for (j = 0; j < nb_input_files; j++) {
for (i = 0; i < input_files[j]->nb_streams; i++) {
AVCodecContext *c = input_files[j]->ctx->streams[i]->codec;
- if (c->codec_type != AVMEDIA_TYPE_VIDEO)
+ if (c->codec_type != AVMEDIA_TYPE_VIDEO ||
+ !c->time_base.num)
continue;
fr = c->time_base.den * 1000 / c->time_base.num;
if (fr == 25000) {