api/tiktok: add support for subtitles

api/src/processing/match-action.js

@@ -169,9 +169,14 @@ export default function({
                     }
                     break;
 
+                case "tiktok":
+                    params = {
+                        type: r.subtitles ? "remux" : "proxy"
+                    };
+                    break;
+
                 case "ok":
                 case "vk":
-                case "tiktok":
                 case "xiaohongshu":
                     params = { type: "proxy" };
                     break;

api/src/processing/match.js

@@ -150,6 +150,7 @@ export default async function({ host, patternMatch, params, isSession, isApiKey
                     isAudioOnly,
                     h265: params.allowH265,
                     alwaysProxy: params.alwaysProxy,
+                    subtitleLang,
                 });
                 break;
 

api/src/processing/services/tiktok.js

@@ -4,6 +4,7 @@ import { extract, normalizeURL } from "../url.js";
 import { genericUserAgent } from "../../config.js";
 import { updateCookie } from "../cookie/manager.js";
 import { createStream } from "../../stream/manage.js";
+import { convertLanguageCode } from "../../misc/language-codes.js";
 
 const shortDomain = "https://vt.tiktok.com/";
 
@@ -97,8 +98,23 @@ export default async function(obj) {
     }
 
     if (video) {
+        let subtitles, fileMetadata;
+        if (obj.subtitleLang && detail?.video?.subtitleInfos?.length) {
+            const langCode = convertLanguageCode(obj.subtitleLang);
+            const subtitle = detail?.video?.subtitleInfos.find(
+                s => s.LanguageCodeName.startsWith(langCode) && s.Format === "webvtt"
+            )
+            if (subtitle) {
+                subtitles = subtitle.Url;
+                fileMetadata = {
+                    sublanguage: langCode,
+                }
+            }
+        }
         return {
             urls: video,
+            subtitles,
+            fileMetadata,
             filename: videoFilename,
             headers: { cookie }
         }