--- main/translate.c	(Asterisk 13.5.0)
+++ main/translate.c	(working copy)
@@ -306,5 +306,5 @@
  * and possibly desc.
  */
-static struct ast_trans_pvt *newpvt(struct ast_translator *t)
+static struct ast_trans_pvt *newpvt(struct ast_translator *t, struct ast_format *format)
 {
 	struct ast_trans_pvt *pvt;
@@ -332,4 +332,5 @@
 		pvt->outbuf.c = ofs + AST_FRIENDLY_OFFSET;
 	}
+	pvt->f.subclass.format = ao2_bump(format);
 
 	ast_module_ref(t->module);
@@ -484,5 +485,10 @@
 			return NULL;
 		}
-		if (!(cur = newpvt(t))) {
+		if ((t->dst_codec.sample_rate != ast_format_get_sample_rate(dst)) || (strcmp(t->dst_codec.name, ast_format_get_name(dst)))) {
+			cur = newpvt(t, NULL);
+		} else {
+			cur = newpvt(t, dst);
+		}
+		if (!cur) {
 			ast_log(LOG_WARNING, "Failed to build translator step from %s to %s\n",
 				ast_format_get_name(src), ast_format_get_name(dst));
@@ -622,5 +628,5 @@
 	}
 
-	pvt = newpvt(t);
+	pvt = newpvt(t, NULL);
 	if (!pvt) {
 		ast_log(LOG_WARNING, "Translator '%s' appears to be broken and will probably fail.\n", t->name);