fix func of FfmpegLoad for unexpected file format

雾聪

2023-10-12 00e038e22009a2014ba52f315045d875e96c93a7

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add_library(csrc STATIC
        feature-fbank.cc
        feature-functions.cc
        feature-window.cc
        fftsg.c
        mel-computations.cc
        online-feature.cc
        rfft.cc)