FS-7513: conf WIP hard code 4x4 squares in 720p more to come

src/switch_core_media.c

@@ -1515,7 +1515,7 @@ SWITCH_DECLARE(switch_status_t) switch_media_handle_create(switch_media_handle_t
 		session->media_handle->mparams = params;
 		
 		if (!session->media_handle->mparams->video_key_freq) {
-			session->media_handle->mparams->video_key_freq = 30000000;
+			session->media_handle->mparams->video_key_freq = 5000000;
 		}
 
 		if (!session->media_handle->mparams->video_key_first) {

src/switch_core_video.c

@@ -68,9 +68,8 @@ SWITCH_DECLARE(void) switch_img_free(switch_image_t **img)
 {
 	if (img && *img) {
 		vpx_img_free((vpx_image_t *)*img);
+		*img = NULL;
 	}
-
-	*img = NULL;
 }
 
 SWITCH_DECLARE(void) switch_img_copy(switch_image_t *img, switch_image_t **new_img)