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# AWS Elemental MediaConvert 使用 适用于 PHP 的 AWS SDK 版本 3 的示例
AWS Elemental MediaConvert 是一种基于文件的视频转码服务，具有广播级功能。您可以使用它来创建用于通过互联网进行广播和 video-on-demand（VOD）交付的资产。有关更多信息，请参阅 [AWS Elemental MediaConvert 《用户指南》](https://docs.aws.amazon.com/mediaconvert/latest/ug/)。
的 PHP API 通过*`AWS.MediaConvert`*客户端类公开。 AWS Elemental MediaConvert 有关更多信息，请参阅《 API 参考》中的 [https://docs.aws.amazon.com/aws-sdk-php/v3/api/api-mediaconvert-2017-08-29.html](https://docs.aws.amazon.com/aws-sdk-php/v3/api/api-mediaconvert-2017-08-29.html)。
## 在中创建和管理转码作业 AWS Elemental MediaConvert
在此示例中，您使用 适用于 PHP 的 AWS SDK 版本 3 调用 AWS Elemental MediaConvert 和创建转码作业。在开始之前，您需要将输入视频上传到为输入存储预配置的 Amazon S3 存储桶。有关支持的输入视频编解码器和容器的列表，请参阅 [AWS Elemental MediaConvert 用户指南](https://docs.aws.amazon.com/mediaconvert/latest/ug/)中的[支持的输入编解码器和容器](https://docs.aws.amazon.com/mediaconvert/latest/ug/reference-codecs-containers-input.html)。
以下示例演示如何：
+ 在中创建转码任务。 AWS Elemental MediaConvert[CreateJob](https://docs.aws.amazon.com/aws-sdk-php/v3/api/api-mediaconvert-2017-08-29.html#createjob)。
+ 取消 AWS Elemental MediaConvert 队列中的转码作业。 [CancelJob](https://docs.aws.amazon.com/aws-sdk-php/v3/api/api-mediaconvert-2017-08-29.html#canceljob)
+ 检索已完成的转码任务的 JSON。 [GetJob](https://docs.aws.amazon.com/aws-sdk-php/v3/api/api-mediaconvert-2017-08-29.html#getjob)
+ 检索最多 20 个最近创建的任务的 JSON 数组。 [ListJobs](https://docs.aws.amazon.com/aws-sdk-php/v3/api/api-mediaconvert-2017-08-29.html#listjobs)
的所有示例代码都可以在[此 适用于 PHP 的 AWS SDK 处找到 GitHub](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/php/example_code)。
### 凭据
在运行示例代码之前，请配置您的 AWS 证书，如中所述[AWS 使用 适用于 PHP 的 AWS SDK 版本 3 进行身份验证](credentials.md)。然后导入 适用于 PHP 的 AWS SDK，如中所述[安装 适用于 PHP 的 AWS SDK 版本 3](getting-started_installation.md)。
要访问 MediaConvert 客户端，请创建一个 IAM 角色来 AWS Elemental MediaConvert 访问您的输入文件和存储输出文件的 Amazon S3 存储桶。有关更多信息，请参阅 [AWS Elemental MediaConvert 用户指南](https://docs.aws.amazon.com/mediaconvert/latest/ug/)中的[设置 IAM 权限](https://docs.aws.amazon.com/mediaconvert/latest/ug/iam-role.html)。
### 创建客户端
适用于 PHP 的 AWS SDK 通过创建 MediaConvert 客户端进行配置，其中包含您的代码所在的区域。在本示例中，区域设置为 us-west-2。
**导入**
```
require 'vendor/autoload.php';
use Aws\Exception\AwsException;
use Aws\MediaConvert\MediaConvertClient;
```
**示例代码**
```
$mediaConvertClient = new MediaConvertClient([
'version' => '2017-08-29',
'region' => 'us-east-2',
'profile' => 'default'
]);
```
### 定义简单的转码任务
创建定义转码任务参数的 JSON。
这些参数有详细说明。您可以使用 [AWS Elemental MediaConvert 控制台](https://console.aws.amazon.com/mediaconvert/home)生成 JSON 作业参数，方法是在控制台中选择您的作业设置，然后选择**作业**部分底部的**显示作业 JSON**。本示例说明了简单作业的 JSON。
**示例代码**
```
$jobSetting = [
"OutputGroups" => [
[
"Name" => "File Group",
"OutputGroupSettings" => [
"Type" => "FILE_GROUP_SETTINGS",
"FileGroupSettings" => [
"Destination" => "s3://OUTPUT_BUCKET_NAME/"
]
],
"Outputs" => [
[
"VideoDescription" => [
"ScalingBehavior" => "DEFAULT",
"TimecodeInsertion" => "DISABLED",
"AntiAlias" => "ENABLED",
"Sharpness" => 50,
"CodecSettings" => [
"Codec" => "H_264",
"H264Settings" => [
"InterlaceMode" => "PROGRESSIVE",
"NumberReferenceFrames" => 3,
"Syntax" => "DEFAULT",
"Softness" => 0,
"GopClosedCadence" => 1,
"GopSize" => 90,
"Slices" => 1,
"GopBReference" => "DISABLED",
"SlowPal" => "DISABLED",
"SpatialAdaptiveQuantization" => "ENABLED",
"TemporalAdaptiveQuantization" => "ENABLED",
"FlickerAdaptiveQuantization" => "DISABLED",
"EntropyEncoding" => "CABAC",
"Bitrate" => 5000000,
"FramerateControl" => "SPECIFIED",
"RateControlMode" => "CBR",
"CodecProfile" => "MAIN",
"Telecine" => "NONE",
"MinIInterval" => 0,
"AdaptiveQuantization" => "HIGH",
"CodecLevel" => "AUTO",
"FieldEncoding" => "PAFF",
"SceneChangeDetect" => "ENABLED",
"QualityTuningLevel" => "SINGLE_PASS",
"FramerateConversionAlgorithm" => "DUPLICATE_DROP",
"UnregisteredSeiTimecode" => "DISABLED",
"GopSizeUnits" => "FRAMES",
"ParControl" => "SPECIFIED",
"NumberBFramesBetweenReferenceFrames" => 2,
"RepeatPps" => "DISABLED",
"FramerateNumerator" => 30,
"FramerateDenominator" => 1,
"ParNumerator" => 1,
"ParDenominator" => 1
]
],
"AfdSignaling" => "NONE",
"DropFrameTimecode" => "ENABLED",
"RespondToAfd" => "NONE",
"ColorMetadata" => "INSERT"
],
"AudioDescriptions" => [
[
"AudioTypeControl" => "FOLLOW_INPUT",
"CodecSettings" => [
"Codec" => "AAC",
"AacSettings" => [
"AudioDescriptionBroadcasterMix" => "NORMAL",
"RateControlMode" => "CBR",
"CodecProfile" => "LC",
"CodingMode" => "CODING_MODE_2_0",
"RawFormat" => "NONE",
"SampleRate" => 48000,
"Specification" => "MPEG4",
"Bitrate" => 64000
]
],
"LanguageCodeControl" => "FOLLOW_INPUT",
"AudioSourceName" => "Audio Selector 1"
]
],
"ContainerSettings" => [
"Container" => "MP4",
"Mp4Settings" => [
"CslgAtom" => "INCLUDE",
"FreeSpaceBox" => "EXCLUDE",
"MoovPlacement" => "PROGRESSIVE_DOWNLOAD"
]
],
"NameModifier" => "_1"
]
]
]
],
"AdAvailOffset" => 0,
"Inputs" => [
[
"AudioSelectors" => [
"Audio Selector 1" => [
"Offset" => 0,
"DefaultSelection" => "NOT_DEFAULT",
"ProgramSelection" => 1,
"SelectorType" => "TRACK",
"Tracks" => [
1
]
]
],
"VideoSelector" => [
"ColorSpace" => "FOLLOW"
],
"FilterEnable" => "AUTO",
"PsiControl" => "USE_PSI",
"FilterStrength" => 0,
"DeblockFilter" => "DISABLED",
"DenoiseFilter" => "DISABLED",
"TimecodeSource" => "EMBEDDED",
"FileInput" => "s3://INPUT_BUCKET_AND_FILE_NAME"
]
],
"TimecodeConfig" => [
"Source" => "EMBEDDED"
]
];
```
### 创建作业
在创建任务参数 JSON 后，通过调用 `AWS.MediaConvert service object` 并传递参数，来调用 createJob 方法。所创建任务的 ID 在响应数据中返回。
**示例代码**
```
try {
$result = $mediaConvertClient->createJob([
"Role" => "IAM_ROLE_ARN",
"Settings" => $jobSetting, //JobSettings structure
"Queue" => "JOB_QUEUE_ARN",
"UserMetadata" => [
"Customer" => "Amazon"
],
]);
} catch (AwsException $e) {
// output error message if fails
echo $e->getMessage();
echo "\n";
}
```
### 检索任务
使用在调用 createjob 时返回的 JobID，您可以获取最近任务的 JSON 格式的详细描述。
**示例代码**
```
$mediaConvertClient = new MediaConvertClient([
'version' => '2017-08-29',
'region' => 'us-east-2',
'profile' => 'default'
]);
try {
$result = $mediaConvertClient->getJob([
'Id' => 'JOB_ID',
]);
} catch (AwsException $e) {
// output error message if fails
echo $e->getMessage();
echo "\n";
}
```
### 取消任务
使用在调用 createjob 时返回的 JobID，您可以取消仍在队列中的任务。您无法取消已开始转码的任务。
**示例代码**
```
$mediaConvertClient = new MediaConvertClient([
'version' => '2017-08-29',
'region' => 'us-east-2',
'profile' => 'default'
]);
try {
$result = $mediaConvertClient->cancelJob([
'Id' => 'JOB_ID', // REQUIRED The Job ID of the job to be cancelled.
]);
} catch (AwsException $e) {
// output error message if fails
echo $e->getMessage();
echo "\n";
}
```
### 列出最近的转码任务
创建包括值的参数 JSON，以指定是按升序还是降序对列表排序，要检查的任务队列的 ARN，以及要包含的任务的状态。这将返回最多 20 个任务。要检索后面的 20 个最近任务，请使用随结果返回的 nextToken 字符串。
**示例代码**
```
$mediaConvertClient = new MediaConvertClient([
'version' => '2017-08-29',
'region' => 'us-east-2',
'profile' => 'default'
]);
try {
$result = $mediaConvertClient->listJobs([
'MaxResults' => 20,
'Order' => 'ASCENDING',
'Queue' => 'QUEUE_ARN',
'Status' => 'SUBMITTED',
// 'NextToken' => '', //OPTIONAL To retrieve the twenty next most recent jobs
]);
} catch (AwsException $e) {
// output error message if fails
echo $e->getMessage();
echo "\n";
}
```