diff --git a/CHANGELOG.md b/CHANGELOG.md
index 66746cd..921af57 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # CHANGELOG - apigo.cc/go/vision
 
+## v1.5.4 (2026-07-18)
+- **视频预览修复**: 采样避开低帧率视频无帧的尾部区间，测试在 FFmpeg 未提供 `libwebp` 编码器时正确跳过相关集成项。
+- **依赖校验修复**: 重新整理模块图并补齐 checksum。
+
 ## v1.5.3 (2026-06-21)
 - **JS 对齐**: 重构 JS 导出为具名函数，并引入 `jsmod.MakeError` 动态包装错误以获取调用栈。
 - **依赖更新**: 升级依赖 `jsmod` 至 `v1.5.3`，`cast` 至 `v1.5.3`，`rand` 至 `v1.5.3`，`encoding` 至 `v1.5.4`，`safe` 至 `v1.5.2`，`file` 至 `v1.5.5`。
diff --git a/TEST.md b/TEST.md
index 03c13c3..f8b8179 100644
--- a/TEST.md
+++ b/TEST.md
@@ -1,5 +1,8 @@
 # Testing @go/vision
 
+## v1.5.4 验证
+- 全量测试与图像处理基准测试通过；FFmpeg 能力相关用例按本机编码器能力执行。
+
 `go/vision` 拥有完善的单元测试覆盖，确保在各种图像处理场景下的稳定性。
 
 ## 运行测试
diff --git a/go.mod b/go.mod
index 4b66179..91f55f5 100644
--- a/go.mod
+++ b/go.mod
@@ -17,8 +17,8 @@ require (
 )
 
 require (
-	apigo.cc/go/encoding v1.5.4
-	apigo.cc/go/safe v1.5.2
+	apigo.cc/go/encoding v1.5.4 // indirect
+	apigo.cc/go/safe v1.5.2 // indirect
 	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
 	github.com/kr/text v0.2.0 // indirect
 	golang.org/x/crypto v0.52.0 // indirect
diff --git a/go.sum b/go.sum
index 47698d6..5fb6c2c 100644
--- a/go.sum
+++ b/go.sum
@@ -1,15 +1,15 @@
-apigo.cc/go/cast v1.5.0 h1:UBGJtFQ8eJPMQXs37cUgqd7YQo1zI9opuSDBDmn2/pE=
-apigo.cc/go/cast v1.5.0/go.mod h1:z2GW5p5WCZGEqVVIJUdhl232vRbLf2Qu4EDlEakX/D8=
-apigo.cc/go/encoding v1.5.0 h1:EJNdRVDOMoI2DAvZwQNQTbYuqB/6zsEzvg7lS5pQI+I=
-apigo.cc/go/encoding v1.5.0/go.mod h1:8++NfZj3hWig0qh2g7GQRw/4LpSvCYMWUZ+8J+x58cA=
-apigo.cc/go/file v1.5.0 h1:Fh1NSDBqaxjuXYJ71yPHPXVJ8BFEv/AGS3l+jkLi5uw=
-apigo.cc/go/file v1.5.0/go.mod h1:4YhOGgBINTpmmmgws3H8LAyXQQBGzBp44hYUoCS+kr0=
-apigo.cc/go/jsmod v1.5.0 h1:JgQtJNiJWy1NOP9AzE8NX5VXJkpO/x3GqLsCCSny5Ec=
-apigo.cc/go/jsmod v1.5.0/go.mod h1:bmyeZtOAP/j5am+YRnaiM89smysK24K7ebk0koFtsSw=
-apigo.cc/go/rand v1.5.0 h1:1o8hh8fhdBuk1/h02IvugvamuT3dkWbVJrqEJVQKB2E=
-apigo.cc/go/rand v1.5.0/go.mod h1:Lh98S2dm9UY0X+M+kNQQEKyXHG5pcCKSFPyXN0QCGdk=
-apigo.cc/go/safe v1.5.0 h1:W1NblmcU8cex1f9Y5z8mNLUJOzZTE1s6fszb3FbhGnk=
-apigo.cc/go/safe v1.5.0/go.mod h1:OfQ5d6COePSGEuPvMeOk6KagX2sezw7nvKh7exj9SeM=
+apigo.cc/go/cast v1.5.3 h1:jk6VX0rGFhjKtfPhsaV6IKYpiGmORRk9qPTtuNS53tw=
+apigo.cc/go/cast v1.5.3/go.mod h1:GMjjrYn93tWat1U409G7h1jR3ejfLLI7r0efBo9Sbd4=
+apigo.cc/go/encoding v1.5.4 h1:Fk8TrveZATyy8SHukC4ZiqdTSp+QIfsRHtt55xmMK7w=
+apigo.cc/go/encoding v1.5.4/go.mod h1:dShEsZ3gKqBINz7TSOYf4e7/fBCqCY9VzlenoGUQUFM=
+apigo.cc/go/file v1.5.5 h1:/+HmDumLu6Qk2KuQL63M9lpgzHTDL+QJ8dStOl7e9gs=
+apigo.cc/go/file v1.5.5/go.mod h1:xRVNhctvqOKeBemmcRW/BQfgkc3B+vT/UZVdSc7duUo=
+apigo.cc/go/jsmod v1.5.3 h1:S3W317bH0QV2NMeRO1E0v6ySIBOfMWYv/NuQJbvqKWU=
+apigo.cc/go/jsmod v1.5.3/go.mod h1:bmyeZtOAP/j5am+YRnaiM89smysK24K7ebk0koFtsSw=
+apigo.cc/go/rand v1.5.3 h1:O4bPIwyaOWEBCr0nL9A4G4qG48AqiGTCzfPeckm3Ius=
+apigo.cc/go/rand v1.5.3/go.mod h1:q1BTFkY/cXE229dDD5Q22lF7T0DoKPV6xAu+6bCrDH4=
+apigo.cc/go/safe v1.5.2 h1:EnuEOW/SGwf/5A0nw9LnqfKJE071+TIc6ez8HI9R9Lg=
+apigo.cc/go/safe v1.5.2/go.mod h1:2GqCCLLGex4OAhdET3iBWm1R+LIYtmTrvHP8W0iESSw=
 github.com/boombuler/barcode v1.1.0 h1:ChaYjBR63fr4LFyGn8E8nt7dBSt3MiU3zMOZqFvVkHo=
 github.com/boombuler/barcode v1.1.0/go.mod h1:paBWMcWSl3LHKBqUq+rly7CNSldXjb2rDl3JlRe0mD8=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
@@ -32,10 +32,12 @@ github.com/rogpeppe/go-internal v1.14.1/go.mod h1:MaRKkUm5W0goXpeCfT7UZI6fk/L7L7
 github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e h1:MRM5ITcdelLK2j1vwZ3Je0FKVCfqOLp5zO6trqMLYs0=
 github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e/go.mod h1:XV66xRDqSt+GTGFMVlhk3ULuV0y9ZmzeVGR4mloJI3M=
 golang.org/x/crypto v0.52.0 h1:RMs7fP2rXdep0CftQlK8Uf+kibLm7qkCcradZWYz988=
+golang.org/x/crypto v0.52.0/go.mod h1:1QgfPxDqh0T2M/elOJtp9RvuR95kVjir0e6/BvEmGbc=
 golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
 golang.org/x/image v0.40.0 h1:Tw4GyDXMo+daZN1znreBRC3VayR1aLFUyUEOLUdW1a8=
 golang.org/x/image v0.40.0/go.mod h1:uIc348UZMSvS5Z65CVZ7iDPaNobNFEPeJ4kbqTOszmA=
 golang.org/x/sys v0.45.0 h1:dO4czNzziLiiXplLQgBCEpCvXQ3dnkn0SdaZSYdQ+FY=
+golang.org/x/sys v0.45.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.37.0 h1:Cqjiwd9eSg8e0QAkyCaQTNHFIIzWtidPahFWR83rTrc=
 golang.org/x/text v0.37.0/go.mod h1:a5sjxXGs9hsn/AJVwuElvCAo9v8QYLzvavO5z2PiM38=
diff --git a/preview.go b/preview.go
index 6b7d589..40668a0 100644
--- a/preview.go
+++ b/preview.go
@@ -83,7 +83,7 @@ func GenerateVideoPreview(videoPath, outPath string, width, height int, frameInt
 
 	times := make([]float64, frameCount)
 	for i := 0; i < frameCount; i++ {
-		times[i] = duration * (0.10 + 0.80*(float64(i)/float64(frameCount-1)))
+		times[i] = duration * (0.10 + 0.65*(float64(i)/float64(frameCount-1)))
 	}
 
 	// 2a. 动画模式 (.webp, .gif)
@@ -152,7 +152,7 @@ func GenerateAudioPreview(mediaPath, outPath string) error {
 }
 
 func getVideoDuration(videoPath string) (float64, error) {
-	out, err := exec.Command("ffprobe", "-v", "error", "-show_entries", "format=duration", "-of", "default=noprint_wrappers=1:nokey=1", videoPath).Output()
+	out, err := exec.Command("ffprobe", "-v", "error", "-select_streams", "v:0", "-show_entries", "stream=duration", "-of", "default=noprint_wrappers=1:nokey=1", videoPath).Output()
 	if err != nil {
 		return 0, err
 	}
@@ -160,4 +160,3 @@ func getVideoDuration(videoPath string) (float64, error) {
 	_, err = fmt.Sscanf(strings.TrimSpace(string(out)), "%f", &duration)
 	return duration, err
 }
-
diff --git a/preview_test.go b/preview_test.go
index dce03b9..952644d 100644
--- a/preview_test.go
+++ b/preview_test.go
@@ -1,6 +1,7 @@
 package vision
 
 import (
+	"bytes"
 	"fmt"
 	"image/color"
 	"os"
@@ -37,20 +38,21 @@ func TestPreviewer(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	
+
 	// 这里通过 ffmpeg 拼接图片并添加一个静音音频产生视频
 	err = v.CreateVideoFromImages(filepath.Join(tmpDir, "frame_%d.png"), 1, videoPath)
 	if err != nil {
 		t.Skip("FFmpeg video generation failed, skipping integration test")
 	}
-	
+
 	// 为测试视频添加静音音频，否则提取音频会失败
 	audioPath := filepath.Join(tmpDir, "silent.aac")
 	err = exec.Command("ffmpeg", "-f", "lavfi", "-i", "anullsrc=r=44100:cl=mono", "-t", "5", "-c:a", "aac", audioPath).Run()
 	if err == nil {
 		finalVideo := filepath.Join(tmpDir, "final.mp4")
-		exec.Command("ffmpeg", "-i", videoPath, "-i", audioPath, "-c", "copy", finalVideo).Run()
-		videoPath = finalVideo
+		if err = exec.Command("ffmpeg", "-i", videoPath, "-i", audioPath, "-c", "copy", finalVideo).Run(); err == nil {
+			videoPath = finalVideo
+		}
 	}
 
 	// 3. 测试 Preview 功能
@@ -67,7 +69,11 @@ func TestPreviewer(t *testing.T) {
 	})
 
 	t.Run("GenerateVideoPreview", func(t *testing.T) {
-		err := GenerateVideoPreview(videoPath, webPPath, 160, 120)
+		encoders, err := exec.Command("ffmpeg", "-hide_banner", "-encoders").Output()
+		if err != nil || !bytes.Contains(encoders, []byte("libwebp")) {
+			t.Skip("FFmpeg does not provide the libwebp encoder")
+		}
+		err = GenerateVideoPreview(videoPath, webPPath, 160, 120)
 		if err != nil {
 			t.Errorf("GenerateVideoPreview failed: %v", err)
 		}