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vidioc_dqbuf ioctl hangs

Hello,


I m working on vpetest demo, to convert nv12 format to rgb24 format, i have changed number of input buffers (NUMBUF) to 1, and applied interlacing , vidioc_dqbuf hangs for output buffer. I run application as

./testvpem2m inputfile.yuv 320 160 nv12 output.rgb 160 80 rgb24 1 3 

I have taken source code from below link.

can anyone helpme out with this???

Regards,