+
+ // at minimum one bit per macroblock is required at least in a valid frame,
+ // we discard frames much smaller than this. Frames smaller than 1/8 of the
+ // smallest "black/skip" frame generally contain not much recoverable content
+ // while at the same time they have the highest computational requirements
+ // per byte
+ if (get_bits_left(&s->gb) * 8LL < (s->width+15)/16 * ((s->height+15)/16))
+ return AVERROR_INVALIDDATA;