int len, size = avpkt->size;
while (size > 0) {
+ int duration;
ASSDialog *dialog = ff_ass_split_dialog(avctx->priv_data, ptr, 0, NULL);
- int duration = dialog->end - dialog->start;
+ if (!dialog)
+ return AVERROR_INVALIDDATA;
+ duration = dialog->end - dialog->start;
len = ff_ass_add_rect(data, ptr, 0, duration, 1);
if (len < 0)
return len;