About 02_video_dec_cuda

Autonomous Machines Jetson & Embedded Systems Jetson Nano
1

hi everyone,when i run the jetson nano samples 02_video_dec_cuda,i found that if my dec h264 file is bt709 ,the 02_video_dec_cuda will report that error ,
libv4l2_nvvidconv (0):(1688) (ERROR) : NvDdkVicConfigure Failed
libv4l2_nvvidconv (0):(1710) (ERROR) : NVVIDCONV ERROR 2

my test run command is sudo ./video_dec_cuda 1080P.h264 H264 -o tt.yuv --input-nalu --disable-rendering

if the dec h264 file is bt601,that will dec ok,so i want to know whether the nano 02_video_dec_cuda can not dec bt709 h264 stream
thanks for your help!!!

3

Hi,
Please use NvBufferTransform(). We encourage users to use NvBuffer APIs. NvVideoConverter is kept for backward compatibility and no longer upgraded.

4

@DaneLLL,hi ,thanks for your help,if i want to convert the dec yuv to bgr ,so i just can found that samples 07_video_convert can fix this,but that sample alsa use the NvVideoConverter ,so how can i do

5

Hi,
We have updated 07_video_convert in r32.4.3. If you use previous release, please check how NvBufferTransform() is used in 00_video_decode.

6

@DaneLLL，you mean we can modify that follow source coder about that input_params.colorFormat to NvBufferColorFormat_ABGR32,then wo can use the NvBufferTransform to convert yuv to bgr?

input_params.payloadType = NvBufferPayload_SurfArray;
input_params.width = crop.c.width;
input_params.height = crop.c.height;
input_params.layout = NvBufferLayout_Pitch;
if (ctx->out_pixfmt == 1)
  input_params.colorFormat = NvBufferColorFormat_NV12;
else if (ctx->out_pixfmt == 2)
  input_params.colorFormat = NvBufferColorFormat_YUV420;
else if (ctx->out_pixfmt == 3)
  input_params.colorFormat = NvBufferColorFormat_NV16;
else if (ctx->out_pixfmt == 4)
  input_params.colorFormat = NvBufferColorFormat_NV24;

input_params.nvbuf_tag = NvBufferTag_VIDEO_CONVERT;
7

Hi,
Yes, please look at definition in nvbuf_utils.h:

/**
 * Transforms one DMA buffer to another DMA buffer.
 * This function can support transforms for copying, scaling, fliping, rotating, and cropping.
 * @param[in] src_dmabuf_fd DMABUF FD of source buffer
 * @param[in] dst_dmabuf_fd DMABUF FD of destination buffer
 * @param[in] transform_params transform parameters
 *
 * @return 0 for sucess, -1 for failure.
 */
int NvBufferTransform (int src_dmabuf_fd, int dst_dmabuf_fd, NvBufferTransformParams *transform_params);

Source buffer is from decoder and you need to allocate destination buffer in NvBufferColorFormat_ABGR32. After calling NvBufferTransform(), you will get RGBA buffer.

8

thanks for your help ,above that you write the that We have updated 07_video_convert in r32.4.3
so where can i download tha r32.4.3 source code,i can not found at the follow link
https://developer.nvidia.com/embedded/downloads#?tx=$product,jetson_nano

9

Hi,
Now the samples are installed through SDKManager.

After the installation, the samples are in

/usr/src/jetson_multimedia_api
10

@DaneLLL， ok，thanks for your help,last question is that i want to know whether other samples for example the video dec ,jpeg dec ，It’s better not to use the NvVideoConverter::createVideoConverter to create convert，and use the NVBUF_TRANSFORM_API to fix it

11

Hi,
Yes, please use NvBufferTransform() function for conversion/scaling/cropping.

12

@DaneLLL,hi i want to know whether the NvBufferTransform() can conversion the yuv to ABGR32 or XRGB32,if i do not want the alpha,just bgr 24bit data,so that NvBufferTransform can fix it

13

Hi,
32-bit ABGR32 and XRGB32 are supported in NvBufferTransform(). 24-bit BGR is not supported. It is limitation of hardware VIC engine. Please check