According vMix ( here are below the technical/System Requirements for using SRT:

  • Windows 10 x64 or higher
  • Graphics card with support for HEVC and H264 encoding and decoding.
    NVIDIA Quadro P2000 or higher series recommended.
    NOTE: NVIDIA GeForce 9xx series or lower should not be used with SRT, and is unsupported.
  • When using HEVC on Windows 10, the "HEVC Video Extensions" from the Microsoft Store is required to be installed.
  • Progressive video formats are supported only. (interlaced support is not available)
  • vMix supports HEVC or H264 video and AAC audio (AAC-LC) wrapped in a transport stream only. Other codecs are not supported.