This is an example of defining the source inlne in the data attribute.

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The code:
<object standby="Loading..." title="play" type="image/gif" data="data:image/gif;base64,/9j/4AAQSkZJRgABAgEASABIAAD/wAARCAAZABkDAREAAhEBAxEB/9sAhAAGBAUGBQQGBgUGBwcGCAoRCwoJCQoVDxAMERkWGhoYFhgXGx8oIRsdJR4XGCIvIyUpKiwtLBshMTQwKzQoKywrAQcHBwoJChQLCxQrHBgcHCsrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKysrKyv/xAGiAAABBQEBAQEBAQAAAAAAAAAAAQIDBAUGBwgJCgsQAAIBAwMCBAMFBQQEAAABfQECAwAEEQUSITFBBhNRYQcicRQygZGhCCNCscEVUtHwJDNicoIJChYXGBkaJSYnKCkqNDU2Nzg5OkNERUZHSElKU1RVVldYWVpjZGVmZ2hpanN0dXZ3eHl6g4SFhoeIiYqSk5SVlpeYmZqio6Slpqeoqaqys7S1tre4ubrCw8TFxsfIycrS09TV1tfY2drh4uPk5ebn6Onq8fLz9PX29/j5+gEAAwEBAQEBAQEBAQAAAAAAAAECAwQFBgcICQoLEQACAQIEBAMEBwUEBAABAncAAQIDEQQFITEGEkFRB2FxEyIygQgUQpGhscEJIzNS8BVictEKFiQ04SXxFxgZGiYnKCkqNTY3ODk6Q0RFRkdISUpTVFVWV1hZWmNkZWZnaGlqc3R1dnd4eXqCg4SFhoeIiYqSk5SVlpeYmZqio6Slpqeoqaqys7S1tre4ubrCw8TFxsfIycrS09TV1tfY2dri4+Tl5ufo6ery8/T19vf4+fr/2gAMAwEAAhEDEQA/APqG+uktIgzAszHCoOrGuHMcxoYCg69d2S+9vsioQc3ZGMdT1IkuPsajORHsZuPTdkfnt/Cvg5eID9p7tD3fXX8jq+qabmtp96t2hDL5cy/eTOfxB7ivtcpzfD5nR9rRe26e6OapTcHZluvVIOY8V39rps0t5qE3k2sFuGaRgdqAsQx47cLk9sZr8446hXrVsPRpq6d7Lu9P6R2YVpJtnCWnw50GH4e6h4aivtRbSNQdriS4N2GkG4hsq+MbflHYg85zkmvkZ55ipY+GMcY88FZK2mmmq7/0tjdUo8vL0Ow8HGz+z6MNKnaezW38qGUsXMkQXAYk9QSqnd349a+i4OliFm1VTVrxbkuzuvu326GWIt7NWOyr9TOEp6nZC8iG0qsyZ2sRkc9QfY8fkK8rOMoo5nh/Y1NGtU+zNKdRwd0eev8ADrTC5RtAk8rdk2sV8ws2Oc5MO8IR65j/AANfFvh3PIz5Y1Yv+9pzW/xcvN+J0e2pW2O90nTvsiiSYR+ft2gJ91F9B+Q9Og4r6vIsipZVSaT5py3f9dDCrVc2aNe8ZBQAUAFABQB//9k=" id="player" width="50" height="50" autoplay="true"></object>