function async returnBufferFromS3(params: { key: string }) {
      const data = await this.awsS3.send(new GetObjectCommand({
        Bucket: 'some-bucket'
        , Key: params.key
      }));

      const stream = data.Body as Readable;

      return new Promise<Buffer>((resolve, reject) => {
        const chunks: Buffer[] = [];
        stream.on('data', (chunk) => chunks.push(chunk));
        stream.on('error', (error) => reject(error));
        stream.on('end', () => resolve(Buffer.concat(chunks)));
      });
}

import { returnBufferFromS3 } from "s3.service";
import { isUploadable } from "openai/uploads";
...

const openAI = new OpenAI({
  apiKey: 'some-api-key',
  organization: 'some-org-id'
});

function async returnTranscriptionsBasedOnKey(key: string) {
      const buffer = await returnBufferFromS3({ key: 'some-key; });
      const tmp = new Blob([buffer], { type: `test.mp4` });
      const fileLikeBlob = return Object.assign(blob, {
          name: 'test.mp4'
          , lastModified: new Date().getTime()
     });

      if (!isUploadable(fileLikeBlob)) {
        throw new Error(`Unable to upload file to OpenAI due to the following not being uploadable: ${fileLikeBlob}`);
      }

      const openAIResponse = await openAI.audio.transcriptions.create({
        file: fileLikeBlob,
        model: 'whisper-1'
      }

      return openAIResponse;
}