多重素材資源編輯
透過集合功能整理內容
你可以依據偏好儲存及分類內容。
您可以透過 Transformer 合併多個媒體資產
映像檔和音訊檔案來建立Composition
。
匯出組合
套用轉換
(例如特效或修剪編輯) 的 MediaItem
,您應該建立
EditedMediaItem
。
,表示已套用轉換的資產。
接著,您可以將 EditedMediaItem
物件串連在一起
EditedMediaItemSequence
。
舉例來說,您可以建立含有兩項編輯的 EditedMediaItemSequence
影片。EditedMediaItemSequence
中的項目會按照順序排列,
不會重疊
Composition
是一或多個 EditedMediaItemSequence
的組合
如需儲存大量結構化物件
建議使用 Cloud BigtableComposition
中的所有 EditedMediaItemSequence
物件都混合
可讓您結合影片和音訊素材資源
Composition
物件可使用 Transformer 匯出。
以下範例說明如何建立並匯出內含
已編輯的影片片段,疊加在音軌上:
Kotlin
val transformer = ... // Set up Transformer instance
val video1 = EditedMediaItem.Builder(
MediaItem.fromUri(video1Uri))
.build()
val video2 = EditedMediaItem.Builder(
MediaItem.fromUri(video2Uri))
.build()
val videoSequence = EditedMediaItemSequence(
video1, video2)
val backgroundAudio = EditedMediaItem.Builder(
MediaItem.fromUri(audioUri))
.build()
val backgroundAudioSequence = EditedMediaItemSequence(
ImmutableList.of(backgroundAudio),
/* isLooping= */ true) // Loop audio track through duration of videoSequence
val composition = Composition.Builder(
videoSequence,
backgroundAudioSequence)
.build()
val filePath = ... // Provide file path to save Composition
transformer.start(composition, filePath)
Java
Transformer transformer = ... // Set up Transformer instance
EditedMediaItem video1 = new EditedMediaItem.Builder(
MediaItem.fromUri(video1Uri))
.build();
EditedMediaItem video2 = new EditedMediaItem.Builder(
MediaItem.fromUri(video2Uri))
.build();
EditedMediaItemSequence videoSequence = new EditedMediaItemSequence(
video1, video2);
EditedMediaItem backgroundAudio = new EditedMediaItem.Builder(
MediaItem.fromUri(audioUri))
.build();
EditedMediaItemSequence backgroundAudioSequence = new EditedMediaItemSequence(
ImmutableList.of(backgroundAudio),
/* isLooping= */ true); // Loop audio track through duration of videoSequence
String filePath = ... // Provide file path to save Composition
Composition composition = new Composition.Builder(
videoSequence,
backgroundAudioSequence)
.build();
transformer.start(composition, filePath);
支援用途示例
這份清單僅列舉部分例子:Transformer API 的用途
可支援組合:
- 可連續搭配音訊、圖片和影片素材資源。不過,所有項目
順序必須具有相同的音軌。例如,在某個 Pod 中
包含一個純音訊檔案,後面接著影片檔案。
- 為影片素材資源加入背景音訊。
- 為組合新增效果。
- 使 HDR 輸入能轉換成 SDR 的色調,以產生畫質更好的 SDR 輸出。
目前限制
組合中的序列必須符合
Transformer.start()
。
此外,系統在處理以下作業時尚未支援
樂曲:
- 使用偏移值開始播放
EditedMediaItemSequence
。
- 將影片或音軌交叉淡出
功能要求
如果您對 Transformer API 提出任何功能要求,請在
Media3 GitHub 存放區。
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上次更新時間:2025-07-27 (世界標準時間)。
[[["容易理解","easyToUnderstand","thumb-up"],["確實解決了我的問題","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["缺少我需要的資訊","missingTheInformationINeed","thumb-down"],["過於複雜/步驟過多","tooComplicatedTooManySteps","thumb-down"],["過時","outOfDate","thumb-down"],["翻譯問題","translationIssue","thumb-down"],["示例/程式碼問題","samplesCodeIssue","thumb-down"],["其他","otherDown","thumb-down"]],["上次更新時間:2025-07-27 (世界標準時間)。"],[],[],null,["# Multi-asset editing\n\nUsing Transformer, you can combine multiple media assets, such as videos,\nimages, and audio files to create a `Composition`.\n\nExporting a Composition\n-----------------------\n\nTo apply [transformations](/media/media3/transformer/transformations)\n(such as effects or trimming edits) to a `MediaItem`, you should create an\n[`EditedMediaItem`](/reference/androidx/media3/transformer/EditedMediaItem)\nto represent the asset that has the transformations applied to it.\n\n`EditedMediaItem` objects can then be concatenated together to create an\n[`EditedMediaItemSequence`](/reference/androidx/media3/transformer/EditedMediaItemSequence).\nFor example, you can create an `EditedMediaItemSequence` with two edited\nvideos. Items inside an `EditedMediaItemSequence` are ordered sequentially and\ndon't overlap in time.\n\nA `Composition` is the combination of one or more `EditedMediaItemSequence`\nobjects. All `EditedMediaItemSequence` objects in the `Composition` are mixed\ntogether, allowing you to combine video and audio assets.\n\n`Composition` objects can be exported using Transformer.\n\nHere is an example of creating and exporting a video asset that consists of two\nedited video clips, overlaid with an audio track: \n\n### Kotlin\n\n```kotlin\nval transformer = ... // Set up Transformer instance\n\nval video1 = EditedMediaItem.Builder(\n MediaItem.fromUri(video1Uri))\n .build()\n\nval video2 = EditedMediaItem.Builder(\n MediaItem.fromUri(video2Uri))\n .build()\n\nval videoSequence = EditedMediaItemSequence(\n video1, video2)\n\nval backgroundAudio = EditedMediaItem.Builder(\n MediaItem.fromUri(audioUri))\n .build()\n\nval backgroundAudioSequence = EditedMediaItemSequence(\n ImmutableList.of(backgroundAudio),\n /* isLooping= */ true) // Loop audio track through duration of videoSequence\n\nval composition = Composition.Builder(\n videoSequence,\n backgroundAudioSequence)\n .build()\n\nval filePath = ... // Provide file path to save Composition\n\ntransformer.start(composition, filePath)\n```\n\n### Java\n\n```java\nTransformer transformer = ... // Set up Transformer instance\n\nEditedMediaItem video1 = new EditedMediaItem.Builder(\n MediaItem.fromUri(video1Uri))\n .build();\n\nEditedMediaItem video2 = new EditedMediaItem.Builder(\n MediaItem.fromUri(video2Uri))\n .build();\n\nEditedMediaItemSequence videoSequence = new EditedMediaItemSequence(\n video1, video2);\n\nEditedMediaItem backgroundAudio = new EditedMediaItem.Builder(\n MediaItem.fromUri(audioUri))\n .build();\n\nEditedMediaItemSequence backgroundAudioSequence = new EditedMediaItemSequence(\n ImmutableList.of(backgroundAudio),\n /* isLooping= */ true); // Loop audio track through duration of videoSequence\n\nString filePath = ... // Provide file path to save Composition\n\nComposition composition = new Composition.Builder(\n videoSequence,\n backgroundAudioSequence)\n .build();\n\ntransformer.start(composition, filePath);\n```\n\n\u003cbr /\u003e\n\nExamples of supported use cases\n-------------------------------\n\nThis is a non-exhaustive list of use cases that the Transformer API\nsupports with Compositions:\n\n- Sequentially combining audio, image, and video assets. However, all items in a sequence must have the same tracks. For example, you cannot have a sequence that contains an audio only file, followed by a video file.\n- Adding background audio to a video asset.\n- Adding effects to a Composition.\n- Tone mapping HDR input to SDR to generate better visual quality SDR output.\n\nCurrent limitations\n-------------------\n\nSequences within a Composition must meet the conditions outlined in\n[`Transformer.start()`](/reference/androidx/media3/transformer/Transformer#start(androidx.media3.transformer.Composition,java.lang.String)).\nFurthermore, the following operations are not yet supported when working with\nCompositions:\n\n- Starting playback of an `EditedMediaItemSequence` with an offset.\n- Crossfading video or audio tracks\n\nFeature requests\n----------------\n\nIf you have any feature requests for the Transformer API, file an issue on the\n[Media3 GitHub repository](https://github.com/androidx/media/issues)."]]