How do I use software coding when I don't have a graphics card/no graphics driver? Do FEC parameters have an effect on audio?

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I can't use Sunshine streaming when I uninstall the graphics card driver or use a computer without a graphics card, can I use software encoding for streaming at this time?
Does the FEC parameter only have an effect on video, does audio get FEC added to it? If it is added, will it be affected by the FEC parameter?