From b3143e8c140239a2833d8efcfb39b718f2d30b98 Mon Sep 17 00:00:00 2001
From: langhuihui <178529795@qq.com>
Date: Mon, 2 Jun 2025 22:31:25 +0800
Subject: [PATCH] fix: mp4 download

---
 plugin/mp4/api.go | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/plugin/mp4/api.go b/plugin/mp4/api.go
index 6a82868..5e3fdbf 100644
--- a/plugin/mp4/api.go
+++ b/plugin/mp4/api.go
@@ -249,12 +249,13 @@ func (p *MP4Plugin) download(w http.ResponseWriter, r *http.Request) {
 		}
 		if i == 0 {
 			startTimestamp := startTime.Sub(stream.StartTime).Milliseconds()
-			var startSample *box.Sample
-			if startSample, err = demuxer.SeekTime(uint64(startTimestamp)); err != nil {
-				tsOffset = 0
-				continue
+			if startTimestamp > 0 {
+				var startSample *box.Sample
+				if startSample, err = demuxer.SeekTime(uint64(startTimestamp)); err != nil {
+					continue
+				}
+				tsOffset = -int64(startSample.Timestamp)
 			}
-			tsOffset = -int64(startSample.Timestamp)
 		}
 		var part *ContentPart
 		for track, sample := range demuxer.RangeSample {