MxlOutputFlow.mediaType property

Media type: determines format conversion (v210 for video, float32 for audio). "ancillary" and "subtitle" pins both write a video/smpte291 MXL data flow — subscribe SCTE-35 streams to an "ancillary" pin and teletext / CTA-708 / CTA-608 subtitle streams to a "subtitle" pin (they are separate pin kinds because each pin accepts one payload type).

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