function makeVideoStream(height, aspectRatio=4/3) {
    const width = Math.round(height * aspectRatio);
    const streamGenerator = new shaka.test.ManifestGenerator.Stream(
        /* manifest= */ null,
        /* isPartial= */ false,
        /* id= */ nextId++,
        /* type= */ shaka.util.ManifestParserUtils.ContentType.VIDEO,
        /* lang= */ 'und');
    streamGenerator.size(width, height);
    streamGenerator.originalId = height.toString();
    return streamGenerator.build_();
  }
@param {number} height
@param {number=} aspectRatio
@return {shaka.extern.Stream}
@suppress {accessControls}