The embed code contains parameters that affect how the player is rendered inside the iframe. For example, you can change the size of the player, whether it starts playing automatically, when it starts, etc. The embedding options are presented to you where you find the embed code. Find it via My Account > Media item's Edit Details > Properties > scroll down to Embedding settings.
Alternatively, open the Media page > Share > 'Embed Code' tab.
Options for Customizing Embedded Player
Parameter | Video player | Audio player | Playlist player |
Auto start | Yes | Yes | Yes |
Mute on start | Yes | Yes | Yes |
Set start time | Yes | Yes | No |
Show annotations | Yes | Yes | Yes |
Change position of playlist items | N/A | N/A | Yes |