libobs: Store system timestamp DTS on packets

libobs/obs-encoder.c

@@ -809,6 +809,7 @@ static inline void do_encode(struct obs_encoder *encoder,
 		 * you do not want to use relative timestamps here */
 		pkt.dts_usec = encoder->start_ts / 1000 +
 			packet_dts_usec(&pkt) - encoder->offset_usec;
+		pkt.sys_dts_usec = pkt.dts_usec;
 
 		pthread_mutex_lock(&encoder->callbacks_mutex);
 

libobs/obs-encoder.h

@@ -58,6 +58,9 @@ struct encoder_packet {
 	/* DTS in microseconds */
 	int64_t               dts_usec;
 
+	/* System DTS in microseconds */
+	int64_t               sys_dts_usec;
+
 	/**
 	 * Packet priority
 	 *