50 fields interlaced makes 25 frames per second, thats how all PAL interlaced streams look. There is no real way to know without visual inspection of the footage. 1080i50 could be interlaced, or it could be fake-interlaced. The number alone tells you nothing.
Also, you gave no context that its even from a Blu-ray. But even then, those can also contain true interlaced streams.
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LAV Filters - open source ffmpeg based media splitter and decoders
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