frame #0: 0x000000010078f4f2 ffserver_g`avcodec_parameters_from_context [inlined] codec_parameters_reset(par=0x0000000000000000) + 23 at utils.c:4023 [opt]
   4020	    if (par && par->extradata) {
   4021	      av_freep(&par->extradata);
   4022	    }
-> 4023	    par->extradata = NULL;
   4024
   4025	    memset(par, 0, sizeof(*par));
   4026
(lldb) bt
* thread #1: tid = 0xb0f580, 0x000000010078f4f2 ffserver_g`avcodec_parameters_from_context [inlined] codec_parameters_reset(par=0x0000000000000000) + 23 at utils.c:4023, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x10)
  * frame #0: 0x000000010078f4f2 ffserver_g`avcodec_parameters_from_context [inlined] codec_parameters_reset(par=0x0000000000000000) + 23 at utils.c:4023 [opt]
    frame #1: 0x000000010078f4db ffserver_g`avcodec_parameters_from_context(par=0x0000000000000000, codec=0x0000000103803800) + 11 at utils.c:4083 [opt]
    frame #2: 0x0000000100016349 ffserver_g`prepare_sdp_description(stream=<unavailable>, pbuffer=<unavailable>, my_ip=(s_addr = 0)) + 473 at ffserver.c:2999 [opt]
    frame #3: 0x0000000100014cb9 ffserver_g`handle_connection + 558 at ffserver.c:1688 [opt]
    frame #4: 0x0000000100014a8b ffserver_g`handle_connection(c=<unavailable>) + 17739 at ffserver.c:1006 [opt]
    frame #5: 0x000000010000faec ffserver_g`main [inlined] http_server + 47 at ffserver.c:777 [opt]
    frame #6: 0x000000010000fabd ffserver_g`main(argc=<unavailable>, argv=<unavailable>) + 4205 at ffserver.c:4032 [opt]
    frame #7: 0x00007fff912855ad libdyld.dylib`start + 1