The dtshd file format written by the DTS-HD Master Suite has some metadata that instructs the decoder to cut off a few frames at the beginning. dcadec probably respects that while others do not. This isn't really the case for any other DTS-HD stream, as a stream extracted from a Blu-ray, for example, would never have such metadata.
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LAV Filters - open source ffmpeg based media splitter and decoders
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