h264: fix decoding multiple fields per packet with slice threads
Since we only know whether a NAL unit corresponds to a new field after parsing the slice header, this requires reorganizing the calls to slice parsing, per-slice/field/frame init and actual decoding. In the previous code, the function for slice header decoding also immediately started a new field/frame as necessary, so any slices already queued for decoding would no longer be decodable. After this patch, we first parse the slice header, and if we determine that a new field needs to be started we decode all the queued slices.
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