Volcengine Ata Subtitle

Generate subtitles with automatic time alignment using Volcengine ATA API. Use when the user wants to: (1) add time-aligned subtitles to videos, (2) convert text + audio to SRT/ASS format, or (3) automate subtitle creation workflow.

Volcengine ATA Subtitle (自动打轴)

Generate subtitles with automatic time alignment using Volcengine's ATA (Automatic Time Alignment) API.

Prerequisites

Set the following environment variables or create a config file:

Option A: Environment Variables

bash

export VOLC_ATA_APP_ID="your-app-id"
export VOLC_ATA_TOKEN="your-access-token"
export VOLC_ATA_API_BASE="https://openspeech.bytedance.com"

Option B: Config File

Create ~/.volcengine_ata.conf:

ini

[credentials]
appid = your-app-id
access_token = your-access-token
secret_key = your-secret-key

[api]
base_url = https://openspeech.bytedance.com
submit_path = /api/v1/vc/ata/submit
query_path = /api/v1/vc/ata/query

Execution (Python CLI Tool)

A Python CLI tool is provided at ~/.openclaw/workspace/skills/volcengine-ata-subtitle/volc_ata.py.

Quick Examples

bash

# Basic usage: audio + text → SRT subtitle
python3 ~/.openclaw/workspace/skills/volcengine-ata-subtitle/volc_ata.py \
  --audio storage/audio.wav \
  --text storage/subtitle.txt \
  --output storage/subtitles/final.srt

# Specify output format (srt or ass)
python3 ~/.openclaw/workspace/skills/volcengine-ata-subtitle/volc_ata.py \
  --audio storage/audio.wav \
  --text storage/subtitle.txt \
  --output storage/subtitles/final.ass \
  --format ass

Input Requirements

Audio File

• Format: WAV (PCM)
• Sample Rate: 16000 Hz (16kHz)
• Channels: 1 (mono)
• Encoding: 16-bit PCM (pcm_s16le)

Extract from video:

bash

ffmpeg -i input.mp4 -vn -acodec pcm_s16le -ar 16000 -ac 1 audio.wav

Text File

• Format: Plain text (UTF-8)
• Structure: One sentence per line
• No punctuation: ATA will handle automatically
• No timestamps: Pure text only

Example:

text

主人闹钟没响睡过头了
我们俩轮流用鼻子拱他脸
他以为地震了抱着枕头就跑

Output Formats

SRT (SubRip)

srt

1
00:00:00,000 --> 00:00:02,500
第一句字幕

2
00:00:02,500 --> 00:00:05,000
第二句字幕

ASS (Advanced Substation Alpha)

ass

[Script Info]
Title: ATA Subtitles
ScriptType: v4.00+

[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.00,0:00:02.50,Default,,0,0,0,,第一句字幕

Rules

1. Always check that credentials are configured before making API calls.
2. Audio must be 16kHz mono PCM - convert if necessary with ffmpeg.
3. Text should be plain - no timestamps, no punctuation.
4. Default format: SRT (most compatible).
5. Handle errors gracefully - display clear error messages.

Troubleshooting

Invalid Sample Rate

Error: Invalid sample rate, expected 16000Hz

Fix:

bash

ffmpeg -i input.mp4 -ar 16000 -ac 1 audio.wav

Authorization Failed

Error: Authorization failed

Fix: Check token format. Should be Bearer; {token} (with semicolon).

Related Documents

• Volcengine ATA Docs