ffmpeg: make timestamp discontinuity logging a warning

In most cases this should only occur once or so per stream in an
input, and in case the logic ends up in an eternal loop, it should
be visible to the end user instead of being completely invisible.

Signed-off-by: Jan Ekström <jan.ekstrom@24i.com>

fftools/ffmpeg.c

@@ -2512,7 +2512,7 @@ static void ts_discontinuity_detect(InputFile *ifile, InputStream *ist,
             if (FFABS(delta) > 1LL * dts_delta_threshold * AV_TIME_BASE ||
                 pkt_dts + AV_TIME_BASE/10 < FFMAX(ist->pts, ist->dts)) {
                 ifile->ts_offset_discont -= delta;
-                av_log(NULL, AV_LOG_DEBUG,
+                av_log(NULL, AV_LOG_WARNING,
                        "timestamp discontinuity for stream #%d:%d "
                        "(id=%d, type=%s): %"PRId64", new offset= %"PRId64"\n",
                        ist->file_index, ist->st->index, ist->st->id,