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It sounds like you're asking for a related to inspecting, analyzing, or working with an MP4 file that follows a specific SS (Segmented/Sample-Synchronous?) NITA naming or metadata scheme — possibly a proprietary format or internal standard.
Since “SS NITA mp4” isn't a widely known public standard, I’ll assume = Segment Synchronization or Sample Sync , and NITA = Network Integrated Timing & Alignment or an internal project name. SS NITA mp4