I just found a way to centre an embedded video in a post (see here for info about embedded video). So far all embedded video has aligned to the left of a post and unlike images the text alignment tools have no effect.
This is the work around I found, it only works if you have a normal image already in the post.
- Switch to the Text view in the post editor :
- Copy the text that specifies the alignment of the image in the post (highlighted) and paste it into the code of the embedded video just before it says “scr=”
- It should look something like this
- Voila, centred video!