There is no such thing as 16:9 SD video in the video element of composite video. As you've stated, the resolution is 720x576 which is 5:4.
You're referring to the widescreen signalling (WSS
), which is a side-channel.
The Pi is a computer, not a DVD recorder. When your computer produces WSS correctly then feel free to complain.
I suspect you'll have further entertainment getting whatever application you're using to understand that you no longer have square pixels either.
And I suspect that your DVD recorder is using the widescreen selection via pin 8 of the SCART connector
rather than WSS embedded in the video stream.
James: I do have an analogue video capture board that can read the WSS signalling state if you want to follow this up. The DVD player on my desk should be able to produce the relevant signals as a reference source.
Software Engineer at Raspberry Pi Trading. Views expressed are still personal views.
I'm not interested in doing contracts for bespoke functionality - please don't ask.