Missing H.264 decoder but it isn't?

Wed May 23 14:45:31 UTC 2018

The decodebin element seems to be claiming the I don't have a H264 decoder available (see below).
But gst-inspect-1.0 avdec_h264 says it is.
What might be going on here?

Could it be something similar to this old issue?
 http://gstreamer-devel.966125.n4.nabble.com/Missing-element-H-264-decoder-sometimes-for-Raspberry-Pi-td4662003.html

or is my installation genuinely broken somehow?
This is on Debian 9 with good, bad and ugly plugins installed.

GST_DEBUG=3 gst-launch-1.0 -v filesrc location=multi.ts ! tsparse ! tsdemux program_number=17540 ! decodebin caps=audio/x-raw ! audioconvert ! audioresample ! audio/x-raw, rate=8000, channels=1 ! wavenc ! filesink location=cbbc.wav  2>&1 | tee err
Setting pipeline to PAUSED ...
0:00:00.087246734 18349 0x557f3e5cb990 WARN                 basesrc gstbasesrc.c:3491:gst_base_src_start_complete:<filesrc0> pad not activated yet
Pipeline is PREROLLING ...
/GstPipeline:pipeline0/MpegTSParse2:mpegtsparse2-0.GstPad:src: caps = video/mpegts, systemstream=(boolean)true, packetsize=(int)188
/GstPipeline:pipeline0/GstTSDemux:tsdemux0.GstPad:sink: caps = video/mpegts, systemstream=(boolean)true, packetsize=(int)188
0:00:00.094903539 18349 0x557f3e597680 FIXME             mpegtsbase mpegtsbase.c:416:mpegts_base_add_program: Refcounting. Setting twice a PID (0x0010) as known PSI
/GstPipeline:pipeline0/GstDecodeBin:decodebin0.GstGhostPad:sink.GstProxyPad:proxypad0: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)nal
/GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstTypeFindElement:typefind.GstPad:src: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)nal
/GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstH264Parse:h264parse0.GstPad:src: caps = video/x-h264, stream-format=(string)byte-stream, alignment=(string)nal, parsed=(boolean)true
0:00:00.127770575 18349 0x557f3e597680 ERROR                 bcmdec gstbcmdec.c:875:gst_bcm_dec_change_state:<bcmdec0> dev open failed -1
0:00:00.129039704 18349 0x557f3e597680 ERROR                 bcmdec gstbcmdec.c:876:gst_bcm_dec_change_state:<bcmdec0> dev open failed...ret GST_STATE_CHANGE_FAILURE
0:00:00.129498419 18349 0x557f3e597680 WARN               decodebin gstdecodebin2.c:2306:connect_pad:<decodebin0> Couldn't set bcmdec0 to READY
0:00:00.130062166 18349 0x557f3e597680 ERROR                 bcmdec gstbcmdec.c:2374:bcmdec_del_shmem:<bcmdec0> bcmdec_del_shmem:deleted shmem segment ...
DtsGetHWFeatures: Create File Failed
DtsGetHWFeatures: Create File Failed
Running DIL (3.22.0) Version
DtsDeviceOpen: Opening HW in mode 0
DtsDeviceOpen: Create File Failed
Missing element: H.264 decoder
0:00:00.131375083 18349 0x557f3e597680 WARN               decodebin gstdecodebin2.c:4592:gst_decode_bin_expose:<decodebin0> error: no suitable plugins found:
Couldn't set bcmdec0 to READY

ERROR: from element /GstPipeline:pipeline0/GstDecodeBin:decodebin0: Your GStreamer installation is missing a plug-in.
Additional debug info:
gstdecodebin2.c(4592): gst_decode_bin_expose (): /GstPipeline:pipeline0/GstDecodeBin:decodebin0:
no suitable plugins found:
Couldn't set bcmdec0 to READY

ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...

-----Original Message-----
From: gstreamer-devel [mailto:gstreamer-devel-bounces at lists.freedesktop.org] On Behalf Of Adams, Bruce (KMLWG)
Sent: 23 May 2018 14:37
To: Discussion of the development of and with GStreamer
Subject: RE: correct way to decode AAC?

The decodebin element is perhaps a bit of overkill here.
Consider this pipeline:

gst-launch-1.0 -v filesrc location=multi.ts ! tsparse ! tsdemux program_number=17540 ! decodebin ! audioconvert ! audioresample ! audio/x-raw, rate=8000, channels=1 ! wavenc ! filesink location=cbbc.wav

I get the error:

Missing element: H.264 decoder
ERROR: from element /GstPipeline:pipeline0/GstDecodeBin:decodebin0: Your GStreamer installation is missing a plug-in.
Additional debug info:
gstdecodebin2.c(4592): gst_decode_bin_expose (): /GstPipeline:pipeline0/GstDecodeBin:decodebin0:

There are patent issues with H264 but yes it would be nice to fix my install.

My point though is that I don't care about the video in this pipeline.
I really just want an "OR" element

Try decoding using A or B
E.g.

Src = audio/mpeg
Sink = audio/x-raw

If src=AAC use avdec_aac
If src=MPEG use faad

Of course the decodebin element gives us that and more
but is there a standard way of doing this or a case for something leaner?

Regards,

Bruce.

-----Original Message-----
From: gstreamer-devel [mailto:gstreamer-devel-bounces at lists.freedesktop.org] On Behalf Of Adams, Bruce (KMLWG)
Sent: 23 May 2018 12:57
To: Discussion of the development of and with GStreamer
Subject: RE: correct way to decode AAC?

What is the purpose of the queue in that pipeline?

-----Original Message-----
From: gstreamer-devel [mailto:gstreamer-devel-bounces at lists.freedesktop.org] On Behalf Of new baby
Sent: 23 May 2018 12:54
To: gstreamer-devel at lists.freedesktop.org
Subject: RE: correct way to decode AAC?

Found the BEST way Directly convert .ts to .wav file like this ...
Hope it solves all your worries

*gst-launch-1.0 filesrc location=Transformers1080p.ts ! queue ! decodebin  !
audioconvert ! wavenc ! filesink location=file.wav *

-----
adi
--
Sent from: http://gstreamer-devel.966125.n4.nabble.com/
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