diff --git a/libavformat/iff.c b/libavformat/iff.c
index 3c861ef34d..b37600605a 100644
--- a/libavformat/iff.c
+++ b/libavformat/iff.c
@@ -384,7 +384,7 @@ static int read_dst_frame(AVFormatContext *s, AVPacket *pkt)
                 avio_skip(pb, 1);
             pkt->flags |= AV_PKT_FLAG_KEY;
             pkt->stream_index = 0;
-            pkt->duration = 588LL * s->streams[0]->codecpar->sample_rate / 44100;
+            pkt->duration = s->streams[0]->codecpar->sample_rate / 75;
             pkt->pos = chunk_pos;
 
             chunk_pos = avio_tell(pb);
@@ -397,7 +397,8 @@ static int read_dst_frame(AVFormatContext *s, AVPacket *pkt)
         case ID_FRTE:
             if (data_size < 4)
                 return AVERROR_INVALIDDATA;
-            s->streams[0]->duration = avio_rb32(pb) * 588LL * s->streams[0]->codecpar->sample_rate / 44100;
+            s->streams[0]->duration = avio_rb32(pb) * (uint64_t)s->streams[0]->codecpar->sample_rate / 75;
+
             break;
         }