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That applies to AnnexB streams. If the stream is instead packaged in a container format like MKV then you can use the container's format to find the other slices.
Note that by doing parallelism with slice you are not being as efficent as possible. Each slice means you have to repeat the slider header again, wasting bits. Also, prediction is broken across slice boundaries resulting in compression efficiency loss. WPP addresses this. Tiles break prediction too, but at least don't have the repeated header overhead.
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