diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 1d0dbb3296..c4e0438c1d 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -2105,10 +2105,29 @@ static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
                 else
                     pkt->pts = timecode;
                 pkt->pos = pos;
-                if (st->codec->codec_id == AV_CODEC_ID_SUBRIP)
+                if (st->codec->codec_id == AV_CODEC_ID_SUBRIP) {
+                    /*
+                     * For backward compatibility.
+                     * Historically, we have put subtitle duration
+                     * in convergence_duration, on the off chance
+                     * that the time_scale is less than 1us, which
+                     * could result in a 32bit overflow on the
+                     * normal duration field.
+                     */
                     pkt->convergence_duration = lace_duration;
-                else if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE)
+                }
+
+                if (track->type != MATROSKA_TRACK_TYPE_SUBTITLE ||
+                    lace_duration <= INT_MAX) {
+                    /*
+                     * For non subtitle tracks, just store the duration
+                     * as normal.
+                     *
+                     * If it's a subtitle track and duration value does
+                     * not overflow a uint32, then also store it normally.
+                     */
                     pkt->duration = lace_duration;
+                }
 
                 if (st->codec->codec_id == AV_CODEC_ID_SSA)
                     matroska_fix_ass_packet(matroska, pkt, lace_duration);
diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index 397793119e..79ce9f5cae 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -1168,7 +1168,10 @@ static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt)
         duration = mkv_write_srt_blocks(s, pb, pkt);
     } else {
         ebml_master blockgroup = start_ebml_master(pb, MATROSKA_ID_BLOCKGROUP, mkv_blockgroup_size(pkt->size));
-        duration = pkt->convergence_duration;
+        /* For backward compatibility, prefer convergence_duration. */
+        if (pkt->convergence_duration > 0) {
+            duration = pkt->convergence_duration;
+        }
         mkv_write_block(s, pb, MATROSKA_ID_BLOCK, pkt, 0);
         put_ebml_uint(pb, MATROSKA_ID_BLOCKDURATION, duration);
         end_ebml_master(pb, blockgroup);
diff --git a/libavformat/srtenc.c b/libavformat/srtenc.c
index 6b8278fa80..0b094b00bf 100644
--- a/libavformat/srtenc.c
+++ b/libavformat/srtenc.c
@@ -65,6 +65,7 @@ static int srt_write_packet(AVFormatContext *avf, AVPacket *pkt)
         int len;
 
         if (d <= 0)
+            /* For backward compatibility, fallback to convergence_duration. */
             d = pkt->convergence_duration;
         if (s == AV_NOPTS_VALUE || d <= 0) {
             av_log(avf, AV_LOG_ERROR, "Insufficient timestamps.\n");