const int64_t fsize = avio_size(s->pb);
avio_seek(s->pb, fsize - 4, SEEK_SET);
size = avio_rb32(s->pb);
- // Seek to the start of the last FLV tag at position (fsize - 4 - size)
- // but skip the byte indicating the type.
- avio_seek(s->pb, fsize - 3 - size, SEEK_SET);
- if (size == avio_rb24(s->pb) + 11) {
- uint32_t ts = avio_rb24(s->pb);
- ts |= avio_r8(s->pb) << 24;
- s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
+ if (size > 0 && size < fsize) {
+ // Seek to the start of the last FLV tag at position (fsize - 4 - size)
+ // but skip the byte indicating the type.
+ avio_seek(s->pb, fsize - 3 - size, SEEK_SET);
+ if (size == avio_rb24(s->pb) + 11) {
+ uint32_t ts = avio_rb24(s->pb);
+ ts |= avio_r8(s->pb) << 24;
+ s->duration = ts * (int64_t)AV_TIME_BASE / 1000;
+ }
}
avio_seek(s->pb, pos, SEEK_SET);
flv->searched_for_end = 1;