Use Google Speech API to transcribe recordings in your Evernote Notes: https://piszek.com/2020/05/27/evernote-transcriber/

transcribe_audio_file_in_an_evernote_note.php

<?php
// https://piszek.com/2020/05/27/evernote-transcriber/

function transcribe_audio_file_in_a_note( $evernoteClient, $note ) {
	// This will find the place where file is embedded, so we can display the transcription underneath.
	if( preg_match( '#<en-media hash="([a-z0-9]+)"[^>]+>#is', $note->content, $res ) ) {
		$id = hex2bin($res[1] );
		$resources = array_filter( $note->resources, function( $resource ) use ( $id ) {
			return $resource->data->bodyHash === $id;
		}  );
		if( $resources ) {
			$resource = array_shift( $resources );
		}
	}
	if ( isset( $resource->mime ) && $resource->mime === 'audio/x-m4a' ) {
		// Only audio files
		if ( isset( $resource->attributes->applicationData->keysOnly['transcribed'] ) ) {
			$this->log( LOG_INFO, 'This resource is already transcribed.' );
			return;
		}
		// Set for the future
		$evernoteClient->client->getNoteStore()->setResourceApplicationDataEntry( $resource->guid, 'transcribed', 'true' );
		// this is your Google Speech API token
		$token = "tsrtrastr8astars8tras8t";
		$in = tempnam(sys_get_temp_dir(), 'evernote_transcript') . '.mp4';
		$out = tempnam(sys_get_temp_dir(), 'evernote_transcript') . '.wav';
		$data = $evernoteClient->client->getNoteStore()->getResourceData( $resource->guid );
		file_put_contents( $in, $data );
		// Because Google Speech API is crap and cannot deal with other formats, we have to recode it.
		system( "ffmpeg -i $in $out" );
		$data = file_get_contents( $out );

		$payload = array(
			"audio" => array( "content" => base64_encode( $data ) ),
			"config" => array(
				"languageCode" => "en-US",
				"alternativeLanguageCodes" => [ "pl-PL" ], // I only use English or Polish. Your mileage may vary.
				"encoding" => "LINEAR16",
				"sampleRateHertz" => 44100,
				"maxAlternatives" => 1,
				"enableAutomaticPunctuation" => true
			)
		);
		$payload = json_encode( $payload );
		$context  = stream_context_create( array(
			'http' => array(
				'ignore_errors' => true,
				'header' => "Content-Type: application/json\r\n",
				'method'  => 'POST',
				'content' => $payload
			)
		) );
		// Wondering about the v1p1beta1 here? You have to use this version to have alternativeLanguageCodes. This of course is not in documentation.
		$result = file_get_contents( "https://speech.googleapis.com/v1p1beta1/speech:recognize?fields=results&key=$token", false, $context );
		$result = json_decode( $result, true );
		if ( ! isset ( $result['results'][0]['alternatives'][0]['transcript'] ) ) {
			$this->log( LOG_WARNING, 'Empty transcript. ' . print_r( $result, true ) );
			return;
		}
		$text = $result['results'][0]['alternatives'][0]['transcript'];
		$this->log( LOG_INFO, 'Transcript OK: ' . $text );

		$new_body = str_replace( $res[0], $res[0] . "<div style='font-style: italic'>$text</div>",$note->content );
		$note->content = $new_body;
		$evernoteClient->client->getNoteStore()->updateNote( $note );
	}
	return $note->content;
}