Cortex AI Functions: Audio

Cortex AI Audio 提供先进的 LLM 音频处理功能，包括：

  • 转录： 将口语转换为文本。
  • 说话者识别： 确定多扬声器音频文件的每个部分的发言人。
  • 时间戳提取： 识别每个口语文字的时间戳。

These capabilities are available through the AI_TRANSCRIBE function. Because AI_TRANSCRIBE is managed and hosted inside Snowflake, you can easily integrate audio processing into your data workflows without onerous setup or infrastructure management.

Note

The AI_TRANSCRIBE function also processes audio tracks in video files.

AI_TRANSCRIBE

AI_TRANSCRIBE is a fully managed SQL function that transcribes audio and video files stored in a stage, extracting text, timestamps, and speaker information. See Create stage for media files for information on creating a stage suitable for storing files for processing by AI_TRANSCRIBE.

Under the hood, AI_TRANSCRIBE orchestrates optimized AI models for transcription and speaker diarization, processing audio files of up to two hours in length. AI_TRANSCRIBE is horizontally scalable, allowing efficient batch processing by processing multiple files at the same time. Audio can be processed directly from object storage to avoid unnecessary data movement.

默认情况下，AI_TRANSCRIBE 将音频文件转换为干净、可读的文本。您还可以指定时间戳粒度，以提取每个单词或说话者变化的时间戳。对于字幕等应用程序或让用户通过点击脚本中的单词来跳转到音频的特定部分，单词级时间戳非常有用。说话者级别的时间戳有助于了解谁在会议、面试或电话中说了什么。

时间戳粒度模式结果
默认值将整个音频文件转录成一段
文字转录的每个文字都有时间戳
发言人每次更换发言人时指明谁在说话以及时间戳

支持的语言

AI_TRANSCRIBE supports the following languages, which are automatically detected. Files can contain multiple supported languages.

Note

Language detection requires audio to begin within the first five seconds of the file. For best results, trim excess silence before uploading.

  • 阿拉伯语
  • 保加利亚语
  • 广东话
  • 加泰罗尼亚语
  • 中文
  • 捷克语
  • 荷兰语
  • 英语
  • 法语
  • 德语
  • 希腊语
  • Hebrew
  • Hindi
  • 匈牙利语
  • 印尼语
  • 意大利语
  • 日语
  • 韩语
  • 拉脱维亚语
  • Malay
  • Norwegian
  • 波兰语
  • 葡萄牙语
  • 罗马尼亚语
  • 俄语
  • 塞尔维亚语
  • 斯洛文尼亚语
  • 西班牙语
  • 瑞典语
  • 泰语
  • 土耳其语
  • 乌克兰语

Supported media formats

AI_TRANSCRIBE supports the following audio and video file formats:

AudioFLAC, MP3, MP4, OGG, WAV, WEBM
VideoMKV, MP4, OGV, WEBM

Video files must contain at least one audio track in FLAC, MP3, OPUS, VORBIS, or WAV format.

示例

文本转录

The following example transcribes an audio file stored in the financial_consultation stage, returning a text transcript of the entire file. The TO_FILE function converts the staged file to a file reference.

SELECT AI_TRANSCRIBE(TO_FILE(
    '@financial_consultation', 'consultation.wav'));

响应：

{"audio_duration":321.78,"text":"Good afternoon, Robert. Thanks for calling in
today. I understand you had some concerns about your portfolio you wanted to
discuss. Yes, I'm really worried. I've been watching the news and the market's
been all over the place lately. I'm thinking maybe I should just sell
everything, all my stocks and mutual funds and put it all in bonds or CDs. At
least then I could sleep at night. I can definitely understand that concern,
Robert. Market volatility can be unsettling, especially when you're seeing
those daily swings in the headlines. Before we talk about any major moves, can
you help me understand what specifically is driving this anxiety? Is it the
recent tech sector pullback or something more general? It's everything. I'm 52
years old and I keep thinking about what happened in 2008. I lost so much then
and I'm worried we're heading for another crash with this new administration. I
can't afford to lose my retirement savings. Those are absolutely valid
concerns, and I appreciate you sharing that context. That was a really
challenging time for everyone. Let me ask you this. When we last reviewed your
portfolio in March, we had you allocated at about 70% equities and 30% bonds,
correct? And your target retirement age is still 62%. That's right. But
honestly, 70% in stocks feels way too risky right now. I'm thinking more like
20% stocks, 80% bonds, maybe even less in stocks. I understand that instinct,
Robert. Let's walk through this together. First, I want to remind you of
something important. Your current portfolio is already designed with volatility
in mind. You're not in individual stocks. You're in diversified index funds and
some actively managed funds across different sectors and even international
markets. but they're still going down. My quarterly statement showed I was down
8% this quarter alone. You're absolutely right, and that's painful to see, but
let's put this in perspective. Over the past 12 months, even with this recent
volatility, your portfolio is still up about 3%. The market has given back some
gains, but we're not in crisis territory. Remember, we built your allocation
specifically because you have 10 years until retirement. That time horizon is
actually your biggest asset here. So you're saying I should just do nothing?
Not exactly nothing, but I am suggesting we don't make dramatic changes based
on short-term market movements. However, I do hear your concern about risk
tolerance. What if we made a smaller adjustment? Instead of going to 20%
stocks, what if we moved to 60% stocks and 40% bonds? That would reduce your
equity exposure by 10%, which might help you sleep better, but wouldn't take
you completely out of the growth potential you need for retirement. That
actually sounds more reasonable, but I'm still worried about losing more
money. I understand completely. Let me ask you this. What's your bigger worry,
the volatility of the next year, two or two, or having enough money to retire
comfortably at 62? Because if we get too conservative now, inflation alone
could erode your purchasing power over the next decade. I didn't really thought
about inflation that way. I guess I've been so focused on not losing money that
I forgot about the money I might not make. Exactly. And remember, Robert,
you're not alone in this. I've had this conversation with many clients over the
past few weeks. The ones who stayed disciplined during previous market
downturns are generally glad they did. What if we also set up a plan where we
review your portfolio monthly for the next few months? That way you'll have
regular check-ins and won't feel like you're just riding this out blindly.
Monthly reviews would definitely help. And maybe the 60-40 split is a good
compromise. I just, I don't want to be stupid about this. Overt, wanting to
protect your retirement isn't stupid. It's exactly what you should be thinking
about. The key is making sure we're protecting it in the right way. Staying
invested in a diversified portfolio, even with some volatility, has
historically been the best way to preserve and grow wealth over time. okay, I
think I can live with moving to 60% stocks, but if things get really bad... If
things get really bad, we'll talk again. That's what I'm here for. And
remember, we'll be reviewing this monthly anyway. You're not locked into
anything forever. But I do want to emphasize that market timing is incredibly
difficult, even for professionals. The goal isn't to avoid all volatility.
It's to stay invested long enough to benefit from the market's long-term
upward trend. All right, Sarah, let's do the rebalancing to 60-40 and I'll try
to stop checking my account balance every day. It sounds like a solid plan,
Robert. And yes, definitely limit the daily balance checking. That's a recipe
for anxiety. I'll send you some research on historical market recoveries after
our call and we'll schedule our first monthly review for next month. How does
that sound? That sounds good. Thanks for talking me through this, Sarah. I feel
a lot better than when I call. I'm so glad to hear that, Robert. Remember,
staying invested requires patience, but your future self will thank you for it.
I'll have the rebalancing done by tomorrow morning, and you should see the
changes reflected in your account by Thursday. Perfect. Thanks again, Sarah. I
thank you deeply for your patience and understanding. I'll talk to you next
month."}

使用时间戳进行单词级分段

Set the timestamp granularity to “word” to extract precise timestamps for every word spoken, enabling searchable, navigable transcripts. Note that this audio file is in Spanish.

SELECT AI_TRANSCRIBE(TO_FILE('@financial_consultation', 'consultation_3_sp.wav'),
    {'timestamp_granularity': 'word'});

响应：

Note

为简洁起见，输出被截断。完整输出包含音频文件中每个单词的片段。

{
    "audio_duration": 150.66,
    "segments": [
        {
            "end": 1.513,
            "start": 0.031,
            "text": "«Buenos"
        },
        {
            "end": 2.034,
            "start": 1.553,
            "text": "días,"
        },
        {
            "end": 2.334,
            "start": 2.054,
            "text": "doña"
        },
        {
            "end": 4.457,
            "start": 2.374,
            "text": "Esperanza."
        },
        {
            "end": 4.597,
            "start": 4.477,
            "text": "¿En"
        },
        {
            "end": 4.857,
            "start": 4.697,
            "text": "qué"
        },
        {
            "end": 5.118,
            "start": 4.917,
            "text": "puedo"
        },
        {
            "end": 5.518,
            "start": 5.178,
            "text": "ayudarla"
        },
        {
            "end": 6.5,
            "start": 5.578,
            "text": "hoy?»"
        },

        ...

        {
            "end": 146.671,
            "start": 146.551,
            "text": "Ya"
        },
        {
            "end": 147.234,
            "start": 146.732,
            "text": "veremos,"
        },
        {
            "end": 147.837,
            "start": 147.355,
            "text": "Roberto."
        },
        {
            "end": 148.581,
            "start": 148.078,
            "text": "Gracias"
        },
        {
            "end": 148.822,
            "start": 148.661,
            "text": "por"
        },
        {
            "end": 149.646,
            "start": 148.902,
            "text": "tu"
        },
        {
            "end": 150.711,
            "start": 150.249,
            "text": "ayuda."
        }
    ],
    "text": "«Buenos días, doña Esperanza. ¿En qué puedo ayudarla hoy?» «Roberto, quiero
    hacer un cambio grande en mi portafolio. Quiero vender todo y compra solo acciones
    de Tesla». «¿Tesla? Doña Esperanza, usted tiene 72 años. ¿Por qué quiere poner todo
    su dinero en una sola compañía?» «¿Por qué Tesla va a ser el futuro?» Un minuto me
    explico que van a dominar los carros eléctricos. Dice que puedo triplicar mi dinero
    en dos años. Entiendo que Tesla es una impresión innovador, pero poner todos sus
    ajuros en una sola acción es muy arriesgado. ¿Qué pasa si Tesla baja? No va a bajar.
    Elon Musk es un genio. Además, mi vecina compró Teslas. Teslas es tres años. Y Aorus
    tiene el doble de dinero. Doña Esperanza, su vecina tuvo suerte, pero las yantes
    individuales pueden ser muy volátiles. Usted necesita dinero estable para sus gastos
    de retiro. Roberto, tengo $400,000 en mi cuenta. Si te la sube como dismi, voy a
    tener más de un año. Podré dejarle más dinero a mi familia. Pero también podría
    perder la mitad de su dinero o más. Te sabía Jairo 60% antes. No puedo recomendarle
    que haga esto. Entonces no me dejas escuchando. Yo sé lo que quiero hacer con mi
    dinero. Es mi decisión. Tienes razón, es su dinero. Pero como su asesor tengo que
    decir que esto es extremamanda peligroso para alguien de su edad. Eva, no importa.
    Quiero tomar este riesgo. Vas a Edom o no. Doña Esperanza, ¿qué tal si compramos
    algo de Tesla perronoto? ¿Podríamos poner 10% en Tesla y el resto en versiones más
    seguras? No, Roberto, quiero el 100% en Tesla. Si no me ayudas, voy a alcanzar otro
    asesor. Que sí lo haga. Está bien, Doña Presanza. Voy a procesar la orden, pero voy
    a documentar que fue contra mi recomendación profesional. Perfecto. Hazlo hoy mismo.
    Quiero compra antes que suba más. Será ahora. Él considera lo que le estoy diciendo.
    Esto puede ser ver muy mal a la vida. Ya veremos, Roberto. Gracias por tu ayuda."
}

说话者识别

Set timestamp granularity to “speaker” to detect, separate, and identify unique speakers in conversations or meetings. This example uses an audio file an audio file with two speakers, one speaking English and the other Spanish.

SELECT AI_TRANSCRIBE(TO_FILE('@financial_consultation', 'consultation_5_mix_es_en.wav'),
    {'timestamp_granularity': 'speaker'});

响应：

Note

为简洁起见，输出被截断。完整输出包含音频文件中每个对话“回合”的片段。

{
    "audio_duration": 208.66,
    "segments": [
        {
            "end": 3.076,
            "speaker_label": "SPEAKER_00",
            "start": 0.031,
            "text": "Good afternoon, this is Aaliyah Johnson from Secure Financial Services."
        },
        {
            "end": 4.297,
            "speaker_label": "SPEAKER_02",
            "start": 3.196,
            "text": "How can I help you today?"
        },
        {
            "end": 7.182,
            "speaker_label": "SPEAKER_02",
            "start": 5.139,
            "text": "Hola, necesito ayuda con mis inversiones."
        },
        {
            "end": 11.528,
            "speaker_label": "SPEAKER_02",
            "start": 7.482,
            "text": "Estoy muy preocupada porque he perdido mucho dinero y no sé qué hacer."
        },
        {
            "end": 14.132,
            "speaker_label": "SPEAKER_02",
            "start": 12.289,
            "text": "I'm sorry, I'm not understanding."
        },
        {
            "end": 15.795,
            "speaker_label": "SPEAKER_02",
            "start": 14.553,
            "text": "Do you speak English?"
        },
        ...
        {
            "end": 189.169,
            "speaker_label": "SPEAKER_02",
            "start": 185.841,
            "text": "Es muy difícil entender estas cosas en inglés."
        },
        {
            "end": 192.326,
            "speaker_label": "SPEAKER_01",
            "start": 190.178,
            "text": "Por supuesto, señora Ramírez."
        },
        {
            "end": 197.145,
            "speaker_label": "SPEAKER_01",
            "start": 192.788,
            "text": "Es muy importante que entienda completamente sus opciones."
        },
        {
            "end": 203.229,
            "speaker_label": "SPEAKER_01",
            "start": 197.165,
            "text": "Voy a hacer los cambios hoy mismo y la llamaré la próxima semana para ver cómo se siente."
        },
        {
            "end": 205.759,
            "speaker_label": "SPEAKER_02",
            "start": 203.891,
            "text": "Muchísimas gracias, María."
        },
        {
            "end": 208.71,
            "speaker_label": "SPEAKER_02",
            "start": 206.18,
            "text": "Me siento mucho más tranquila ahora."
        }
    ],
    "text": "Good afternoon, this is Aaliyah Johnson from Secure Financial Services.
    How can I help you today? Hola, necesito ayuda con mis inversiones. Estoy muy
    preocupada porque he perdido mucho dinero y no sé qué hacer. I'm sorry, I'm not
    understanding. Do you speak English? Un poquito, pero es muy difícil para mí. Aquí
    hay alguien que habla español, ¿ok? Es muy importante. He perdido miles de dólares.
    I'm really sorry, but I don't speak Spanish. Let me see. I think we might have
    someone who speaks Spanish, but they're not available right now. ¿Cuándo pueden
    ayudarme? Necesito hablar con a lguien hoy. Mi esposo está muy enojado y quiere que
    vendamos todo. I understand you need someone who speaks Spanish. Let me check if
    Maria is available. She's our Spanish-speaking advisor. Can you hold for just a
    moment? No entiendo. Mañana. Pero necesito ayuda ahora. ¿No hay nadie más? I am
    going to transfer you to Maria right now. She'll be able to help you with your
    investment concerns. Hola, soy María González. Entiendo que necesita ayuda con sus
    inversiones. ¿Cómo está usted? ¡Ay, qué alivio! Sí, estoy muy preocupada. He
    perdido casi 20.000 dólares en las últimas semanas y mi esposo quiere que vendamos
    todo. Comprendo perfectamente su preocupación, señora Ramírez. Perder dinero es muy
    estresante. Cuénteme un poco más sobre su situación. ¿Qué tipo de inversiones
    tiene? Tengo fondos mutuos y algunas acciones. Todo está bajando mucho. Mi esposo
    dice que es mejor tener el dinero en el banco, pero yo no estoy segura. Es natural
    sentirse nerviosa cuando el mercado está volátil. Pero antes de tomar decisiones
    importantes, vamos a revisar su situación completa. ¿Cuántos años tiene usted y
    cuándo planea retirarse? Tengo 55 años y quiero retirarme a los 65, pero con estas
    pérdidas no sé si voy a poder. Señora Ramírez, usted todavía tiene 10 años hasta el
    retiro. Eso es tiempo suficiente para que sus inversiones se recuperen. El mercado
    siempre tiene altibajos, pero históricamente se ha recuperado. ¿Pero qué pasa si no
    se recupera esta vez? No puedo perder más dinero. Entiendo su miedo. ¿Qué le parece
    si hacemos algunos ajustes para que se sienta más cómoda? Podemos mover parte de su
    dinero a inversiones más conservadoras, como bonos. Eso suena mejor. No quiero
    arriesgar todo, pero tampoco quiero perder la oportunidad de crecer mi dinero.
    Perfecto. Vamos a encontrar un equilibrio. ¿Qué tal si movemos el 40% de sus
    acciones a bonos? Así tendrá menos riesgo, pero todavía podrá crecer su dinero para
    el retiro. Sí, eso me hace sentir mucho mejor. Gracias por explicarme todo en
    español. Es muy difícil entender estas cosas en inglés. Por supuesto, señora
    Ramírez. Es muy importante que entienda completamente sus opciones. Voy a hacer los
    cambios hoy mismo y la llamaré la próxima semana para ver cómo se siente. Muchísimas
    gracias, María. Me siento mucho más tranquila ahora."
}

Use with other AI Functions

Call transcript analysis

You can pass the output of AI_TRANSCRIBE to other AI Functions for further processing. For example, you can use AI_SUMMARIZE to summarize the transcription, or AI_CLASSIFY to classify the content of the transcription. This example uses AI_SENTIMENT and AI_COMPLETE to analyze the text transcribed from customer call audio and provide sentiment on four dimensions and an assessment of the agent.

Note

AI_SENTIMENT 仅分析文本，不考虑语气等语音特征。

WITH transcriptions AS
    ( SELECT TO_VARCHAR (AI_TRANSCRIBE(TO_FILE('@financial_consultation',
        'consultation_1.wav'))) AS transcribed_call )
SELECT
    AI_SENTIMENT(transcribed_call, ['Professionalism', 'Resolution',
        'Wait Time', 'Market Conditions']) AS call_sentiment,
    AI_COMPLETE ('claude-4-opus', CONCAT ('Summarize how the agent can improve in 50 words',
        transcribed_call)) AS agent_assessment
FROM transcriptions

AI_SENTIMENT 响应：

{
    "categories": [
        {
            "name": "overall",
            "sentiment": "negative"
        },
        {
            "name": "Market Conditions",
            "sentiment": "negative"
        },
        {
            "name": "Professionalism",
            "sentiment": "negative"
        },
        {
            "name": "Resolution",
            "sentiment": "negative"
        },
        {
            "name": "Wait Time",
            "sentiment": "unknown"
        }
    ]
}

AI_COMPLETE 响应：

"The agent needs significant improvement in empathy, active listening, and client-centered communication. Instead of
dismissing concerns and using condescending language, they should validate emotions, explain market conditions
professionally, present multiple options, and guide clients through informed decision-making while respecting their
risk tolerance and personal circumstances."

Video transcript analysis

The following example transcribes a video file stored in the podcast_videos_S3 stage,

SELECT AI_TRANSCRIBE(TO_FILE( '@podcast_videos_S3', 'podcast-interview.mp4'));

响应：

{
"audio_duration": 5423.744,
"text": "Welcome to the New York Times Popcast, your deepest duende of music news and criticism. I'm John Caramonica, and I'm the critic. I'm Joe Cascarelli, and I'm the reporter. I'm Rosalía and I'm here today with you guys. Yes. Thank you so much for being here. Like literally on some days, Jo. Some days. On some days, I think, is this person the only good pop star?
...
Thank you for being here. Loved. Every episode of Popcast is at nytimes.com slash popcast. We're on YouTube at Popcast. Subscribe. We're on Instagram and TikTok at Popcast. Tap that like. Tap that follow. Tap in. Don't tap out. Credits and links and bio. We'll be back next week. Yes. Invite me anytime to eat more snacks, please. I lost my hands in Jerez"
}

Once you have the transcript, you can use AI_COMPLETE to perform additional analysis. This example identifies retail brands mentioned in the conversation for use in advertising or sponsorship analytics.

SELECT
  AI_COMPLETE('claude-sonnet-4-5',
    PROMPT('Return a list of any Retail Brands mentioned in this podcast {0}',
      TO_VARCHAR(transcription_results))) as brands_identified
FROM podcast_video_transcription;

Response

Retail Brands Mentioned in Podcast

Based on the transcript analysis, the following brands were identified:

Calvin Klein — Mentioned in relation to Rosalía’s commercial appearance
Kinder Bueno — Cited as one of Rosalía’s favorite snacks.
Nutella — Referenced as a preferred treat.
Nestlé — Mentioned as the manufacturer of Milky Bar ice cream bites.
Nongshim — Korean snack brand discussed during the tasting segment.
Cap'n Crunch — Referenced for its scent similarity to Korean snacks.
Doritos — Mentioned by one of the hosts while discussing snack collections.

成本注意事项

Billing for all AI Functions is based on token consumption. For transcription, each second of audio processed is 50 tokens, regardless of language or segmentation method. A full hour of audio is therefore 180,000 tokens. Assuming that processing a million tokens costs 1.3 credits, and that Snowflake credits cost US $3 each, each hour of audio processed costs about US $0.702. This estimate is subject to change. For current pricing information, see the Snowflake Service Consumption Table.

Note

AI_TRANSCRIBE 最低计费时长为 1 分钟。少于 1 分钟的文件仍会被处理，但按照 1 分钟计费。要高效地处理大量的短音频文件，可以考虑将它们批处理成一个文件，并使用时间戳来标识生成的转录中每个原始文件的开头和结尾。