ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
// av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
- if(ts < best_ts){
+ if(ts < best_ts && st->nb_index_entries){
best_ts= ts;
best_st= st;
best_stream_index= i;