NvVideoConverter limits YUV range to [16...235] after updating Jetpack to 4.6.1

[user94541]

Hello,

I’m using NvVideoConverter and NvJpegEncoder to convert image to jpeg on Jetson Xavier NX. After updating Jetpack from 4.5.0 to 4.6.1, value ranges of output jpeg are limited to [16…235].

My program does:

NV12 in full range – (NvVideoConverter) → YUV420 – (NvJpegEncoder) → jpeg output

I tried calling NvVideoConverter::setYUVRescale with V4L2_YUV_RESCALE_NONE and V4L2_YUV_RESCALE_STD_TO_EXT, but it did not solve the problem. Passing full range YUV420 to NvJpegEncoder without NvVideoConverter, the output range retains full [0…255].

I found a similar problem in this post.
NvBufferColorFormat_YUV420 range difference in new Tegra Release?

How can I keep full range with NvVideoConverter? It would be great if anyone can help me. Thank you for your time in advance!

[user94541]

Passing full range YUV420 to NvJpegEncoder without NvVideoConverter, the output range retains full [0…255].

This comment was my mistake. It seems, creating buffer using NvBufferCreateEx() with NvBufferColorFormat_YUV420_709_ER works around the problem. However, I found no way to change the type of buffer created by NvVideoConverter.

[DaneLLL]

Hi,
Please call NvBufferTransform() instead of usingNvVideoConverter. And if there is further issues, please replace this prebuilt lib and give it a try:

Jetson/L4T/r32.7.x patches - eLinux.org

[MMAPI] 07_video_convert sample result not match as expected