Records every codec in the given mimeType as denylisted. Returns true if any
codec was newly added (i.e. was not already denylisted), false if all codecs
were already present. The return value lets callers bound retry loops: a
repeat failure for an already-denylisted codec should not trigger another
fallback attempt.
Records every codec in the given mimeType as denylisted. Returns true if any codec was newly added (i.e. was not already denylisted), false if all codecs were already present. The return value lets callers bound retry loops: a repeat failure for an already-denylisted codec should not trigger another fallback attempt.