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[non-BE] Resolve "Counter overflow in ISM metadata encoder"

vaclav requested to merge 1273-counter-overflow-in-ivas-metadata-encoder into main

Reason why this change is needed

  • Counter overflow can happen in the ISM metadata encoder.

Description of the change

  • Limitation of the counter's highest value and reset of the counter are introduced. Consequently, metadata are coded absolutely at least once per 25 inactive frames.

Affected operating points

  • Non-BE in rare cases in long segments of inactive content in one out of several objects. Differences are subjectively important (verified on a long self-test vector).
  • Bitstream is compatible.
Edited by vaclav

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