Aws Transribe unable to start_transcription_job without LanguageCode in boto3

[kenchoong]

Please fill out the sections below to help us address your issue.

What issue did you see ?
Boto3 version 1.16.5
Service is Aws Transcribe

I unable to use start_transcription_job without LanguageCode parameter and using IdentifyLanguage=True

Read the docs of boto3 and Aws Transcribe multiple times stated that LanguageCode is optional and IdentifyLanguage is valid parameter. But still make it work, I not sure why.

Steps to reproduce
First install boto3 in local using pip install boto3

Inside my lambda function:

import boto3
import json

def TranscribeSoundToWordHandler(event, context):
    mediaFileUri = 's3://'+ bucket_name+'/'+prefixKey

    transcribe_client = boto3.client('transcribe')
    response = response = transcribe_client.start_transcription_job(
        TranscriptionJobName='Test-20201-27',
        IdentifyLanguage=True,
        Media={'MediaFileUri':mediaFileUri}
    )

Then I test it locally:

sam local invoke TranscribeSoundToWordHandler --event lambda\MyDirectory\event.json

I also write out a question here

Debug logs
Full stack trace by adding boto3.set_stream_logger('') to your code.

[ERROR] ParamValidationError: Parameter validation failed:
Missing required parameter in input: "LanguageCode"
Unknown parameter in input: "IdentifyLanguage", must be one of: TranscriptionJobName, LanguageCode, MediaSampleRateHertz, MediaFormat, Media, OutputBucketName, OutputEncryptionKMSKeyId, Settings, JobExecutionSettings, ContentRedaction
Traceback (most recent call last):
  File "/var/task/app.py", line 24, in TranscribeSoundToWordHandler
    response = response = transcribe_client.start_transcription_job(
  File "/var/runtime/botocore/client.py", line 316, in _api_call
    return self._make_api_call(operation_name, kwargs)
  File "/var/runtime/botocore/client.py", line 607, in _make_api_call
    request_dict = self._convert_to_request_dict(
  File "/var/runtime/botocore/client.py", line 655, in _convert_to_request_dict
    request_dict = self._serializer.serialize_to_request(
  File "/var/runtime/botocore/validate.py", line 297, in serialize_to_request
    raise ParamValidationError(report=report.generate_report())

[swetashre]

@kenchoong - Thank you for your post. I am not able to reproduce the issue. Which version of boto3/botocore are you using ?
Can you try with latest version of boto3 ?

[kenchoong]

Hey miss, I using

boto version 1.16.5
botocore version: 1.19.5

[kenchoong]

My current directory is look like this:

But I create the Lambda using cdk, but I cant run the lambda locally using SAM

[swetashre]

@kenchoong - Please make sure your lambda function is using botocore version >=1.17.62. This error occurs if you are using older version of SDK.