Jepg_decode failes to decode grayscale jpeg

Hello. We have a camera that grabs data as color separated jpeg images. Therefor for each color I have a grayscale jpeg file. I’ve been trying to get the jpeg_decode working on the Xavier. The provided NvJpegDecode failed to decode the images with both options (–decode-fd and --decode-buffer). I have applied one of the patches found on the forum and I can now decdoe to buffer.

jpeg_decode num_files 1 ./1.jpg ./1.raw --decode-buffer
Image Resolution - 1232 x 1024
App run was successful

However the option --decode-fd still does not work.

jpeg_decode num_files 1 ./1.jpg ./1.raw --decode-fd
Failed to query video capabilities: Inappropriate ioctl for device
Unsupported color conversion request

I would like to have both options working, especially since decode to fd is supposed to be faster. Any help in getting it working is highly appreciated.

Looks like --decode-fd not support due to limit of HW alignment.

Is there any way to get this working? I need to decode 24 of these jpegs at 30 fps ? The best I can obtain now is 100 fps per image ( ~4 fps for all) using decode-buffer.

Please attach a GRAY jpeg so that we can reproduce the failure.

It is confirmed not supported. Please refer to

The JPEG decoder is capable of decoding YUV420, YUV422, and YUV444 JPEG images.

We will support GREY format in tegra_multimedia_api sample 12_camera_v4l2_cuda on r32.2. If your source is a USB camera, please wait for next r32.2.


Thanks for the information. I am not sure whether it will help. My camera is an USB camera, but the data format is proprietary. The 24 jpgs are all a subpart of the buffer.

For completeness I have attached one of the jpg files. I hope that GRAY jpegs will be fully supported in the next release(s).