视频保存

backend/go-service/app/file/service/file_service.go

@@ -19,6 +19,7 @@ import (
 	"github.com/disintegration/imaging"
 	"github.com/echochat/backend/config"
 	"github.com/echochat/backend/pkg/logs"
+	"github.com/echochat/backend/pkg/storage"
 	"github.com/google/uuid"
 	"github.com/minio/minio-go/v7"
 	"go.uber.org/zap"
@@ -259,12 +260,5 @@ func (s *FileService) UploadVoice(ctx context.Context, fileHeader *multipart.Fil
 
 // buildURL 根据 MinIO 配置构建文件访问 URL
 func (s *FileService) buildURL(objectName string) string {
-	if base := strings.TrimRight(strings.TrimSpace(s.minioCfg.PublicBaseURL), "/"); base != "" {
+	return storage.BuildObjectURL(s.minioCfg, objectName)
-		return fmt.Sprintf("%s/%s", base, objectName)
-	}
-	scheme := "http"
-	if s.minioCfg.UseSSL {
-		scheme = "https"
-	}
-	return fmt.Sprintf("%s://%s/%s/%s", scheme, s.minioCfg.Endpoint, s.minioCfg.Bucket, objectName)
 }

backend/go-service/app/meeting/service/meeting_recording_service.go

@@ -16,6 +16,7 @@ import (
 	"github.com/echochat/backend/app/meeting/model"
 	"github.com/echochat/backend/config"
 	"github.com/echochat/backend/pkg/logs"
+	"github.com/echochat/backend/pkg/storage"
 	"github.com/minio/minio-go/v7"
 	"github.com/redis/go-redis/v9"
 	"go.uber.org/zap"
@@ -503,14 +504,7 @@ func (s *MeetingRecordingService) uploadRecording(ctx context.Context, localPath
 }
 
 func (s *MeetingRecordingService) buildRecordingURL(objectKey string) string {
-	if base := strings.TrimRight(strings.TrimSpace(s.minioCfg.PublicBaseURL), "/"); base != "" {
+	return storage.BuildObjectURL(s.minioCfg, objectKey)
-		return fmt.Sprintf("%s/%s", base, objectKey)
-	}
-	scheme := "http"
-	if s.minioCfg.UseSSL {
-		scheme = "https"
-	}
-	return fmt.Sprintf("%s://%s/%s/%s", scheme, s.minioCfg.Endpoint, s.minioCfg.Bucket, objectKey)
 }
 
 // prepareUploadArtifact 决定最终上传到 MinIO 的产物
@@ -542,8 +536,30 @@ func (s *MeetingRecordingService) prepareUploadArtifact(ctx context.Context, web
 			zap.Int64("recording_id", recordingID), zap.String("webm_path", webmPath), zap.Error(err))
 		return webmPath, ".webm", "video/webm", ""
 	}
+	webmStat, webmStatErr := os.Stat(webmPath)
+	mp4Stat, mp4StatErr := os.Stat(mp4Path)
+	if webmStatErr == nil && mp4StatErr == nil {
+		if mp4Stat.Size() >= webmStat.Size() {
+			logs.Warn(ctx, funcName, "MP4 转码产物未变小，回退上传原始 webm",
+				zap.Int64("recording_id", recordingID),
+				zap.String("webm_path", webmPath),
+				zap.Int64("webm_size_bytes", webmStat.Size()),
+				zap.String("mp4_path", mp4Path),
+				zap.Int64("mp4_size_bytes", mp4Stat.Size()))
+			return webmPath, ".webm", "video/webm", mp4Path
+		}
+		logs.Info(ctx, funcName, "WebM→MP4 转码完成",
+			zap.Int64("recording_id", recordingID),
+			zap.String("mp4_path", mp4Path),
+			zap.Int64("webm_size_bytes", webmStat.Size()),
+			zap.Int64("mp4_size_bytes", mp4Stat.Size()))
+		return mp4Path, ".mp4", "video/mp4", mp4Path
+	}
 	logs.Info(ctx, funcName, "WebM→MP4 转码完成",
-		zap.Int64("recording_id", recordingID), zap.String("mp4_path", mp4Path))
+		zap.Int64("recording_id", recordingID),
+		zap.String("mp4_path", mp4Path),
+		zap.NamedError("webm_stat_error", webmStatErr),
+		zap.NamedError("mp4_stat_error", mp4StatErr))
 	return mp4Path, ".mp4", "video/mp4", mp4Path
 }
 
@@ -555,8 +571,8 @@ func (s *MeetingRecordingService) prepareUploadArtifact(ctx context.Context, web
 //   - 转码产物不存在或大小为 0
 //
 // 参数选型：
-//   - -c:v libx264 -preset veryfast -crf 23：常见 1080p 短会议清晰度/CPU 折中
+//   - -c:v libx264 -preset medium -crf 30：压缩优先，避免 WebM 转 MP4 后体积变大
-//   - -c:a aac -b:a 128k：覆盖绝大多数浏览器原生播放
+//   - -c:a aac -b:a 64k：会议语音场景的体积/清晰度折中
 //   - -movflags +faststart：moov 前置，HTTP Range 即点即播
 //   - -y：覆盖目标文件，避免重复 stop 时 EEXIST
 func (s *MeetingRecordingService) transcodeWebmToMp4(ctx context.Context, webmPath string) (string, error) {
@@ -587,8 +603,8 @@ func (s *MeetingRecordingService) transcodeWebmToMp4(ctx context.Context, webmPa
 	cmd := exec.CommandContext(tctx, ffmpegPath,
 		"-y",
 		"-i", webmPath,
-		"-c:v", "libx264", "-preset", "veryfast", "-crf", "23",
+		"-c:v", "libx264", "-preset", "medium", "-crf", "30",
-		"-c:a", "aac", "-b:a", "128k",
+		"-c:a", "aac", "-b:a", "64k",
 		"-movflags", "+faststart",
 		mp4Path,
 	)

backend/go-service/config/config.docker.yaml

@@ -44,7 +44,7 @@ log:
 minio:
   endpoint: "minio:9000"
   access_key: "echochat"
-  secret_key: "echochat123456"
+  secret_key: "echochat_2026-1s32dswW@#"
   bucket: "echochat"
   use_ssl: false
   public_base_url: "http://yl.z64.cn/echochat"

backend/go-service/pkg/storage/minio.go

@@ -5,6 +5,7 @@ package storage
 import (
 	"context"
 	"fmt"
+	"strings"
 
 	"github.com/echochat/backend/config"
 	"github.com/minio/minio-go/v7"
@@ -61,3 +62,28 @@ func ensureBucketPublicRead(ctx context.Context, client *minio.Client, bucket st
 }`, bucket)
 	return client.SetBucketPolicy(ctx, bucket, policy)
 }
+
+func BuildObjectURL(cfg *config.MinioConfig, objectName string) string {
+	objectName = strings.TrimLeft(strings.TrimSpace(objectName), "/")
+	if cfg == nil {
+		return objectName
+	}
+	bucket := strings.Trim(strings.TrimSpace(cfg.Bucket), "/")
+	if base := strings.TrimRight(strings.TrimSpace(cfg.PublicBaseURL), "/"); base != "" {
+		if bucket != "" && !strings.HasSuffix(base, "/"+bucket) {
+			base = fmt.Sprintf("%s/%s", base, bucket)
+		}
+		if objectName == "" {
+			return base
+		}
+		return fmt.Sprintf("%s/%s", base, objectName)
+	}
+	scheme := "http"
+	if cfg.UseSSL {
+		scheme = "https"
+	}
+	if objectName == "" {
+		return fmt.Sprintf("%s://%s/%s", scheme, cfg.Endpoint, bucket)
+	}
+	return fmt.Sprintf("%s://%s/%s/%s", scheme, cfg.Endpoint, bucket, objectName)
+}