Merge commit 'cce99f72d1b49d3dfee859136eeff3db32553750' into release/2.4
* commit 'cce99f72d1b49d3dfee859136eeff3db32553750':
mpegenc: prevent a NULL pointer dereference
See: 010adacbe2
Merged-by: Michael Niedermayer <michaelni@gmx.at>
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