umap - iframe max width smaller than image width

For visual aesthetic purposed I'd like youtube videos to have the same width as images. Currently, images are bigger and that just doesn't look good.

Here's a screenshot. Here, the youtube tag is just the default for iframes:

{{{https://www.youtube.com/embed/hmZ5S3WlKFg}}}

The width of the image above seems to be 341px, so tried forcing the youtube window like this, but the image doesn't get bigger than that apparently:

{{{https://www.youtube.com/embed/hmZ5S3WlKFg|192*341}}}