struct ogg *ogg = s->priv_data;
struct ogg_stream *os = ogg->streams + idx;
- uint64_t pts = (granule >> 32);
+ int invcnt = !((granule >> 30) & 3);
+ // If page granule is that of an invisible vp8 frame, its pts will be
+ // that of the end of the next visible frame. We substract 1 for those
+ // to prevent messing up pts calculations.
+ uint64_t pts = (granule >> 32) - invcnt;
uint32_t dist = (granule >> 3) & 0x07ffffff;
if (!dist)