diff --git a/src/descrambler/emm_reass.c b/src/descrambler/emm_reass.c
index 8f66edc..91b40d4 100644
--- a/src/descrambler/emm_reass.c
+++ b/src/descrambler/emm_reass.c
@@ -91,14 +91,20 @@ emm_irdeto
   emm_provider_t *ep;
   char prov[4];
 
-  if (len < 4)
+  if (len < 4) {
+    tvhtrace(ra->subsys, "if (%d < 4) return",len);
     return;
+  }
 
   emm_mode = data[3] >> 3;
   emm_len = data[3] & 0x07;
 
-  if (4 + emm_len > len || emm_len > 3)
+  tvhtrace(ra->subsys, "EMM_IRDETO len:%d emm_mode:%d emm_len:%d", len, emm_mode, emm_len);
+
+  if (4 + emm_len > len || emm_len > 3) {
+    tvhtrace(ra->subsys, "if (%d > %d || %d > %d) return", 4 + emm_len, len, emm_len, 3);
     return;
+  }
 
   if (emm_mode & 0x10) {
     // try to match card
@@ -123,8 +129,8 @@ emm_irdeto
       }
     }
   }
-
-  if (match)
+  tvhtrace(ra->subsys, "match=%d send(len=%d)",match, len);
+  if (match==0)
     send(aux, data, len, mux);
 }
 
@@ -604,6 +610,7 @@ emm_filter(emm_reass_t *ra, const uint8_t *data, int len, void *mux,
   tvhtrace(ra->subsys, "emm filter : %s - len %d mux %p", caid2name(ra->caid), len, mux);
   tvhlog_hexdump(ra->subsys, data, len);
   if (ra->do_emm)
+    tvhtrace(ra->subsys, "do_emm: %d", ra->type);
     ra->do_emm(ra, data, len, mux, send, aux);
 }