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CVBS output PAL format is cropped

Question asked by flto on Mar 17, 2015
Latest reply on Mar 31, 2015 by flto

Hi,

 

I try to output video on a CVBS display (from iMX53 with linux-2.6-imx-rel_imx_2.6.35_11.09.01 kernel from Freescale).

The display accepts PAL video format, so I use this kernel command line arguments :

video=mxcdi1fb:TV-PAL tve ldb=off

Thus my /dev/fb0 is displayed on the screen... but not entirely !

The image is cropped by about 30 pixels (left and right) and 15 pixels (top & bottom) [This is a rough estimation]

With an old TV, the image is cropped almost the same (but not exactly) and not cropped top and bottom when in 16:9 mode.

 

Does anyone know about CVBS, and has an idea why this happens ?

 

Here is fbset output:

$ fbset

 

mode "720x576-25"

        # D: 13.500 MHz, H: 15.625 kHz, V: 25.000 Hz

        geometry 720 576 720 1728 32

        timings 74074 132 11 22 26 1 1

        accel false

        rgba 8/16,8/8,8/0,8/24

endmode

 

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