JPEG encoding issue on DM368

Hongfeng Wang

I am running DVSDK4.02 on DM368 platform.

The YUV420P file is generated by dvsdk-demos/encode program, encoded h264 stream looks normal.

Then I try to encode a yuv frame to jpeg using:

./image_encode* -e encode -c jpegenc -i /dev/shm/raw.yuv -o /dev/shm/out.jpg -r 1920x1080 --iColorSpace 2 --oColorSpace 2

output is like this

So it appears to be pix format issue. Has somebody seen anything similar?

Thanks.

0 Akshay Panday over 14 years ago

Expert 1640 points

Hi,

It looks like your colourspace setting might be incorrect. What is your input format and what is your intended output format?

Regards,

Akshay

0 Hongfeng Wang over 14 years ago in reply to Akshay Panday

Genius 3925 points

Both input and output formats are YUV420P.

0 Hongfeng Wang over 14 years ago in reply to Hongfeng Wang

Genius 3925 points

I was wrong, the output of DM368 resizer is not really yuv420p, instead Cb and Cr are interleaved.

Is the JPEG encoder able to deal with this?

0 Hongfeng Wang over 14 years ago in reply to Hongfeng Wang

Genius 3925 points

It turned out that the yuv420sp (semi planar) support is already there, just not in the demo application.

Once this color space option added to main.c/appMain.c, and copy readFrame420SP() from video_encode_io1/appMain.c, it works perfectly now.

Thanks, everybody.

0 Akshay Panday over 14 years ago in reply to Hongfeng Wang

Expert 1640 points

Hi,

Yes, now I recall that the demo app does not support 420SP out of the box.

Regards,

Akshay

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