The "HDMI" Output Format actually has the receiver query the TV as to its preferred resolution and adjust accordingly. As such, a 480i override isn't necessary.
For most people, we don't recommend using the "HDMI" output format - set the Output Format to 1080i (or 720p if you prefer) and then turn the Override on or off depending on your needs. Not all TVs report a correct "preferred" value, and on some TVs using the "HDMI" setting causes longer channel changes.
Here's a quick summary of the Video Settings found in OPTIONS 4-5:
1080i, 720p, 480p, and 480i are the resolutions you can force all content to. This only applies to the HDMI and Component video output.
Native will output at the same resolution as the channel comes in at with no conversion. On some TVs, this causes longer channel changes as the TV adjusts to the new resolution with each change. See 57's post here
HDMI will query the TV as to its preferred resolution and adjust accordingly. This is not recommended as some TVs seem to request 480p or 480i, and suddenly you're not getting HD resolution anymore.
The 4x3 Override setting will "override" the specified Output Format when tuned to SD channels.
Leave this on 16x9 unless you have a 4x3 square HDTV.
For most people, we recommend an Output Format of 1080i.
1) If you want SD stations stretched by your TV
, set the 4x3 Override to 480i.
2) If you don't want
the SD stations stretched, leave the 4x3 Override Off.
Regardless of your settings, you can always use the ASPECT button on the remote to Stretch or Zoom the picture if desired.