# Command Line Launch Options

Multiview for NDI supports the following command line options.

{% hint style="info" %}
These are subject to change. We'll do our best to indicate if/when a command line parameter will be deprecated or removed.
{% endhint %}

### "--blittype": Scaling mode override

Sets the upscale/downscale mode in the engine. By default, the engine uses a linear filter for quality.

Accepted options:

* `--blittype=fastest`:  nearest neighbor scaling. Will be blocky, but is the fastest.
* `--blittype=pgpt` : Use linear interpolation. This uses parallel processing to speed up rendering.
* `--blittype=best`: Use linear interpolation. Equivalent to `pgpt`.
* `--blittype=pgpt2`: Use an experimental linear blitter that uses AVX2. Do not use.

### "--eemsec": Caption evaluation time override

Sets the wait time (in milliseconds) for caption expression evaluation. Defaults to 250 milliseconds (4 updates/second). 

{% hint style="info" %}
Since an update to an expression can cause captions to be re-rendered, we suggest keeping this number fairly high. 250 milliseconds tends to strike a good balance between reactivity and performance.
{% endhint %}

In the example below, expressions for captions will be re-evaluated every 500 milliseconds.

```
./Tractus.Multiview.Ndi.SWEngine --eemsec=500

```