if ( t == 0
&& st->codec_info_nb_frames>30
&& st->internal->info->fps_first_dts != AV_NOPTS_VALUE
- && st->internal->info->fps_last_dts != AV_NOPTS_VALUE)
- t = FFMAX(t, av_rescale_q(st->internal->info->fps_last_dts - st->internal->info->fps_first_dts, st->time_base, AV_TIME_BASE_Q));
+ && st->internal->info->fps_last_dts != AV_NOPTS_VALUE) {
+ int64_t dur = av_sat_sub64(st->internal->info->fps_last_dts, st->internal->info->fps_first_dts);
+ t = FFMAX(t, av_rescale_q(dur, st->time_base, AV_TIME_BASE_Q));
+ }
if (analyzed_all_streams) limit = max_analyze_duration;
else if (avctx->codec_type == AVMEDIA_TYPE_SUBTITLE) limit = max_subtitle_analyze_duration;