Nvvideoconvert Keeps Removing my NvDsMeta

Accelerated Computing Intelligent Video Analytics DeepStream SDK
1

Jetson nano with Jetpack 4.4 and Deepstream version 5.

I have the following pipeline. https://filebin.net/8i84jwbuf4t32bm7/pipeline.pdf?t=4nn6wc0h

appsrc->nvjpegdec->nvvideoconvert->nvstreammux->nvinfer->appsink. I add the metadata on src of appsrc but nvvideoconvert decides to remove them.

Any idea on how I could overcome this problem?

3

How do you add NvDsMeta in appsrc? Can you share the codes? How do you know the meta is removed by nvvideoconvert?

4 
GstBuffer *gst_buffer = gst_buffer_new_allocate(nullptr, bufferLength, nullptr);
gst_buffer_fill(gst_buffer, 0, buffer, bufferLength);

 FrameMeta *frameMeta = (FrameMeta *) g_malloc0(sizeof(FrameMeta);
meta = gst_buffer_add_nvds_meta(gst_buffer, frameMeta, NULL,
                                frame_meta_copy_func, frame_meta_release_func);
meta->meta_type = (GstNvDsMetaType)NVDS_GST_META_FRAME;

meta->gst_to_nvds_meta_transform_func = src_gst_to_nvds_meta_transform_func;
meta->gst_to_nvds_meta_release_func = frame_gst_nvds_meta_release_func;

ret = gst_app_src_push_buffer ((GstAppSrc*) app_source, gst_buffer);

If you add metadata before nvvideoconvert and try to get it after nvvideoconvert, it will be gone.

5

NVDS_GST_META_FRAME is not defined by DeepStream. So it is your customized meta data. nvvideoconvert will not remove it. You need to check you own implementation of the whole meta interfaces.

6

No, Take this pipeline
appsrc->nvjpegdec->nvvideoconvert->nvstreammux->nvinfer->appsink

if I attacj a probe on src/sink of nvjpegdec, I get the meta. If I probe on sink of nvvideoconvert I get the meta. But if I probe src of nvvideoconvert or anything after my meta is gone.

7

You have use “gst_buffer_add_nvds_meta” to add user meta, how do you retrieve the meta in the probe? Can you provide the complete codes?

8

I’ve tested with the modified the deepstream-gst-metadata-test sample to test your case. The customized nvdsmeta can be retrieved correctly after nvvideoconvert.

Please refer to deepstream_gst_metadata.c (19.8 KB)

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