fftools/ffmpeg: Disable copy_ts on timestamp wraparound

This allows handling more than 26.5h of mpeg* input

Fixes: Ticket 7876
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

fftools/ffmpeg.c

@@ -4263,6 +4263,7 @@ static int process_input(int file_index)
     int ret, thread_ret, i, j;
     int64_t duration;
     int64_t pkt_dts;
+    int disable_discontinuity_correction = copy_ts;
 
     is  = ifile->ctx;
     ret = get_input_packet(ifile, &pkt);
@@ -4464,10 +4465,20 @@ static int process_input(int file_index)
         pkt.dts += duration;
 
     pkt_dts = av_rescale_q_rnd(pkt.dts, ist->st->time_base, AV_TIME_BASE_Q, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
+
+    if (copy_ts && pkt_dts != AV_NOPTS_VALUE && ist->next_dts != AV_NOPTS_VALUE &&
+        (is->iformat->flags & AVFMT_TS_DISCONT) && ist->st->pts_wrap_bits < 60) {
+        int64_t wrap_dts = av_rescale_q_rnd(pkt.dts + (1LL<<ist->st->pts_wrap_bits),
+                                            ist->st->time_base, AV_TIME_BASE_Q,
+                                            AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
+        if (FFABS(wrap_dts - ist->next_dts) < FFABS(pkt_dts - ist->next_dts)/10)
+            disable_discontinuity_correction = 0;
+    }
+
     if ((ist->dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO ||
          ist->dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) &&
          pkt_dts != AV_NOPTS_VALUE && ist->next_dts != AV_NOPTS_VALUE &&
-        !copy_ts) {
+        !disable_discontinuity_correction) {
         int64_t delta   = pkt_dts - ist->next_dts;
         if (is->iformat->flags & AVFMT_TS_DISCONT) {
             if (delta < -1LL*dts_delta_threshold*AV_TIME_BASE ||