Raspistill preview with 16:9 ratio on PAL composite display
Software: raspbian, hardware: Pi model B 512 with camera board
Display: rear view car display, PAL composite input, 480x272 resolution, 16:9 aspect ratio
Goal: I'd like to shot still images with raspistill then show it on the screen - with valid 16:9 ratio at both stages (camera preview and final image). I know PAL is 4:3 only, I'd like to push anamorphic signal from Pi and let display scale it to target width/height proportions.
What I'm able to do: if I switch display to 4:3 mode, use raspistill to shot and fbi to show works as expected, but display has black bars on left and right edge.
Problem: If I switch display to widened 16:9 mode, I'm unable to convince raspistill to do 16:9 fullscreen image preview (which would be too tall on assumed 4:3 display but OK on widened display).
When I use sdtv_aspect=3 mode switch in config.txt, nothing changes in raspistill preview no matter what options I use. It has either 16:9 image preview with black bars on top and bottom (therefore deformed on widened display) or fullscreen 4:3 preview (also deformed on widened display) but not both (expected fullscreen preview of 16:9 image).
With sdtv_aspect=3 the fbi image viewer adds extra black bars to displayed 4:3 image which effectively cancels widening done in display (expected effect). Raspistill ignores sdtv_aspect.
I have tried to disable overscan or define 480x272 framebuffer, without luck.
(also asked on http://raspberrypi.stackexchange.com/qu ... l-169-disp)