FS-9106 followup and tweaks on this patch after some testing

src/mod/applications/mod_conference/conference_video.c

@@ -1480,7 +1480,7 @@ void conference_video_launch_muxing_write_thread(conference_member_t *member)
 	switch_mutex_lock(conference_globals.hash_mutex);
 	if (!member->video_muxing_write_thread) {
 		switch_threadattr_create(&thd_attr, member->pool);
-		switch_threadattr_priority_set(thd_attr, SWITCH_PRI_REALTIME);
+		//switch_threadattr_priority_set(thd_attr, SWITCH_PRI_REALTIME);
 		switch_threadattr_stacksize_set(thd_attr, SWITCH_THREAD_STACKSIZE);
 		switch_thread_create(&member->video_muxing_write_thread, thd_attr, conference_video_muxing_write_thread_run, member, member->pool);
 	}
@@ -1493,7 +1493,7 @@ void conference_video_launch_muxing_thread(conference_obj_t *conference, mcu_can
 	switch_mutex_lock(conference_globals.hash_mutex);
 	if (!canvas->video_muxing_thread) {
 		switch_threadattr_create(&thd_attr, conference->pool);
-		switch_threadattr_priority_set(thd_attr, SWITCH_PRI_REALTIME);
+		//switch_threadattr_priority_set(thd_attr, SWITCH_PRI_REALTIME);
 		switch_threadattr_stacksize_set(thd_attr, SWITCH_THREAD_STACKSIZE);
 		conference_utils_set_flag(conference, CFLAG_VIDEO_MUXING);
 		switch_thread_create(&canvas->video_muxing_thread, thd_attr,

src/switch_vpx.c

@@ -360,7 +360,7 @@ static switch_status_t init_encoder(switch_codec_t *codec)
 	vpx_codec_enc_cfg_t *config = &context->config;
 	int token_parts = 1;
 	int cpus = switch_core_cpu_count();
-	int sane;
+	int sane, threads = 1;
 	
 	if (!context->codec_settings.video.width) {
 		context->codec_settings.video.width = 1280;
@@ -404,7 +404,9 @@ static switch_status_t init_encoder(switch_codec_t *codec)
 	config->rc_target_bitrate = context->bandwidth;
 	config->g_lag_in_frames = 0;
 	config->kf_max_dist = 360;//2000;
-	config->g_threads = cpus - 1;//(cpus > 1) ? 2 : 1;
+	threads = cpus / 4;
+	if (threads < 0) threads = 1;
+	config->g_threads = threads;
 	
 	if (context->is_vp9) {
 		//config->rc_dropframe_thresh = 2;