How to save the result of deepstream-dewarper-test in mp4

Accelerated Computing Intelligent Video Analytics DeepStream SDK
1

• Hardware Platform (Jetson / GPU) ：Jetson AGX Xavier
• DeepStream Version :5.1
• JetPack Version (valid for Jetson only) :4.5.1

When I ran the sample app, I confirmed that the undistorted video was displayed on the display.
I’m trying to make change the deepstream-dewarper-app.c to save the undistorted video.

I changed the as follows:
– sink = gst_element_factory_make (“nveglglessink”, “nvvideo-renderer”);
++ sink = gst_element_factory_make (“filesink”, “filesink”);
++ g_object_set(G_OBJECT(sink), “location”, “test.mp4”, NULL); .

When I run it after make, I get the following error in the terminal:
Now playing: file:/// -(secret)- /sources/apps/sample_apps/deepstream-dewarper-test/input_streams/105_2021-03-10_102826.mp4
Decodebin child added: source
Decodebin child added: decodebin0
Running…
Decodebin child added: qtdemux0
Decodebin child added: multiqueue0
Decodebin child added: h264parse0
Decodebin child added: capsfilter1
Decodebin child added: aacparse0
Decodebin child added: faad0
Decodebin child added: nvv4l2decoder0
Opening in BLOCKING MODE
Opening in BLOCKING MODE
NvMMLiteOpen : Block : BlockType = 261
NVMEDIA: Reading vendor.tegra.display-size : status: 6
NvMMLiteBlockCreate : Block : BlockType = 261
In cb_newpad
In cb_newpad
ERROR from element qtdemux0: Internal data stream error.
Error details: qtdemux.c(6073): gst_qtdemux_loop (): /GstPipeline:dewarper-app-pipeline/GstBin:source-bin-00/GstURIDecodeBin:uri-decode-bin/GstDecodeBin:decodebin0/GstQTDemux:qtdemux0:
streaming stopped, reason error (-5)
Returned, stopping playback
Deleting pipeline

How do I save the undistorted video?
Thank you.

3

How much do you know about mp4 video file? How much do you know about gstreamer basic knowledge and coding skills?

Why do you think you can save a hardware RGB buffer directly to a mp4 file?

There is sample code for save mp4 file in create_encode_file_bin() in deepstream_sink_bin.c in /opt/nvidia/deepstream/deepstream/sources/apps/apps-common/src/ folder.

4

Thank you for your quick reply.

I don’t understand the mp4 video file format and am a beginner about gstreamer.
It seems that I need to study with the sample code you taught me.

5

You’d better start with gstreamer and video format and container knowledge first before you start with any deepstream sample. GStreamer: open source multimedia framework

8

Thanks.
I achieved this aim, so describe the element configuration in the pipeline.
source_bin->nvvideoconvert1->capsfilter1->nvdewarper->streammux->nvvideoconvert2->capsfilter2->nvvideoconvert3->capsfilter3->x264enc->qtmux->sink