Disable hw acceletion.

@@ -189,6 +189,7 @@
     _livePush = [TXLivePush new];
     [_livePush setLogLevel:LOGLEVEL_ERROR];
     TXLivePushConfig *config = [[TXLivePushConfig alloc] init];
+    config.enableHWAcceleration = NO;
     [_livePush setConfig:config];
     _livePush.delegate = self;
     [_livePush startPreview:self.view];
@@ -1254,6 +1255,7 @@
     _accellerateButton = [UIButton buttonWithType:UIButtonTypeCustom];
     [_accellerateButton addTarget:self action:@selector(accelleratePressed:) forControlEvents:UIControlEventTouchUpInside];
     [_accellerateButton setTitle:@"加速" forState:UIControlStateNormal];
+    _accellerateButton.enabled = NO;
     [bottomToolView addSubview:_accellerateButton];
     _logButton = [UIButton buttonWithType:UIButtonTypeCustom];
     [_logButton addTarget:self action:@selector(logPressed:) forControlEvents:UIControlEventTouchUpInside];