Media download - stop inferring filename from info.json, use --print template instead

packages/cdk/lib/transcription-service.ts

@@ -789,7 +789,7 @@ export class TranscriptionService extends GuStack {
 		mediaDownloadTask.taskDefinition.addVolume(tempVolume);
 		mediaDownloadTask.containerDefinition.addMountPoints({
 			sourceVolume: downloadVolume.name,
-			containerPath: '/media-download', // needs to match DOWNLOAD_DIRECTORY in media-download index.ts
+			containerPath: '/media-download', // needs to match ECS_MEDIA_DOWNLOAD_WORKING_DIRECTORY in media-download index.ts
 			readOnly: false,
 		});
 		mediaDownloadTask.containerDefinition.addMountPoints({

packages/media-download/src/index.ts

@@ -20,7 +20,8 @@ import {
 	MediaDownloadJob,
 } from '@guardian/transcription-service-common';
 
-export const MEDIA_DOWNLOAD_WORKING_DIRECTORY = '/media-download';
+// This needs to be kept in sync with CDK downloadVolume
+export const ECS_MEDIA_DOWNLOAD_WORKING_DIRECTORY = '/media-download';
 
 const uploadToS3 = async (
 	s3Client: S3Client,
@@ -138,17 +139,21 @@ const main = async () => {
 	const useProxy =
 		config.app.stage !== 'DEV' || process.env['USE_PROXY'] === 'true';
 
+	const workingDirectory =
+		config.app.stage === 'DEV' ? '/tmp' : ECS_MEDIA_DOWNLOAD_WORKING_DIRECTORY;
+
 	const proxyUrl = useProxy
 		? await startProxyTunnel(
 				await config.app.mediaDownloadProxySSHKey(),
 				config.app.mediaDownloadProxyIpAddress,
 				config.app.mediaDownloadProxyPort,
+				workingDirectory,
 			)
 		: undefined;
 
 	const metadata = await downloadMedia(
 		job.url,
-		MEDIA_DOWNLOAD_WORKING_DIRECTORY,
+		workingDirectory,
 		job.id,
 		proxyUrl,
 	);

packages/media-download/src/yt-dlp.ts

@@ -1,24 +1,24 @@
 import fs from 'node:fs';
 import { runSpawnCommand } from '@guardian/transcription-service-backend-common/src/process';
 import { logger } from '@guardian/transcription-service-backend-common';
-import { MEDIA_DOWNLOAD_WORKING_DIRECTORY } from './index';
 
 export type MediaMetadata = {
 	title: string;
 	extension: string;
-	filename: string;
 	mediaPath: string;
 	duration: number;
 };
 
-const extractInfoJson = (infoJsonPath: string): MediaMetadata => {
+const extractInfoJson = (
+	infoJsonPath: string,
+	outputFilePath: string,
+): MediaMetadata => {
 	const file = fs.readFileSync(infoJsonPath, 'utf8');
 	const json = JSON.parse(file);
 	return {
 		title: json.title,
-		extension: json.ext,
-		filename: json.filename,
-		mediaPath: `${json.filename}`,
+		extension: json.ext || json.entries[0]?.ext,
+		mediaPath: outputFilePath,
 		duration: parseInt(json.duration),
 	};
 };
@@ -27,13 +27,12 @@ export const startProxyTunnel = async (
 	key: string,
 	ip: string,
 	port: number,
+	workingDirectory: string,
 ): Promise<string> => {
 	try {
-		fs.writeFileSync(
-			`${MEDIA_DOWNLOAD_WORKING_DIRECTORY}/media_download`,
-			key + '\n',
-			{ mode: 0o600 },
-		);
+		fs.writeFileSync(`${workingDirectory}/media_download`, key + '\n', {
+			mode: 0o600,
+		});
 		const result = await runSpawnCommand(
 			'startProxyTunnel',
 			'ssh',
@@ -49,7 +48,7 @@ export const startProxyTunnel = async (
 				'-N',
 				'-f',
 				'-i',
-				`${MEDIA_DOWNLOAD_WORKING_DIRECTORY}/media_download`,
+				`${workingDirectory}/media_download`,
 				`media_download@${ip}`,
 			],
 			true,
@@ -64,28 +63,39 @@ export const startProxyTunnel = async (
 
 export const downloadMedia = async (
 	url: string,
-	destinationDirectoryPath: string,
+	workingDirectory: string,
 	id: string,
 	proxyUrl?: string,
 ) => {
 	const proxyParams = proxyUrl ? ['--proxy', proxyUrl] : [];
 	try {
+		const filepathLocation = `${workingDirectory}/${id}.txt`;
+		// yt-dlp --print-to-file appends to the file, so wipe it first
+		fs.writeFileSync(filepathLocation, '');
 		await runSpawnCommand(
 			'downloadMedia',
 			'yt-dlp',
 			[
 				'--write-info-json',
 				'--no-clean-info-json',
+				'--print-to-file',
+				'after_move:filepath',
+				`${filepathLocation}`,
 				'--newline',
 				'-o',
-				`${destinationDirectoryPath}/${id}.%(ext)s`,
+				`${workingDirectory}/${id}.%(ext)s`,
 				...proxyParams,
 				url,
 			],
 			true,
 		);
+		const outputPath = fs.readFileSync(filepathLocation, 'utf8').trim();
 		const metadata = extractInfoJson(
-			`${destinationDirectoryPath}/${id}.info.json`,
+			`${workingDirectory}/${id}.info.json`,
+			outputPath,
+		);
+		logger.info(
+			`Download complete, extracted metadata: ${JSON.stringify(metadata)}`,
 		);
 
 		return metadata;

scripts/trigger-media-download-service.sh

@@ -8,5 +8,5 @@ if [ -z "$URL" ] || [ -z "$USER_EMAIL" ]; then
   exit 1
 fi
 
-export MESSAGE_BODY="{\"id\":\"a168f62d-e179-46d5-9a9e-ff519551e0ee\",\"url\":\"${URL}\",\"languageCode\":\"en\",\"translationRequested\":false,\"userEmail\":\"${USER_EMAIL}\"}"
-npm run media-download::start
+export MESSAGE_BODY="{\"id\":\"a168f62d-e179-46d5-9a9e-ff519551e0ee\",\"url\":\"${URL}\",\"languageCode\":\"en\",\"translationRequested\":false,\"diarizationRequested\":false,\"userEmail\":\"${USER_EMAIL}\"}"
+npm run media-download::start