预览

一个preview是一个包含可选缩略图或视频的元数据的字典，可以在ClearML Enterprise WebApp（UI）中使用，以查看数据集中的选定内容。previews包括缩略图或视频的uri。

预览不是强制性的。它们的主要用途是查看无法在网页浏览器中显示的格式的图像（例如TIFF和3D格式）。

示例

以下是预览元数据的示例。

"preview": {
        "content_type": "image/jpg",
        "uri": "https://s3.amazonaws.com/my_previews/car_1/front_preview.jpg",
        "timestamp": 0
    }

{
    "timestamp": 1234567889,
    "context_id": "car_1",
    "meta": {
        "velocity": "60"
    },
    "sources": [
        {
            "id": "front",
            "content_type": "video/mp4",
            "width": 800,
            "height": 600,
            "uri": "https://s3.amazonaws.com/my_cars/car_1/front.mp4",
            "timestamp": 1234567889,
            "meta" :{
                "angle":45,
                "fov":129
            },
            "preview": {
                "content_type": "image/jpg",
                "uri": "https://s3.amazonaws.com/my_previews/car_1/front_preview.jpg",
                "timestamp": 0
            },
            "masks": [
                {
                    "id": "seg",
                    "content_type": "video/mp4",
                    "uri": "https://s3.amazonaws.com/seg_masks/car_1/front_seg.mp4",
                    "timestamp": 1234567889
                },
                {
                    "id": "instances_seg",
                    "content_type": "video/mp4",
                    "uri": "https://s3.amazonaws.com/seg_masks/car_1/front_instance_seg.mp4",
                    "timestamp": 1234567889
                }
            ]
        },
        {
            "id": "rear",
            "uri": "https://s3.amazonaws.com/my_cars/car_1/rear.mp4",
            "content_type": "video/mp4",
            "timestamp": 1234567889
        }
    ],
    "rois": [
        {
            "sources": ["front"],
            "label": ["bike"],
            "poly":[30, 50, 50,50, 100,50, 100,100],
            "meta": {
               "velocity": 5.4
            }
        },
        {
            "sources": ["front", "rear"],
            "label": ["car"],
            "poly":[30, 50, 50,50, 100,50, 100,100]
        }
    ]
}

以下是ClearML企业版WebApp（UI）中的预览示例。每个缩略图都是一个预览：

如果预览的 uri 是视频，缩略图将显示带有视频控件的视频：

视频预览

示例​

示例