From bbba5e81d5212e88bf64a14e3dd80155c8e56c60 Mon Sep 17 00:00:00 2001
From: ofTheo <theo@openframeworks.cc>
Date: Sat, 19 Apr 2025 14:44:33 -0700
Subject: [PATCH 1/2] added static function to set preferred subtype for
 Directshow capture / Windows

---
 libs/openFrameworks/video/ofDirectShowGrabber.cpp | 11 +++++++++++
 libs/openFrameworks/video/ofDirectShowGrabber.h   | 11 ++++++++---
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/libs/openFrameworks/video/ofDirectShowGrabber.cpp b/libs/openFrameworks/video/ofDirectShowGrabber.cpp
index a29428d8604..e135bd83df6 100644
--- a/libs/openFrameworks/video/ofDirectShowGrabber.cpp
+++ b/libs/openFrameworks/video/ofDirectShowGrabber.cpp
@@ -1,6 +1,17 @@
 #include "ofDirectShowGrabber.h"
 #include "ofUtils.h"
 #ifdef TARGET_WIN32
+
+//--------------------------------------------------------------------
+//Static members / functions 
+
+int ofDirectShowGrabber::preferredFormat = -1; 
+
+void ofDirectShowGrabber::setPreferredFormat(int aPreferredFormat) {
+	preferredFormat = aPreferredFormat;
+}
+
+
 //--------------------------------------------------------------------
 ofDirectShowGrabber::ofDirectShowGrabber(){
 
diff --git a/libs/openFrameworks/video/ofDirectShowGrabber.h b/libs/openFrameworks/video/ofDirectShowGrabber.h
index 96545e48dcb..bacdbc21b5f 100644
--- a/libs/openFrameworks/video/ofDirectShowGrabber.h
+++ b/libs/openFrameworks/video/ofDirectShowGrabber.h
@@ -32,6 +32,13 @@ class ofDirectShowGrabber : public ofBaseVideoGrabber{
 		ofDirectShowGrabber();
 		virtual ~ofDirectShowGrabber();
 
+		/// \brief Sets the preffered DirectShow media subtype - MJPG / H264 can provide faster framerates 
+		///
+		/// /use formats like: MEDIASUBTYPE_H264, MEDIASUBTYPE_MJPG, MEDIASUBTYPE_Y800 etc, default is: MEDIASUBTYPE_RGB24
+		/// /use -1 to revert to the default behavior 
+		///
+		static void setPreferredFormat(int aPreferredFormat); 		
+
 		std::vector<ofVideoDevice>	listDevices() const;
 		bool					setup(int w, int h);
 		void					update();
@@ -56,9 +63,6 @@ class ofDirectShowGrabber : public ofBaseVideoGrabber{
 		void					setDeviceID(int _deviceID);
 		void					setDesiredFrameRate(int framerate);
 
-
-		
-
 	protected:
 	
 		bool					bChooseDevice;
@@ -70,6 +74,7 @@ class ofDirectShowGrabber : public ofBaseVideoGrabber{
 		bool 					bIsFrameNew;	
 		
 		int						width, height;	
+		static int				preferredFormat; 
 		//--------------------------------- directshow
 		#ifdef OF_VIDEO_CAPTURE_DIRECTSHOW
 			int 					device;

From 48354aebefb554635c814e69878cec8db8ab34ec Mon Sep 17 00:00:00 2001
From: ofTheo <theo@openframeworks.cc>
Date: Sat, 19 Apr 2025 14:47:32 -0700
Subject: [PATCH 2/2] missing implementation

---
 libs/openFrameworks/video/ofDirectShowGrabber.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libs/openFrameworks/video/ofDirectShowGrabber.cpp b/libs/openFrameworks/video/ofDirectShowGrabber.cpp
index e135bd83df6..39f4e486a2a 100644
--- a/libs/openFrameworks/video/ofDirectShowGrabber.cpp
+++ b/libs/openFrameworks/video/ofDirectShowGrabber.cpp
@@ -62,6 +62,9 @@ bool ofDirectShowGrabber::setup(int w, int h){
 		height = h;
 		bGrabberInited = false;
 
+		if (preferredFormat >= 0) {
+			VI.setRequestedMediaSubType(preferredFormat);
+		}
 		if( attemptFramerate >= 0){
 			VI.setIdealFramerate(device, attemptFramerate);
 		}