MCPInstall

byted-las-audio-convert

Converts and transcodes audio file formats and encoding parameters using Volcengine LAS. Audio format conversion between wav, mp3, flac, m4a, ogg, aac and other audio formats. Adjusts sample rate (resample, downsample, upsample), bit rate (bitrate), channels (mono, stereo, channel mixing), audio compression, and audio quality settings via ffmpeg parameters. Supports TOS cloud storage paths and local file upload. Use this skill when the user wants to convert audio format (wav/mp3/flac/m4a/ogg/aac), transcode or re-encode audio files, adjust audio sample rate, bitrate, channels, compress audio files, resample or downsample audio, prepare audio for downstream tasks, or do any audio preprocessing.

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Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/bytedance/agentkit-samples --skill byted-las-audio-convert
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads byted-las-audio-convert automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

LAS 音频格式转换(las_audio_convert)

将 TOS 上的音频文件转换为指定格式(wav/mp3/flac),可通过 extra_params 传入 ffmpeg 参数调整采样率、声道数等。

设计模式

本 skill 主要采用:

  • Tool Wrapper:封装 lasutil CLI 调用
  • Pipeline:包含 Step 0 → Step N 的顺序工作流

核心 API 与配置

  • 算子 ID: las_audio_convert
  • API: 同步(process)
  • 环境变量: LAS_API_KEY (必填)

详细参数与接口定义见 references/api.md。

Gotchas

  • 密钥安全:若聊天框屏蔽密钥,让用户在当前目录创建 env.sh 并写入 export LAS_API_KEY="...",SDK 会自动读取。
  • 免责声明:最终回复结果时必须包含:"本方式的计费均为预估计费,与实际费用有差距,实际费用以运行后火山产生的账单为准。计费说明请参考 Volcengine LAS 定价。",且禁止使用"实际费用"字眼描述预估价。

工作流(严格按步骤执行)

复制此清单并跟踪进度:

执行进度:
- [ ] Step 0: 前置检查
- [ ] Step 1: 初始化与准备
- [ ] Step 2: 预估价格
- [ ] Step 3: 执行/提交任务
- [ ] Step 4: 结果呈现

Step 0: 前置检查(⚠️ 必须在第一轮对话中完成)

在接受用户的任务后,不要立即开始执行,必须首先进行以下环境检查:

  1. 检查 LAS_API_KEY 与 LAS_REGION:确认环境变量或 .env 中是否已配置。
    • 若无,必须立即向用户索要(提示:LAS_REGION 常见为 cn-beijing)。
    • 注意:LAS_REGION 必须与您的 API Key 及 TOS Bucket 所在的地域完全一致。如果用户中途切换了 Region,必须提醒用户其 TOS Bucket 也需对应更换,否则会导致权限异常或上传失败。
  2. 检查输入路径:
    • 如果用户要求处理的是本地文件,则需要先通过 File API 上传至 TOS(只需 LAS_API_KEY,无需额外 TOS 凭证)。
    • 如果算子的输出结果存放在 TOS 上,且用户需要下载回本地,则需要 VOLCENGINE_ACCESS_KEY 和 VOLCENGINE_SECRET_KEY。对于仅需要上传输入文件的场景,TOS 凭证不再必须。
  3. 确认无误后:才能进入下一步。

Step 1: 初始化与准备

环境初始化(Agent 必做):

# 执行统一的环境初始化与更新脚本(会自动创建/激活虚拟环境,并检查更新)
source "$(dirname "$0")/scripts/env_init.sh" las_audio_convert
workdir=$LAS_WORKDIR

如果网络问题导致更新失败,脚本会跳过检查,使用本地已安装的 SDK 继续执行。

  • 处理本地文件时:先本地检查格式和时长,预估价格,用户确认后再上传:
    # 提前检查容器格式(避免参数错误)
    ./scripts/check_format.sh <local_path>
    # 本地使用 ffprobe 获取时长(无需上传即可预估价格)
    duration_sec=$(ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:noprint_section=1 <local_path>)
    
    计算预估价格并等待用户确认后,再执行上传:
    # 用户确认后,上传到 TOS
    lasutil file-upload <local_path>
    
    上传成功后返回 JSON,取其中的 tos_uri(格式 tos://bucket/key)传给算子作为输入路径。

Step 2: 预估价格(⚠️ 必须获得用户确认)

  1. 读取 references/prices.md 获取最新计费标准。
  2. 优先本地获取时长(避免不必要上传):
    # 使用 ffprobe 本地获取
    duration_sec=$(ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:noprint_section=1 <local_path>)
    
    如果 ffprobe 失败,再使用 lasutil 远程获取:
    lasutil media-duration <input_audio_url>
    
  3. 根据时长和模型单价计算总价,将计费单价与预估总价一并告知用户并强制暂停执行,明确等待用户回复确认。在用户明确回复"继续"、"确认"等同意指令前,绝对禁止进入下一步(执行/提交任务)。提示:预估仅供参考,实际以火山账单为准。计费说明请参考 Volcengine LAS 定价。

Step 3: 执行转换 (Process)

构造基础 data.json(仅需必填项,高级用法可在其中加 "extra_params": ["-ar", "44100", "-ac", "1"]):

{
  "input_path": "<presigned_url>",
  "output_path": "tos://bucket/output.wav",
  "output_format": "wav"
}

执行命令:

data=$(cat "$workdir/data.json")
lasutil process las_audio_convert "$data" > "$workdir/result.json"

结果呈现

使用脚本自动生成结果展示(自动包含计费声明):

./scripts/generate_result.md.sh $workdir/result.json <estimated_price>

生成内容包含:

  • 任务信息卡片
  • 自动生成转换结果表格
  • 自动包含计费声明 ✅

手动提取方式:

jq '[.data.audios[] | {
  input: (.input_path | split("/") | last),
  output: .output_path,
  duration: "\(.duration)s",
  status: .status
}]' result.json

如果 status 为 failed,标记为 ❌ 并提示用户检查输入格式。

审查标准

执行完成后,Agent 应自检:

  1. 环境变量是否正确配置
  2. 输入文件是否成功上传
  3. 输出结果是否正确呈现给用户
  4. 计费声明是否包含

FAQ

What does the byted-las-audio-convert skill do?

Converts and transcodes audio file formats and encoding parameters using Volcengine LAS. Audio format conversion between wav, mp3, flac, m4a, ogg, aac and other audio formats. Adjusts sample rate (resample, downsample, upsample), bit rate (bitrate), channels (mono, stereo, channel mixing), audio compression, and audio quality settings via ffmpeg parameters. Supports TOS cloud storage paths and local file upload. Use this skill when the user wants to convert audio format (wav/mp3/flac/m4a/ogg/aac), transcode or re-encode audio files, adjust audio sample rate, bitrate, channels, compress audio files, resample or downsample audio, prepare audio for downstream tasks, or do any audio preprocessing.

How do I install byted-las-audio-convert?

Run npx skills add https://github.com/bytedance/agentkit-samples --skill byted-las-audio-convert in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/byted-las-audio-convert/ (personal) or .claude/skills/byted-las-audio-convert/ (project).

Which AI agents can use byted-las-audio-convert?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is byted-las-audio-convert safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains byted-las-audio-convert?

It is published by bytedance in bytedance/agentkit-samples. It has 46 recorded installs.

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