gst_parse_error: no element "vaapih265dec"

Sat Nov 5 22:30:47 UTC 2022

OK. Looking with the GST_DEBUG=2,vaapi*:5 results. The two Gstreamer calls
are Gst.init(None) and
Gst.parse_launch with this pipeline:

souphttpsrc location="http://localhost/foo.m3u8" ! parsebin name=pb ! queue
! vaapih265dec !
video/x-raw,format=P010_10LE ! queue max-size-bytes=100663300 ! kmssink
connector-id=308 plane-id=31
pb. ! queue ! fdkaacdec ! scaletempo ! volume volume=0.9 ! alsasink

The Gst logging output is (from system log..., this is running as a
service):

*Nov 05 15:08:09 player0 systemd[682]: Queued start job for default target
Main User Target.*

Nov 05 15:08:19 player0 python3[716]: 0:00:10.017282911   716
0x562e9953f890 INFO                  python lvplayer.py:74:__init__: Start
init config: '/media/views/content/config/nuc.json'
Nov 05 15:08:21 player0 python3[716]: 0:00:11.516405122   716
0x562e9953f890 ERROR           GST_PIPELINE
subprojects/gstreamer/gst/parse/grammar.y:499:gst_parse_element_make: no
element "vaapih265dec"
Nov 05 15:08:21 player0 python3[716]: 0:00:11.516417510   716
0x562e9953f890 ERROR           GST_PIPELINE
subprojects/gstreamer/gst/parse/grammar.y:1118:priv_gst_parse_yyparse: link
has no sink [source=@0x562e99792190]
Nov 05 15:08:21 player0 python3[716]: 0:00:11.516439058   716
0x562e9953f890 ERROR           GST_PIPELINE
subprojects/gstreamer/gst/parse/grammar.y:1118:priv_gst_parse_yyparse: link
has no source [sink=@0x562e99792490]
Nov 05 15:08:21 player0 python3[716]: Traceback (most recent call last):
Nov 05 15:08:21 player0 python3[716]:   File
"/home/player/lvplayer/src/lvplayer/lvplayer.py", line 948, in <module>
Nov 05 15:08:21 player0 python3[716]:     sys.exit(main(sys.argv))
Nov 05 15:08:21 player0 python3[716]:   File
"/home/player/lvplayer/src/lvplayer/lvplayer.py", line 938, in main
Nov 05 15:08:21 player0 python3[716]:     player = Player(args[1])
Nov 05 15:08:21 player0 python3[716]:   File
"/home/player/lvplayer/src/lvplayer/lvplayer.py", line 112, in __init__
Nov 05 15:08:21 player0 python3[716]:     self._player =
Gst.parse_launch(PIPELINE)
Nov 05 15:08:21 player0 python3[716]: gi.repository.GLib.GError:
gst_parse_error: no element "vaapih265dec" (1)

Nov 05 15:08:21 player0 systemd[682]: player_service.service: Main process
exited, code=exited, status=1/FAILURE
Nov 05 15:08:21 player0 systemd[682]: player_service.service: Failed with
result 'exit-code'.
Nov 05 15:08:21 player0 systemd[682]: Failed to start LiquidView Player
Service.
Nov 05 15:08:21 player0 systemd[682]: Reached target Main User Target.
Nov 05 15:08:21 player0 systemd[682]: Startup finished in 12.175s.
Nov 05 15:08:26 player0 systemd[682]: player_service.service: Scheduled
restart job, restart counter is at 1.
Nov 05 15:08:26 player0 systemd[682]: Stopped LiquidView Player Service.
*Nov 05 15:08:26 player0 systemd[682]: Starting LiquidView Player
Service...*
Nov 05 15:08:27 player0 python3[1857]: Loading LiquidView Player version
lvplayer at 9aa933d3c03040baa072d02e28942744b70d5c38
Nov 05 15:08:27 player0 python3[1858]: 0:00:00.002161960  1858
0x560ca588c830 INFO                   vaapi
gstvaapiutils.c:95:gst_vaapi_log: VA-API version 1.14.0
Nov 05 15:08:27 player0 python3[1858]: 0:00:00.002183680  1858
0x560ca588c830 INFO                   vaapi
gstvaapiutils.c:95:gst_vaapi_log: Trying to open
/usr/lib/x86_64-linux-gnu/dri/iHD_drv_video.so

It then relaunches the service, and this time after Gst.init(None), there
are a whole raft of Vaapi calls before "Start init config", and it
succeeds.  Full log of my player service up until successful launch
attached.

What's the best solution here? Seems pretty reliably unable to start until
the second try, or, maybe, 20 seconds after boot?

-Bill

On Wed, Nov 2, 2022 at 9:17 AM Arun Raghavan <arun at arunraghavan.net> wrote:

> On Mon, 29 Aug 2022, at 10:53 PM, Bill Hofmann via gstreamer-devel wrote:
> > I am building a pipeline using Gst.parse_launch (Python). The pipeline
> is:
> >
> >> souphttpsrc location="http://localhost/foo.m3u8" !
> >> parsebin ! queue ! vaapih265dec !
> >> video/x-raw,format=P010_10LE ! queue max-size-bytes=100663300 ! kmssink
> >
> > After a system boot, my program runs. Some percentage of the time, I
> > receive the error message
> >
> >> gst_parse_error: no element "vaapih265dec"
> >
> > My program is running as a user service, and it retries/restarts (after
> > waiting a few seconds). The second, or in some cases the third time it
> > retries, it works.
> >
> > This is based on a local build (Ubuntu 22) of GStreamer 1.20.  Any
> > thoughts? Are there some system services that need to finish
> > initializing?
>
> Is it possible your /dev/dri/* nodes are coming up after the process
> starts?
>
> Also, it might be worth running with GST_DEBUG=2,vaapi*:5 to see if the
> initial plugin scan reports an error.
>
> -- Arun
>
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