if (duration > 0) {
/* we do not know encoder delay until we get the first packet from
* libvorbis, so we have to update the AudioFrameQueue counts */
- if (!avctx->delay) {
+ if (!avctx->delay && s->afq.frames) {
avctx->delay = duration;
av_assert0(!s->afq.remaining_delay);
s->afq.frames->duration += duration;