Also you are using AV1 for both scart and composite on your TV? On my TVs (and any others I have seen) these are separate inputs.
Also you are using AV1 for both scart and composite on your TV? On my TVs (and any others I have seen) these are separate inputs.
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As per @ronand's reply - AV1, AV2 and AV3 are physically separate connections on my TV also. AV1 is SCART, AV2 is S-Video and AV3 is the composite. You should use connection-specific settings on the TV rather than the same for everything. On my HDMI input I use "exact pixel" so there is no overscan. On AV3 I use "wide" as the default and the picture switches between widescreen and 4:3 as the broadcaster changes aspect ratio. I think the ViX info screen for the broadcast channel will always show 16:9 as the screen ratio as this is derived from the satellite/cable/terrestrial meta data transmitted. It is the actual video stream content data that will switch from 16:9 to 4:3 as necessary.
Try setting your AV2 (or whatever) to "full wide" and flick from channel to channel - usually CBS Action or one of the low-budget channels will be showing 4:3 material through the day. (or Channel 4 from 08:00 - 10:30)
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