diff --git a/meshroom/nodes/aliceVision/LdrToHdrCalibration.py b/meshroom/nodes/aliceVision/LdrToHdrCalibration.py
index ef5a6c55..5093d4fd 100644
--- a/meshroom/nodes/aliceVision/LdrToHdrCalibration.py
+++ b/meshroom/nodes/aliceVision/LdrToHdrCalibration.py
@@ -69,6 +69,7 @@ Calibrate LDR to HDR response curve from samples.
             value=0,
             range=(0, 10, 1),
             uid=[0],
+            group="bracketsParams"
         ),
         desc.BoolParam(
             name="byPass",
@@ -163,6 +164,12 @@ Calibrate LDR to HDR response curve from samples.
     def processChunk(self, chunk):
         if chunk.node.nbBrackets.value == 1:
             return
+        # Trick to avoid sending --nbBrackets to the command line when the bracket detection is automatic.
+        # Otherwise, the AliceVision executable has no way of determining whether the bracket detection was automatic
+        # or if it was hard-set by the user.
+        self.commandLine = "aliceVision_LdrToHdrCalibration {allParams}"
+        if chunk.node.userNbBrackets.value == chunk.node.nbBrackets.value:
+            self.commandLine += "{bracketsParams}"
         super(LdrToHdrCalibration, self).processChunk(chunk)
 
     @classmethod
diff --git a/meshroom/nodes/aliceVision/LdrToHdrMerge.py b/meshroom/nodes/aliceVision/LdrToHdrMerge.py
index b86d46b9..1cae31c6 100644
--- a/meshroom/nodes/aliceVision/LdrToHdrMerge.py
+++ b/meshroom/nodes/aliceVision/LdrToHdrMerge.py
@@ -68,6 +68,7 @@ Merge LDR images into HDR images.
             value=0,
             range=(0, 10, 1),
             uid=[0],
+            group="bracketsParams"
         ),
         desc.BoolParam(
             name="offsetRefBracketIndexEnabled",
@@ -358,3 +359,12 @@ Merge LDR images into HDR images.
                     node.nbBrackets.value = bestBracketSize
                 else:
                     node.nbBrackets.value = 0
+
+    def processChunk(self, chunk):
+        # Trick to avoid sending --nbBrackets to the command line when the bracket detection is automatic.
+        # Otherwise, the AliceVision executable has no way of determining whether the bracket detection was automatic
+        # or if it was hard-set by the user.
+        self.commandLine = "aliceVision_LdrToHdrMerge {allParams}"
+        if chunk.node.userNbBrackets.value == chunk.node.nbBrackets.value:
+            self.commandLine += "{bracketsParams}"
+        super(LdrToHdrMerge, self).processChunk(chunk)
diff --git a/meshroom/nodes/aliceVision/LdrToHdrSampling.py b/meshroom/nodes/aliceVision/LdrToHdrSampling.py
index 443e93a9..fb62a6ef 100644
--- a/meshroom/nodes/aliceVision/LdrToHdrSampling.py
+++ b/meshroom/nodes/aliceVision/LdrToHdrSampling.py
@@ -79,6 +79,7 @@ Sample pixels from Low range images for HDR creation.
             value=0,
             range=(0, 10, 1),
             uid=[0],
+            group="bracketsParams"
         ),
         desc.BoolParam(
             name="byPass",
@@ -184,6 +185,12 @@ Sample pixels from Low range images for HDR creation.
     def processChunk(self, chunk):
         if chunk.node.nbBrackets.value == 1:
             return
+        # Trick to avoid sending --nbBrackets to the command line when the bracket detection is automatic.
+        # Otherwise, the AliceVision executable has no way of determining whether the bracket detection was automatic
+        # or if it was hard-set by the user.
+        self.commandLine = "aliceVision_LdrToHdrSampling {allParams}"
+        if chunk.node.userNbBrackets.value == chunk.node.nbBrackets.value:
+            self.commandLine += "{bracketsParams}"
         super(LdrToHdrSampling, self).processChunk(chunk)
 
     @classmethod