语音转文本接口，bgm路径修复

app/api/fetcher/media.ts

@@ -1,12 +1,8 @@
 export const runtime = 'nodejs'
 
-import { promises as fs } from 'fs';
-import os from 'os';
-import path from 'path';
 import { execFile } from 'child_process';
 import { promisify } from 'util';
 
-const execFileAsync = promisify(execFile);
 
 export function pickBestPlayAddr(variants: PlayVariant[] | undefined | null) {
     if (!variants?.length) return null;
@@ -19,74 +15,3 @@ export function pickBestPlayAddr(variants: PlayVariant[] | undefined | null) {
 
     return best?.play_addr ?? null;
 }
-
-/**
- * 使用 ffmpeg 从视频二进制中提取第一帧，返回 JPEG buffer
- */
-export async function extractFirstFrame(videoBuffer: Buffer): Promise<{ buffer: Buffer; contentType: string; ext: string } | null> {
-    const ffmpegCmd = process.env.FFMPEG_PATH || 'ffmpeg';
-    const tmpDir = os.tmpdir();
-    const base = `dy_${Date.now()}_${Math.random().toString(36).slice(2, 8)}`;
-    const inPath = path.join(tmpDir, `${base}.mp4`);
-    const outPath = path.join(tmpDir, `${base}.jpg`);
-
-    try {
-        await fs.writeFile(inPath, videoBuffer);
-        const args = [
-            '-hide_banner',
-            '-loglevel', 'error',
-            '-ss', '0',
-            '-i', inPath,
-            '-frames:v', '1',
-            '-q:v', '2',
-            '-f', 'image2',
-            '-y',
-            outPath,
-        ];
-        await execFileAsync(ffmpegCmd, args, { windowsHide: true });
-        const img = await fs.readFile(outPath);
-        return { buffer: img, contentType: 'image/jpeg', ext: 'jpg' };
-    } catch (e: any) {
-        if (e && (e.code === 'ENOENT' || /not found|is not recognized/i.test(String(e.message)))) {
-            console.warn('系统未检测到 ffmpeg，可安装并配置 PATH 或设置 FFMPEG_PATH 后启用封面提取。');
-            return null;
-        }
-        throw e;
-    } finally {
-        try { await fs.unlink(inPath); } catch { }
-        try { await fs.unlink(outPath); } catch { }
-    }
-}
-
-/**
- * 使用 ffprobe 获取视频时长（毫秒）
- */
-export async function getVideoDuration(videoBuffer: Buffer): Promise<number | null> {
-    const ffprobeCmd = process.env.FFPROBE_PATH || 'ffprobe';
-    const tmpDir = os.tmpdir();
-    const base = `dy_${Date.now()}_${Math.random().toString(36).slice(2, 8)}`;
-    const inPath = path.join(tmpDir, `${base}.mp4`);
-
-    try {
-        await fs.writeFile(inPath, videoBuffer);
-        const args = [
-            '-v', 'error',
-            '-show_entries', 'format=duration',
-            '-of', 'default=noprint_wrappers=1:nokey=1',
-            inPath,
-        ];
-        const { stdout } = await execFileAsync(ffprobeCmd, args, { windowsHide: true });
-        const durationSeconds = parseFloat(stdout.trim());
-        if (isNaN(durationSeconds)) return null;
-        return Math.round(durationSeconds * 1000); // 转换为毫秒
-    } catch (e: any) {
-        if (e && (e.code === 'ENOENT' || /not found|is not recognized/i.test(String(e.message)))) {
-            console.warn('系统未检测到 ffprobe，可安装并配置 PATH 或设置 FFPROBE_PATH 后启用时长提取。');
-            return null;
-        }
-        console.warn(`获取视频时长失败: ${e?.message || e}`);
-        return null;
-    } finally {
-        try { await fs.unlink(inPath); } catch { }
-    }
-}