diff --git a/libavformat/movenc-test.c b/libavformat/movenc-test.c
index a549854fc1..0a1384e281 100644
--- a/libavformat/movenc-test.c
+++ b/libavformat/movenc-test.c
@@ -280,6 +280,23 @@ static void skip_gops(int n)
     skip_write = 0;
 }
 
+static void signal_init_ts(void)
+{
+    AVPacket pkt;
+    av_init_packet(&pkt);
+    pkt.size = 0;
+    pkt.data = NULL;
+
+    pkt.stream_index = 0;
+    pkt.dts = video_dts;
+    pkt.pts = 0;
+    av_write_frame(ctx, &pkt);
+
+    pkt.stream_index = 1;
+    pkt.dts = pkt.pts = audio_dts;
+    av_write_frame(ctx, &pkt);
+}
+
 static void finish(void)
 {
     av_write_trailer(ctx);
@@ -572,6 +589,40 @@ int main(int argc, char **argv)
     finish();
 
 
+    // Test discontinously written fragments with b-frames and audio preroll,
+    // properly signaled.
+    av_dict_set(&opts, "movflags", "frag_custom+delay_moov+dash", 0);
+    init(1, 1);
+    mux_gops(1);
+    init_out("delay-moov-elst-signal-init");
+    av_write_frame(ctx, NULL); // Output the moov
+    close_out();
+    memcpy(header, hash, HASH_SIZE);
+    av_write_frame(ctx, NULL); // Output the first fragment
+    init_out("delay-moov-elst-signal-second-frag");
+    mux_gops(1);
+    av_write_frame(ctx, NULL); // Output the second fragment
+    close_out();
+    memcpy(content, hash, HASH_SIZE);
+    finish();
+
+    av_dict_set(&opts, "movflags", "frag_custom+delay_moov+dash+frag_discont", 0);
+    av_dict_set(&opts, "fragment_index", "2", 0);
+    init(1, 1);
+    signal_init_ts();
+    skip_gops(1);
+    mux_gops(1); // Write the second fragment
+    init_out("delay-moov-elst-signal-init-discont");
+    av_write_frame(ctx, NULL); // Output the moov
+    close_out();
+    check(!memcmp(hash, header, HASH_SIZE), "discontinuously written header differs");
+    init_out("delay-moov-elst-signal-second-frag-discont");
+    av_write_frame(ctx, NULL); // Output the second fragment
+    close_out();
+    check(!memcmp(hash, content, HASH_SIZE), "discontinuously written fragment differs");
+    finish();
+
+
     // Test VFR content, with sidx atoms (which declare the pts duration
     // of a fragment, forcing overriding the start pts of the next one).
     // Here, the fragment duration in pts is significantly different from
diff --git a/tests/ref/fate/movenc b/tests/ref/fate/movenc
index fec7db5952..b1196a20bd 100644
--- a/tests/ref/fate/movenc
+++ b/tests/ref/fate/movenc
@@ -20,5 +20,9 @@ f12baf7c4269695817337192c7069328 996 delay-moov-content
 41afdc44b0e376fae49a730afe0c53c2 704 delay-moov-elst-second-frag
 93d5d944d10570857b726dd1c482bc03 1207 delay-moov-elst-init-discont
 41afdc44b0e376fae49a730afe0c53c2 704 delay-moov-elst-second-frag-discont
+bf648056bf98cf98b0fbd1334d788423 1243 delay-moov-elst-signal-init
+13b8487a4f004ec9f1db543aee1e5e18 704 delay-moov-elst-signal-second-frag
+bf648056bf98cf98b0fbd1334d788423 1243 delay-moov-elst-signal-init-discont
+13b8487a4f004ec9f1db543aee1e5e18 704 delay-moov-elst-signal-second-frag-discont
 4407220c69fb6d96fd3f4daea05140c3 3647 vfr
 4407220c69fb6d96fd3f4daea05140c3 3647 vfr-noduration