From 6d61bf24286596bec680347b2b9f88653f5a157c Mon Sep 17 00:00:00 2001
From: duoaohui <928970622@qq.com>
Date: Tue, 19 May 2026 14:15:53 +0800
Subject: [PATCH] =?UTF-8?q?=E8=A7=86=E9=A2=91=E4=BF=9D=E5=AD=98?=
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---
 .../src/services/recording.service.ts         | 23 +++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/media-server/src/services/recording.service.ts b/media-server/src/services/recording.service.ts
index e506aad..dc11a1b 100644
--- a/media-server/src/services/recording.service.ts
+++ b/media-server/src/services/recording.service.ts
@@ -515,6 +515,18 @@ export async function startRecording(input: StartRecordingInput): Promise<StartR
     const args = buildFfmpegArgs(sdpFilePath, outputPath);
     ffmpegProc = spawn(ffmpegBin, args, { stdio: ['ignore', 'pipe', 'pipe'] });
 
+    // ffmpeg stderr 环形缓冲：正常运行时 debug 级 + 不落盘，
+    // 进程异常退出时把最后 N KB stderr 一次性以 error 级 dump 出来，方便定位 code=1 类问题
+    // 上限 16 KB 足以覆盖典型 ffmpeg 启动失败诊断（codec/端口/SDP 解析等），且容量可控
+    const STDERR_TAIL_LIMIT = 16 * 1024;
+    let stderrTail = '';
+    const appendStderrTail = (text: string) => {
+      stderrTail += text;
+      if (stderrTail.length > STDERR_TAIL_LIMIT) {
+        stderrTail = stderrTail.slice(stderrTail.length - STDERR_TAIL_LIMIT);
+      }
+    };
+
     const exited = new Promise<void>((resolve) => {
       ffmpegProc!.once('exit', (code, signal) => {
         const entry = recordingMap.get(id);
@@ -522,8 +534,9 @@ export async function startRecording(input: StartRecordingInput): Promise<StartR
           entry.exitCode = code;
           if (!entry.stopping && code !== 0) {
             entry.failureReason = `ffmpeg exited unexpectedly code=${code} signal=${signal ?? ''}`;
+            // 异常退出：把 stderr tail 落 error 级，便于线上排查 ffmpeg 失败根因
             log.error(
-              { recordingId: id, code, signal },
+              { recordingId: id, code, signal, stderrTail: stderrTail.trim() },
               'ffmpeg exited unexpectedly before stop',
             );
             // Phase B watchdog：异步触发失败回调（webhook + 用户回调），不阻塞 exit 处理
@@ -533,7 +546,7 @@ export async function startRecording(input: StartRecordingInput): Promise<StartR
           // entry 还没入 map（startRecording 末尾才插入）→ 走 spawn 失败兜底，避免 webhook 漏报
           // startRecording 同步路径会自己 throw + rollback，这里上报只为防止上层 DB 行已存在的边缘场景
           log.error(
-            { recordingId: id, code, signal },
+            { recordingId: id, code, signal, stderrTail: stderrTail.trim() },
             'ffmpeg exited before recording entry registered',
           );
           fireSpawnFailure({
@@ -541,7 +554,7 @@ export async function startRecording(input: StartRecordingInput): Promise<StartR
             roomCode: input.roomCode,
             routerId: input.routerId,
             exitCode: code,
-            failureReason: `ffmpeg exited during spawn code=${code} signal=${signal ?? ''}`,
+            failureReason: `ffmpeg exited during spawn code=${code} signal=${signal ?? ''}; stderr_tail=${stderrTail.trim().slice(-512)}`,
           });
         }
         resolve();
@@ -550,7 +563,9 @@ export async function startRecording(input: StartRecordingInput): Promise<StartR
 
     ffmpegProc.stderr?.on('data', (chunk: Buffer) => {
       const text = chunk.toString('utf-8');
-      // ffmpeg 默认大部分日志走 stderr；只在 debug 级别落，避免日志爆炸
+      // 1) 永远写入环形缓冲，供进程异常退出时 dump
+      appendStderrTail(text);
+      // 2) 正常实时日志仍走 debug 级，避免高频日志爆炸
       log.debug({ recordingId: id }, `[ffmpeg] ${text.trim()}`);
     });