diff --git a/src/gst/gstpipewireformat.c b/src/gst/gstpipewireformat.c
index 110226a05..006c49906 100644
--- a/src/gst/gstpipewireformat.c
+++ b/src/gst/gstpipewireformat.c
@@ -59,6 +59,8 @@ static const struct media_type media_type_map[] = {
   { "video/x-h264", SPA_MEDIA_TYPE_video, SPA_MEDIA_SUBTYPE_h264 },
   { "audio/x-mulaw", SPA_MEDIA_TYPE_audio, SPA_MEDIA_SUBTYPE_raw },
   { "audio/x-alaw", SPA_MEDIA_TYPE_audio, SPA_MEDIA_SUBTYPE_raw },
+  { "audio/mpeg", SPA_MEDIA_TYPE_audio, SPA_MEDIA_SUBTYPE_mp3 },
+  { "audio/x-flac", SPA_MEDIA_TYPE_audio, SPA_MEDIA_SUBTYPE_flac },
   { NULL, }
 };
 
@@ -532,6 +534,12 @@ handle_audio_fields (ConvertData *d)
   } else if (strcmp(d->type->name, "audio/x-alaw") == 0) {
         spa_pod_builder_prop (&d->b, SPA_FORMAT_AUDIO_format, 0);
         spa_pod_builder_id (&d->b, SPA_AUDIO_FORMAT_ALAW);
+  } else if (strcmp(d->type->name, "audio/mpeg") == 0) {
+        spa_pod_builder_prop (&d->b, SPA_FORMAT_AUDIO_format, 0);
+        spa_pod_builder_id (&d->b, SPA_AUDIO_FORMAT_ENCODED);
+  } else if (strcmp(d->type->name, "audio/x-flac") == 0) {
+        spa_pod_builder_prop (&d->b, SPA_FORMAT_AUDIO_format, 0);
+        spa_pod_builder_id (&d->b, SPA_AUDIO_FORMAT_ENCODED);
   }
 
 #if 0
diff --git a/src/gst/gstpipewiresink.c b/src/gst/gstpipewiresink.c
index 9e07e09d7..91bdfcc74 100644
--- a/src/gst/gstpipewiresink.c
+++ b/src/gst/gstpipewiresink.c
@@ -346,6 +346,14 @@ gst_pipewire_sink_sink_fixate (GstBaseSink * bsink, GstCaps * caps)
     gst_structure_fixate_field_string (structure, "format", "S16LE");
     gst_structure_fixate_field_nearest_int (structure, "channels", 2);
     gst_structure_fixate_field_nearest_int (structure, "rate", 44100);
+  } else if (gst_structure_has_name (structure, "audio/mpeg")) {
+    gst_structure_fixate_field_string (structure, "format", "Encoded");
+    gst_structure_fixate_field_nearest_int (structure, "channels", 2);
+    gst_structure_fixate_field_nearest_int (structure, "rate", 44100);
+  } else if (gst_structure_has_name (structure, "audio/x-flac")) {
+    gst_structure_fixate_field_string (structure, "format", "Encoded");
+    gst_structure_fixate_field_nearest_int (structure, "channels", 2);
+    gst_structure_fixate_field_nearest_int (structure, "rate", 44100);
   }
 
   caps = GST_BASE_SINK_CLASS (parent_class)->fixate (bsink, caps);