Add slices-max feature
The H.264 spec technically has limits on the number of slices per frame. x264 normally ignores this, since most use-cases that require large numbers of slices prefer it to. However, certain decoders may break with extremely large numbers of slices, as can occur with some slice-max-size/mbs settings. When set, x264 will refuse to create any slices beyond the maximum number, even if slice-max-size/mbs requires otherwise.
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