FS-7869: [mod_conference] fix deadlock on shutdown after playing video file that…

FS-7869: [mod_conference] fix deadlock on shutdown after playing video file that will not display video

conf/testing/autoload_configs/conference.conf.xml

@@ -270,7 +270,7 @@
       <param name="muted-sound" value="conference/conf-muted.wav"/>
       <param name="unmuted-sound" value="conference/conf-unmuted.wav"/>
       <param name="alone-sound" value="conference/conf-alone.wav"/>
-      <!--<param name="moh-sound" value="local_stream://video"/> -->
+      <param name="moh-sound" value="local_stream://video"/>
       <param name="enter-sound" value="tone_stream://%(200,0,500,600,700)"/>
       <param name="exit-sound" value="tone_stream://%(500,0,300,200,100,50,25)"/>
       <param name="kicked-sound" value="conference/conf-kicked.wav"/>

src/mod/applications/mod_conference/conference_video.c

@@ -1525,6 +1525,13 @@ void conference_video_fnode_check(conference_file_node_t *fnode) {
 			canvas->conference->playing_video_file = 1;
 		} else {
 			conference_video_canvas_set_fnode_layer(canvas, fnode, -1);
+
+			if (fnode->layer_id == -1) {
+				switch_frame_t file_frame = { 0 };
+
+				switch_core_file_read_video(&fnode->fh, &file_frame, SVR_FLUSH);
+				switch_img_free(&file_frame.img);
+			}
 		}
 	}
 }
@@ -2231,7 +2238,6 @@ void *SWITCH_THREAD_FUNC conference_video_muxing_thread_run(switch_thread_t *thr
 			switch_mutex_unlock(conference->member_mutex);
 		} else {
 
-
 			if (conference->async_fnode && conference->async_fnode->canvas_id == canvas->canvas_id) {
 				if (conference->async_fnode->layer_id > -1) {
 					conference_video_patch_fnode(canvas, conference->async_fnode);