)
 
@@ -628,11 +631,12 @@ class ZTimelapse(Timelapse):
 
 
 class TimedTimelapse(Timelapse):
-	def __init__(self, post_roll=0, interval=1, fps=25):
+	def __init__(self, post_roll=0, interval=1, fps=25, capture_post_roll=True):
 		Timelapse.__init__(self, post_roll=post_roll, fps=fps)
 		self._interval = interval
 		if self._interval < 1:
 			self._interval = 1 # force minimum interval of 1s
+		self._capture_post_roll = capture_post_roll
 		self._postroll_captures = 0
 		self._timer = None
 		self._logger.debug("TimedTimelapse initialized")
@@ -641,11 +645,16 @@ class TimedTimelapse(Timelapse):
 	def interval(self):
 		return self._interval
 
+	@property
+	def capture_post_roll(self):
+		return self._capture_post_roll
+
 	def config_data(self):
 		return {
 			"type": "timed",
 			"options": {
-				"interval": self._interval
+				"interval": self._interval,
+				"capture_post_roll": self._capture_post_roll
 			}
 		}
 
@@ -662,14 +671,31 @@ class TimedTimelapse(Timelapse):
 		self._timer.start()
 
 	def on_print_done(self, event, payload):
-		self._postroll_captures = self._post_roll * self._fps
+		if self._capture_post_roll:
+			self._postroll_captures = self._post_roll * self._fps
 		Timelapse.on_print_done(self, event, payload)
 
 	def calculate_post_roll(self):
-		return self._post_roll * self._fps * self._interval
+		if self._capture_post_roll:
+			return self._post_roll * self._fps * self._interval
+		else:
+			return Timelapse.calculate_post_roll(self)
 
 	def process_post_roll(self):
-		pass
+		if self._capture_post_roll:
+			return
+
+		with self._capture_mutex:
+			filename = os.path.join(self._capture_dir, _capture_format.format(prefix=self._file_prefix) % self._image_number)
+			self._image_number += 1
+
+		if self._perform_capture(filename):
+			for _ in range(self._post_roll * self._fps):
+				newFile = os.path.join(self._capture_dir, _capture_format.format(prefix=self._file_prefix) % self._image_number)
+				self._image_number += 1
+				shutil.copyfile(filename, newFile)
+
+		self.post_roll_finished()
 
 	def post_roll_finished(self):
 		Timelapse.post_roll_finished(self)
@@ -684,7 +710,8 @@ class TimedTimelapse(Timelapse):
 			self._postroll_captures -= 1
 
 	def _on_timer_finished(self):
-		self.post_roll_finished()
+		if self._capture_post_roll:
+			self.post_roll_finished()
 
 
 class TimelapseRenderJob(object):