MT#55283 duplicate cache PTs into cache arena

Closes #2074

Change-Id: I62946675c5b6c4367ca884dcf346a0f6f6c712a7
(cherry picked from commit ce02900)

Author: rfuchs

daemon/media_player.c

@@ -913,6 +913,12 @@ static bool media_player_cache_entry_init(struct media_player *mp, const rtp_pay
 
 	entry->coder.handler->packet_encoded = media_player_packet_cache;
 
+	call_memory_arena_release();
+	memory_arena = &entry->arena;
+	codec_init_payload_type(&entry->coder.handler->source_pt, MT_UNKNOWN);
+	codec_init_payload_type(&entry->coder.handler->dest_pt, MT_UNKNOWN);
+	call_memory_arena_set(mp->call);
+
 	// use low priority (10 nice)
 	thread_create_detach_prio(media_player_cache_entry_decoder_thread, obj_get(entry), NULL, 10, "mp decoder");