No element "avdec_h264"

[yongcong wu]

Dear support,

I installed gstreamer in centos7.9.
#*dnf install gstreamer1-devel gstreamer1-plugins-base-tools gstreamer1-doc
gstreamer1-plugins-base-devel gstreamer1-plugins-good
gstreamer1-plugins-good-extras gstreamer1-plugins-ugly
gstreamer1-plugins-bad-free gstreamer1-plugins-bad-free-devel
gstreamer1-plugins-bad-free-extras*
I get this result:
CentOS-7 - Base
                                                 1.8 MB/s |  10 MB     00:05
CentOS-7 - Updates
                                                  7.2 MB/s |  16 MB
00:02
CentOS-7 - Extras
                                                 104 kB/s | 310 kB     00:02
Last metadata expiration check: 0:00:01 ago on Mon 14 Feb 2022 08:54:12 PM.
No match for argument: gstreamer1-doc
No match for argument: gstreamer1-plugins-good-extras
No match for argument: gstreamer1-plugins-ugly
No match for argument: gstreamer1-plugins-bad-free-extras
Error: Unable to find a match: gstreamer1-doc
gstreamer1-plugins-good-extras gstreamer1-plugins-ugly
gstreamer1-plugins-bad-free-extras

I removed: gstreamer1-doc gstreamer1-plugins-good-extras
gstreamer1-plugins-ugly gstreamer1-plugins-bad-free-extras, and installed
the rest. After the installation:
# *gst-inspect-1.0 --version*
I get below result:
gst-inspect-1.0 version 1.10.4
GStreamer 1.10.4
http://www.redhat.com

Then I try this command (it works in windows):
#*gst-launch-1.0 udpsrc address=127.0.0.1 port=12001 ! tsdemux
parse-private-sections=TRUE ! h264parse ! avdec_h264 ! avenc_mpeg2video !
mpegtsmux alignment=7 ! udpsink host=127.0.0.1 port =15001 sync=false
async=false*
I get this error:
WARNING: erroneous pipeline: no element "avdec_h264"

I try to inspect it:
#* gst-inspect-1.0 avdec_h264*
No such element or plugin 'avdec_h264'

When I try to inspect: tsdemux, it works, and shows detailed info. When I
inspect avenc_mpeg2video, it also does not find the plugin. Anything else I
need to install? What is the next step to check? Thanks.
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