[DeepStream 6] uridecodebin always outputs video/x-raw(memory:NVMM) buffer. Is that correct?

neoragex2002 · March 7, 2022, 4:34pm

• Hardware Platform (Jetson / GPU): GPU
• DeepStream Version: 6.0
• TensorRT Version: 8.0.1.6+cuda11.3.1.005
• NVIDIA GPU Driver Version (valid for GPU only): 470.103.01
• Issue Type( questions, new requirements, bugs): question

Hi, I want to my decodebin plug to output video/x-raw buffer instead of video/x-raw(memory:NVMM).

The pipeline I used was below:

GST_DEBUG_DUMP_DOT_DIR=. gst-launch-1.0 uridecodebin uri=rtsp://10.0.0.207:50900/test caps='video/x-raw' ! nvvideoconvert ! autovideosink

Note that I used the caps property of uridecodebin to specify the memory location of its outputs.

But when I checked the debug .dot of pipeline, I found the output format of uridecodebin is always video/x-raw(memory:NVMM). It seems that the caps property of uridecodebin DOES NOT work at all …

The question is: Is that behavior by design? I know that there is a nvv4l2decoder plug inside of the uridecodebin and it outputs NVMM buffers. What I have expected is just something like an auto-spawned nvvideoconvert inside of the uridecodebin. Is my understanding correct?

Thanks!

Fiona.Chen · March 8, 2022, 7:11am

Yes.

No. There is no nvvideoconvert inside uridecodebin

Please study uridecodebin by yourself. uridecodebin (gstreamer.freedesktop.org)

github.com

GStreamer/gst-plugins-base/blob/master/gst/playback/gsturidecodebin.c

/* GStreamer
 * Copyright (C) <2007> Wim Taymans <wim.taymans@gmail.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

/**

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neoragex2002 · March 8, 2022, 3:35pm

@Fiona.Chen Thank you for your kindly reply!

I have solved my issue by hooking the autoplug_select events of uridecodebin to select a software decoder, then I could make sure the uridecodebin always outputs video/x-raw instead of video/x-raw(NVMM).

system · March 29, 2022, 2:20am

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