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Obtain 5MP jpeg with DM365IPNC

Hi,
i'm trying to obtain 5MP images from a DM365IPNC (MT9P031 sensor)
i have followed the instructions explained in http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/100/t/48337.aspx  and it seems to work ...

the first captured frame is correct then the next ones seem to lose brightness and, after a few times, becomes completely black. this happens also if i use DDR_IN capture mode for 3MP images and is already visible in RAW data.

What can i do? I have disabled AEWB option and debugging the application it seems there is not any other auto adjustment procedure
Can anyone help me? Someone has even tried this? What can i test in the av_server code?

best regards,
Andrea