ffserver.c:4093: error: Uninitialized Value
  The value read from video_enc.flags was never initialized.

ffserver.c:4093:17: 
4091.             get_arg(arg, sizeof(arg), &p);
4092.             if (stream) {
4093.                 video_enc.flags |= CODEC_FLAG_QSCALE;
                      ^
4094.                 video_enc.global_quality = FF_QP2LAMBDA * atoi(arg);
4095.             }
