终止支持通知：2025 年 11 月 13 日， AWS 我们将停止对亚马逊 Elastic Transcoder 的支持。2025 年 11 月 13 日之后，您将无法再访问 Elastic Transcoder 控制台或 Elastic Transcoder 资源。
有关过渡到的更多信息 AWS Elemental MediaConvert，请访问此[博客文章](https://aws.amazon.com/blogs/media/how-to-migrate-workflows-from-amazon-elastic-transcoder-to-aws-elemental-mediaconvert/)。
本文属于机器翻译版本。若本译文内容与英语原文存在差异，则一律以英文原文为准。
# 列出预设
**Topics**
+ [描述](#list-presets-description)
+ [请求](#list-presets-requests)
+ [响应](#list-presets-responses)
+ [错误](#list-presets-response-errors)
+ [示例](#list-presets-examples)
## 描述
要获取与当前 AWS 账户关联的所有预设的列表，请向 `/2012-09-25/presets` 资源发送 GET 请求。
## 请求
### 语法
```
GET /2012-09-25/presets/Ascending=true|false&
PageToken=value for accessing the next page of
results HTTP/1.1 Content-Type: charset=UTF-8
Accept: */*
Host: elastictranscoder.Elastic Transcoder endpoint.amazonaws.com:443
x-amz-date: 20130114T174952Z
Authorization: AWS4-HMAC-SHA256
Credential=AccessKeyID/request-date/Elastic Transcoder endpoint/elastictranscoder/aws4_request,
SignedHeaders=host;x-amz-date;x-amz-target,
Signature=calculated-signature
```
### 请求参数
此操作接受以下请求参数。Elastic Transcoder 会返回所有可用的预设。
** 升序**
要按提交预设的日期和时间顺序列出预设，请输入 `true`。要按反向的时间顺序列出预设，请输入 `false`。
**PageToken**
当 Elastic Transcoder 返回多个结果页面时，请使用后续 `GET` 请求中的 `PageToken` 获取每个连续的结果页面。
### 请求标头
此操作仅使用所有操作通用的请求标头。有关通用请求标头的信息，请参阅 [HTTP 标头内容](making-http-requests.md#http-request-header)。
### 请求正文
请求正文中的 JSON 字符串包含以下对象。
## 响应
### 语法
```
Status: 200 OK
x-amzn-RequestId: c321ec43-378e-11e2-8e4c-4d5b971203e9
Content-Type: application/json
Content-Length: number of characters in the response
Date: Mon, 14 Jan 2013 06:01:47 GMT
{
"Presets":[
{
"Id":"preset ID",
"Type":"Custom|System",
"Name":"preset name",
"Description":"preset description",
"Container":"flac|flv|fmp4|gif|mp2|mp3|mp4|mpg|mxf|oga|ogg|ts|wav|webm",
"Audio":{
"Codec":"AAC|flac|mp2|mp3|pcm|vorbis",
"CodecOptions":{
"Profile":"auto|AAC-LC|HE-AAC|HE-AACv2",
"BitDepth":"8|16|24|32",
"Signed":"Signed|Unsigned",
"BitOrder":"LittleEndian"
},
"SampleRate":"auto|22050|32000|44100|48000|96000",
"BitRate":"audio bit rate of output file in kilobits/second",
"Channels":"auto|0|1|2",
"AudioPackingMode":"SingleTrack|OneChannelPerTrack|
OneChannelPerTrackWithMosTo8Tracks"
},
"Video":{
"Codec":"gif|H.264|mpeg2|vp8|vp9",
"CodecOptions":{
"Profile":"baseline|main|high|0|1|2|3",
"Level":"1|1b|1.1|1.2|1.3|2|2.1|2.2|3|3.1|3.2|4|4.1",
"MaxReferenceFrames":maximum number of reference frames,
"MaxBitRate":"maximum bit rate",
"BufferSize":"maximum buffer size",
"InterlacedMode":"Progressive|TopFirst|BottomFirst|Auto",
"ColorSpaceConversionMode":"None|Bt709ToBt601|Bt601ToBt709|Auto",
"ChromaSubsampling":"yuv420p|yuv422p",
"LoopCount":"Infinite|[0,100]"
},
"KeyframesMaxDist":maximum frames between key frames,
"FixedGOP":"true|false",
"BitRate":"auto|video bit rate of output file in kilobits/second",
"FrameRate":"auto|10|15|23.97|24|25|29.97|30|50|60",
"MaxFrameRate":"10|15|23.97|24|25|29.97|30|50|60",
"MaxWidth":"auto|[128,4096]",
"MaxHeight":"auto|[96,3072]",
"SizingPolicy":"Fit|Fill|Stretch|Keep|ShrinkToFit|ShrinkToFill",
"PaddingPolicy":"Pad|NoPad",
"DisplayAspectRatio":"auto|1:1|4:3|3:2|16:9",
"Resolution":"width in pixelsxheight in pixels" ,
"AspectRatio":"auto|1:1|4:3|3:2|16:9"
"Watermarks":[
{
"Id":"unique identifier up to 40 characters",
"MaxWidth":"[16,Video:MaxWidth]px|[0,100]%",
"MaxHeight":"[16,Video:MaxHeight]px|[0,100]%",
"SizingPolicy":"Fit|Stretch|ShrinkToFit",
"HorizontalAlign":"Left|Right|Center",
"HorizontalOffset":"[0,100]%|[0,Video:MaxWidth]px",
"VerticalAlign":"Top|Bottom|Center",
"VerticalOffset":"[0,100]%|[0,Video:MaxHeight]px",
"Opacity":"[0,100]",
"Target":"Content|Frame"
}
]
},
"Thumbnails":{
"Format":"jpg|png",
"Interval":"number of seconds between thumbnails",
"MaxWidth":"auto|[32,4096]",
"MaxHeight":"auto|[32,3072]",
"SizingPolicy":"Fit|Fill|Stretch|Keep|ShrinkToFit|ShrinkToFill",
"PaddingPolicy":"Pad|NoPad",
"Resolution":"width in pixelsxheight in pixels",
"AspectRatio":"auto|1:1|4:3|3:2|16:9"
},
},
{...},
],
"NextPageToken":value for accessing the next page of results|null
}
```
### 响应标头
此操作仅使用大多数响应通用的响应标头。有关通用响应标头的信息，请参阅 [HTTP 响应](making-http-requests.md#http-response-header)。
### 响应正文
响应正文中的 JSON 字符串将返回您在创建预设时指定的值。有关各个对象的更多信息，请参阅 [您在创建 Elastic Transcoder 预设时指定的设置](preset-settings.md)。
此外，Elastic Transcoder 将返回以下值。
**（自动）Id**
预设的标识符。您可以使用该值获取预设的设置或将其删除。
**（自动）Type**
该预设是 Elastic Transcoder (`System`) 提供的默认预设还是您定义的预设 (`Custom`)。
**（自动） NextPageToken**
用于访问第二页及后续结果页的值（如果有）。当预设适合放在一页上时，或当您已到达结果的最后一页时，`NextPageToken` 的值为`null`。
## 错误
有关 Elastic Transcoder 异常和错误消息的信息，请参阅 [处理 Elastic Transcoder 中的错误](error-handling.md)。
## 示例
以下示例请求将创建一个名为 `DefaultPreset` 的预设。
### 示例请求
```
GET /2012-09-25/presets HTTP/1.1
Content-Type: charset=UTF-8
Accept: */*
Host: elastictranscoder.Elastic Transcoder endpoint.amazonaws.com:443
x-amz-date: 20130114T174952Z
Authorization: AWS4-HMAC-SHA256
Credential=AccessKeyID/request-date/Elastic Transcoder endpoint/elastictranscoder/aws4_request,
SignedHeaders=host;x-amz-date;x-amz-target,
Signature=calculated-signature
```
### 示例响应
```
Status: 200 OK
x-amzn-RequestId: c321ec43-378e-11e2-8e4c-4d5b971203e9
Content-Type: application/json
Content-Length: number of characters in the response
Date: Mon, 14 Jan 2013 06:01:47 GMT
{
"Presets":[
{
"Id":"5555555555555-abcde5",
"Type":"Custom",
"Name":"DefaultPreset",
"Description":"Use for published videos",
"Container":"mp4",
"Audio":{
"BitRate":"96",
"Channels":"2",
"Codec":"AAC",
"CodecOptions":{
"Profile":"AAC-LC"
},
"SampleRate":"44100"
},
"Video":{
"Codec":"H.264",
"CodecOptions":{
"Profile":"main",
"Level":"2.2",
"MaxReferenceFrames":"3",
"MaxBitRate":"",
"BufferSize":"",
"InterlacedMode":"Progressive",
"ColorSpaceConversionMode":"None"
},
"KeyframesMaxDist":"240",
"FixedGOP":"false",
"BitRate":"1600",
"FrameRate":"auto",
"MaxFrameRate":"30",
"MaxWidth":"auto",
"MaxHeight":"auto",
"SizingPolicy":"Fit",
"PaddingPolicy":"Pad",
"DisplayAspectRatio":"auto",
"Watermarks":[
{
"Id":"company logo",
"MaxWidth":"20%",
"MaxHeight":"20%",
"SizingPolicy":"ShrinkToFit",
"HorizontalAlign":"Right",
"HorizontalOffset":"10px",
"VerticalAlign":"Bottom",
"VerticalOffset":"10px",
"Opacity":"55.5",
"Target":"Content"
}
]
}
"Thumbnails":{
"Format":"png",
"Interval":"120",
"MaxWidth":"auto",
"MaxHeight":"auto",
"SizingPolicy":"Fit",
"PaddingPolicy":"Pad"
},
},
{...}
]
}
```