No subject

The granule (PCM) position of the first page need not indicate that the stream
started at position zero. Although the granule position belongs to the last
completed packet on the page and a valid granule position must be positive, by
inference it may indicate that the PCM position of the beginning of audio is
positive or negative.

    * A positive starting value simply indicates that this stream begins at
some positive time offset, potentially within a larger program. This is a
common case when connecting to the middle of broadcast stream.
    * A negative value indicates that output samples preceeding time zero
should be discarded during decoding; this technique is used to allow
sample-granularity editing of the stream start time of already-encoded Vorbis
streams. The number of samples to be discarded must not exceed the overlap-add
span of the first two audio packets.

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