Sample code for uploading video and subtitles using TwitterAPIKit.

DeleteSubtitle.swift

// Delete subtitle

let exp = expectation(description: "")
client.v1.media.deleteSubtitle(.init(mediaID: "<media id>", mediaCategory: "TweetVideo", subtitleLanguageCodes: ["en"])).responseData { response in
    print(response.prettyString)
    exp.fulfill()
}

wait(for: [exp], timeout: 100)

UploadVideoWithSubtitle.swift

// https://github.com/mironal/TwitterAPIKit

// XCTest

func testUploadVideoWithSutitle() throws {


    let client = TwitterAPIKit(
        consumerKey: "",
        consumerSecret: "",
        oauthToken: "",
        oauthTokenSecret: ""
    )

    let srt = """
1
00:00:00,000 --> 00:00:05,000
Hello Hello

2
00:00:05,000 --> 00:00:07,000
Hoge Hoge

"""

    let exp = expectation(description: "")

    let data = try Data(contentsOf: URL(fileURLWithPath: "path/to/video.mp4"))

    client.v1.media.uploadMedia(.init(media: data, mediaType: "video/mp4", filename: "video.mp4", mediaCategory: "TWEET_VIDEO")) { response in
        print(response.prettyString)

        guard let mediaID = response.success else {
            XCTFail()
            exp.fulfill()
            return
        }

        client.v1.media.uploadMedia(.init(media: srt.data(using: .utf8)!, mediaType: "text/plain", filename: "hoge.str", mediaCategory: "SUBTITLES")) { response in

            guard let subtitleMediaID = response.success else {
                XCTFail()
                exp.fulfill()
                return
            }

            client.v1.media.createSubtitle(.init(mediaID: mediaID, mediaCategory: "tweet_video", subtitles: [.init(mediaID: subtitleMediaID, languageCode: "en", displayName: "English")])).responseData { response in

                print(response.prettyString)

                if response.isError {
                    XCTFail()
                    exp.fulfill()
                    return
                }

                client.v1.tweet.postUpdateStatus(.init(status: "Subtitle Text", mediaIDs: [mediaID])).responseObject { response in
                    print(response.prettyString)

                    exp.fulfill()
                }
            }
        }
    }
    wait(for: [exp], timeout: 100)
}