zerocodec: check if the previous frame is missing
ZeroCodec relies on the keyframe flag being set in the container, and prev is the previously decoded frame. A keyframe flags incorrectly set will lead to this condition. Signed-off-by: NPaul B Mahol <onemda@gmail.com> Signed-off-by: NLuca Barbato <lu_zero@gentoo.org>
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