@Test
    public void testAmazonTranscribeVideo_enUS() throws Exception {
        String expected = "Hi";
        ParseContext context = new ParseContext();
        context.set(LanguageCode.class, LanguageCode.EN_US);
        String xml = getXML("en-US_(Hi).mp4", PARSER, context).xml;
        assertContains(expected, xml);
    }
Tests transcribe with an audio file given the source language
The source language of the file is en-US (English - United States)
tika-parsers/tika-parsers-ml/tika-transcribe-aws/src/test/java/org/apache/tika/parser/transcribe/aws/AmazonTranscribeTest.java