
Read this: BBC, ITV learned how to use HD bitrates - Digital Spy

Summary: ITV HD also suffered a temporary reduction in screen resolution in September from 1440x1088 down to 960x1088 due to routine maintenance on an encoder. However, existing HD screen resolution issues on Freesat have been widely criticised by viewers, leading to fears that the same problems could result on Freeview HD when the service launches. - digitalspy.co.uk
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