始める前に

このページでは、Google Cloud プロジェクトを設定し、そのプロジェクトにアクセスするようにサービス アカウントを構成する方法について説明します。

Google Cloud プロジェクトの設定

次の手順に沿って、Google Cloud プロジェクトを設定します。CDN を使用してコンテンツを配信する予定がない場合は、（動画スティッチャー管理者のロールではなく）動画スティッチャー ユーザーのロールのみをサービス アカウントに付与する必要があります。

1. Sign in to your Google Cloud account. If you're new to Google Cloud, create an account to evaluate how our products perform in real-world scenarios. New customers also get $300 in free credits to run, test, and deploy workloads.

2. In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

   Note: If you don't plan to keep the resources that you create in this procedure, create a project instead of selecting an existing project. After you finish these steps, you can delete the project, removing all resources associated with the project.

   Go to project selector

3. Make sure that billing is enabled for your Google Cloud project.

4. Enable the Video Stitcher API.

   Enable the API

5. Create a service account:

   1. In the Google Cloud console, go to the Create service account page.

      Go to Create service account
   2. Select your project.

   3. In the Service account name field, enter a name. The Google Cloud console fills in the Service account ID field based on this name.

      In the Service account description field, enter a description. For example, Service account for quickstart.

   4. Click Create and continue.

   5. Grant the Video Stitcher Admin role to the service account.

      To grant the role, find the Select a role list, then select Video Stitcher Admin.

      Note: The Role field affects which resources the service account can access in your project. You can revoke these roles or grant additional roles later.
   6. Click Continue.

   7. Click Done to finish creating the service account.

      Do not close your browser window. You will use it in the next step.

6. Create a service account key:

   1. In the Google Cloud console, click the email address for the service account that you created.
   2. Click Keys.
   3. Click Add key, and then click Create new key.
   4. Click Create. A JSON key file is downloaded to your computer.
   5. Click Close.

7. Set the environment variable GOOGLE_APPLICATION_CREDENTIALS to the path of the JSON file that contains your credentials. This variable applies only to your current shell session, so if you open a new session, set the variable again.

   Example: Linux or macOS

   export GOOGLE_APPLICATION_CREDENTIALS="KEY_PATH"

   Replace KEY_PATH with the path of the JSON file that contains your credentials.

   For example:

   export GOOGLE_APPLICATION_CREDENTIALS="/home/user/Downloads/service-account-file.json"

   Example: Windows

   For PowerShell:

   $env:GOOGLE_APPLICATION_CREDENTIALS="KEY_PATH"

   Replace KEY_PATH with the path of the JSON file that contains your credentials.

   For example:

   $env:GOOGLE_APPLICATION_CREDENTIALS="C:\Users\username\Downloads\service-account-file.json"

   For command prompt:

   set GOOGLE_APPLICATION_CREDENTIALS=KEY_PATH

   Replace KEY_PATH with the path of the JSON file that contains your credentials.

8. In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

   Note: If you don't plan to keep the resources that you create in this procedure, create a project instead of selecting an existing project. After you finish these steps, you can delete the project, removing all resources associated with the project.

   Go to project selector

9. Make sure that billing is enabled for your Google Cloud project.

10. Enable the Video Stitcher API.

    Enable the API

11. Create a service account:

    1. In the Google Cloud console, go to the Create service account page.

       Go to Create service account
    2. Select your project.

    3. In the Service account name field, enter a name. The Google Cloud console fills in the Service account ID field based on this name.

       In the Service account description field, enter a description. For example, Service account for quickstart.

    4. Click Create and continue.

    5. Grant the Video Stitcher Admin role to the service account.

       To grant the role, find the Select a role list, then select Video Stitcher Admin.

       Note: The Role field affects which resources the service account can access in your project. You can revoke these roles or grant additional roles later.
    6. Click Continue.

    7. Click Done to finish creating the service account.

       Do not close your browser window. You will use it in the next step.

12. Create a service account key:

    1. In the Google Cloud console, click the email address for the service account that you created.
    2. Click Keys.
    3. Click Add key, and then click Create new key.
    4. Click Create. A JSON key file is downloaded to your computer.
    5. Click Close.

13. Set the environment variable GOOGLE_APPLICATION_CREDENTIALS to the path of the JSON file that contains your credentials. This variable applies only to your current shell session, so if you open a new session, set the variable again.

    Example: Linux or macOS

    export GOOGLE_APPLICATION_CREDENTIALS="KEY_PATH"

    Replace KEY_PATH with the path of the JSON file that contains your credentials.

    For example:

    export GOOGLE_APPLICATION_CREDENTIALS="/home/user/Downloads/service-account-file.json"

    Example: Windows

    For PowerShell:

    $env:GOOGLE_APPLICATION_CREDENTIALS="KEY_PATH"

    Replace KEY_PATH with the path of the JSON file that contains your credentials.

    For example:

    $env:GOOGLE_APPLICATION_CREDENTIALS="C:\Users\username\Downloads\service-account-file.json"

    For command prompt:

    set GOOGLE_APPLICATION_CREDENTIALS=KEY_PATH

    Replace KEY_PATH with the path of the JSON file that contains your credentials.

14. Install the Google Cloud CLI.

15. To initialize the gcloud CLI, run the following command:

    gcloud init

    Note: You can run the gcloud CLI in the Google Cloud console without installing the Google Cloud CLI. To run the gcloud CLI in the Google Cloud console, use Cloud Shell.
16. gcloud ツールを使用して認証環境をテストします。次のコマンドが、エラーなしでテキスト文字列を出力することを確認します。

    gcloud auth application-default print-access-token

サービス アカウントを有効にする

1. ターミナルで、gcloud コマンドが有効なプロジェクトを設定します。YOUR_PROJECT_ID は、実際のプロジェクト ID に置き換えます。

   gcloud config set project YOUR_PROJECT_ID
   

2. サービス アカウントを有効にします。PATH_TO_YOUR_SERVICE_KEY は、ローカルマシンにダウンロードした JSON ファイルのパスに置き換えます。

   gcloud auth activate-service-account --key-file PATH_TO_YOUR_SERVICE_KEY
   

このサービス アカウントを使用してアクセスを承認し、動画スティッチャー API を呼び出します。

セッション作成権限のみを持つサービス アカウントを作成する

OAuth トークンはクライアント アプリケーションに渡されるため、セッションを作成する権限のみを持つサービス アカウントを個別に作成します。これにより、OAuth トークンが漏洩しても、リソース（CDN 鍵など）が不正にアクセスされることはなくなります。

Create a service account:

1. In the Google Cloud console, go to the Create service account page.

   Go to Create service account
2. Select your project.

3. In the Service account name field, enter a name. The Google Cloud console fills in the Service account ID field based on this name.

   In the Service account description field, enter a description. For example, Service account for quickstart.

4. Click Create and continue.

5. Grant the Video Stitcher User role to the service account.

   To grant the role, find the Select a role list, then select Video Stitcher User.

   Note: The Role field affects which resources the service account can access in your project. You can revoke these roles or grant additional roles later.
6. Click Continue.

7. Click Done to finish creating the service account.

   Do not close your browser window. You will use it in the next step.

Create a service account key:

1. In the Google Cloud console, click the email address for the service account that you created.
2. Click Keys.
3. Click Add key, and then click Create new key.
4. Click Create. A JSON key file is downloaded to your computer.
5. Click Close.

VOD ソースファイルを作成する

このワークフローでは、MPEG-DASH マニフェスト（MPD）ファイルまたは HTTP Live Streaming（HLS）マニフェスト（M3U8）ファイルと、関連するセグメント ファイルが必要です。既存の VOD ファイルを使用することも、Transcoder API を使用して VOD ソースファイルを作成することもできます。