Merge commit 'a9f108bd78e842a47ade2f7c8b22a1764d01d4e6' into release/2.4
* commit 'a9f108bd78e842a47ade2f7c8b22a1764d01d4e6':
ac3_parser: add required padding for GetBitContext buffer
See: fccd85b9f3
Merged-by: Michael Niedermayer <michael@niedermayer.cc>
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