srtsrc fails when trying to use in python

Nicolas Dufresne nicolas at ndufresne.ca
Tue Feb 18 22:47:35 UTC 2020


Le mar. 18 févr. 2020 10 h 45, Michael <
michael.riha+gstreamerMailingList at gmail.com> a écrit :

> Hello everybody,
>
> I am experimenting with GStreamer now for a few weeks
> and after putting together some pipeline in the gst-launch-1.0 CLI
> I started using python a few days ago.
>
> Made good progress but I am stuck now with `srtsrc`.
>
> I have a CLI-command inside a docker container which works as expected:
>
> gst-launch-1.0 -v srtsrc uri="srt://:2088" \
> ! tsparse ! tsdemux ! h264parse ! avdec_h264 ! \
> queue ! x264enc byte-stream=true ! h264parse config-interval=-1 ! \
> queue ! matroskamux ! queue leaky=2 ! \
> tcpserversink port=7001 host=0.0.0.0 recover-policy=keyframe
>
> I feed this with FFMPEG outside of the container on port 2088 and play it
> with `ffplay tcp://127.0.0.1:7001` without any problems!
>
> But ... when I rebuild this CLI-command with python (creating elements and
> linking them)
>
> 'srtsrc0'
> srtsrc0->tsparse1
> 'tsparse1'
> tsparse1->tsdemux2
> 'tsdemux2'
> tsdemux2->h264parse3
> 'h264parse3'
> h264parse3->avdec_h2644
> 'avdec_h2644'
> avdec_h2644->queue5
> 'queue5'
> queue5->x264enc6
> 'x264enc6'
> x264enc6->h264parse7
> 'h264parse7'
> h264parse7->queue8
> 'queue8'
> queue8->matroskamux9
> 'matroskamux9'
> matroskamux9->queue10
> 'queue10'
> queue10->tcpserversink11
>
> *Here the diagram:*
>
> [image: srtPipeline.png]
> Bus Messages (reduced):
>
> Received message from -> tcpserversink11
> state changed: (oldstate=<enum GST_STATE_NULL of type Gst.State>,
> newstate=<enum GST_STATE_READY of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> queue10
> state changed: (oldstate=<enum GST_STATE_NULL of type Gst.State>,
> newstate=<enum GST_STATE_READY of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> matroskamux9
> state changed: (oldstate=<enum GST_STATE_NULL of type Gst.State>,
> newstate=<enum GST_STATE_READY of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> queue8
> state changed: (oldstate=<enum GST_STATE_NULL of type Gst.State>,
> newstate=<enum GST_STATE_READY of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> h264parse7
> state changed: (oldstate=<enum GST_STATE_NULL of type Gst.State>,
> newstate=<enum GST_STATE_READY of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> x264enc6
> state changed: (oldstate=<enum GST_STATE_NULL of type Gst.State>,
> newstate=<enum GST_STATE_READY of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> queue5
> state changed: (oldstate=<enum GST_STATE_NULL of type Gst.State>,
> newstate=<enum GST_STATE_READY of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> avdec_h2644
> state changed: (oldstate=<enum GST_STATE_NULL of type Gst.State>,
> newstate=<enum GST_STATE_READY of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> h264parse3
> state changed: (oldstate=<enum GST_STATE_NULL of type Gst.State>,
> newstate=<enum GST_STATE_READY of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> tsdemux2
> state changed: (oldstate=<enum GST_STATE_NULL of type Gst.State>,
> newstate=<enum GST_STATE_READY of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> tsparse1
> state changed: (oldstate=<enum GST_STATE_NULL of type Gst.State>,
> newstate=<enum GST_STATE_READY of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> srtsrc0
> state changed: (oldstate=<enum GST_STATE_NULL of type Gst.State>,
> newstate=<enum GST_STATE_READY of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> pipeline0
> state changed: (oldstate=<enum GST_STATE_NULL of type Gst.State>,
> newstate=<enum GST_STATE_READY of type Gst.State>, pending=<enum
> GST_STATE_PLAYING of type Gst.State>)
> Received message from -> src
> stream status: (type=<enum GST_STREAM_STATUS_TYPE_CREATE of type
> Gst.StreamStatusType>, owner=<__gi__.GstQueue object at 0x7f0e162bdcd0
> (GstQueue at 0x2bae6f0)>)
> Received message from -> queue10
> state changed: (oldstate=<enum GST_STATE_READY of type Gst.State>,
> newstate=<enum GST_STATE_PAUSED of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> src
> stream status: (type=<enum GST_STREAM_STATUS_TYPE_ENTER of type
> Gst.StreamStatusType>, owner=<__gi__.GstQueue object at 0x7f0e162bdcd0
> (GstQueue at 0x2bae6f0)>)
> Received message from -> matroskamux9
> state changed: (oldstate=<enum GST_STATE_READY of type Gst.State>,
> newstate=<enum GST_STATE_PAUSED of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> src
> stream status: (type=<enum GST_STREAM_STATUS_TYPE_CREATE of type
> Gst.StreamStatusType>, owner=<__gi__.GstQueue object at 0x7f0e162bd640
> (GstQueue at 0x2bae3f0)>)
> Received message from -> queue8
> state changed: (oldstate=<enum GST_STATE_READY of type Gst.State>,
> newstate=<enum GST_STATE_PAUSED of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> src
> stream status: (type=<enum GST_STREAM_STATUS_TYPE_ENTER of type
> Gst.StreamStatusType>, owner=<__gi__.GstQueue object at 0x7f0e162bd640
> (GstQueue at 0x2bae3f0)>)
> Received message from -> h264parse7
> state changed: (oldstate=<enum GST_STATE_READY of type Gst.State>,
> newstate=<enum GST_STATE_PAUSED of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> x264enc6
> state changed: (oldstate=<enum GST_STATE_READY of type Gst.State>,
> newstate=<enum GST_STATE_PAUSED of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> src
> stream status: (type=<enum GST_STREAM_STATUS_TYPE_CREATE of type
> Gst.StreamStatusType>, owner=<__gi__.GstQueue object at 0x7f0e162bd0a0
> (GstQueue at 0x2bae0f0)>)
> Received message from -> queue5
> state changed: (oldstate=<enum GST_STATE_READY of type Gst.State>,
> newstate=<enum GST_STATE_PAUSED of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> src
> stream status: (type=<enum GST_STREAM_STATUS_TYPE_ENTER of type
> Gst.StreamStatusType>, owner=<__gi__.GstQueue object at 0x7f0e162bd0a0
> (GstQueue at 0x2bae0f0)>)
> Received message from -> avdec_h2644
> state changed: (oldstate=<enum GST_STATE_READY of type Gst.State>,
> newstate=<enum GST_STATE_PAUSED of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> h264parse3
> state changed: (oldstate=<enum GST_STATE_READY of type Gst.State>,
> newstate=<enum GST_STATE_PAUSED of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> tsdemux2
> state changed: (oldstate=<enum GST_STATE_READY of type Gst.State>,
> newstate=<enum GST_STATE_PAUSED of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> tsparse1
> state changed: (oldstate=<enum GST_STATE_READY of type Gst.State>,
> newstate=<enum GST_STATE_PAUSED of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> src
> stream status: (type=<enum GST_STREAM_STATUS_TYPE_CREATE of type
> Gst.StreamStatusType>, owner=<__gi__.GstSRTSrc object at 0x7f0e162bb870
> (GstSRTSrc at 0x2aca1b0)>)
> Received message from -> srtsrc0
> state changed: (oldstate=<enum GST_STATE_READY of type Gst.State>,
> newstate=<enum GST_STATE_PAUSED of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> pipeline0
> state changed: (oldstate=<enum GST_STATE_READY of type Gst.State>,
> newstate=<enum GST_STATE_PAUSED of type Gst.State>, pending=<enum
> GST_STATE_PLAYING of type Gst.State>)
> Received message from -> src
> stream status: (type=<enum GST_STREAM_STATUS_TYPE_ENTER of type
> Gst.StreamStatusType>, owner=<__gi__.GstSRTSrc object at 0x7f0e162bb870
> (GstSRTSrc at 0x2aca1b0)>)
> Received message from -> pipeline0
> Bus message: 18446744073709551615: <flags GST_MESSAGE_NEW_CLOCK of type
> Gst.MessageType>
> <Gst.Message object at 0x7f0e16488590 (GstMessage at 0x2b9db40)>
> Received message from -> queue10
> state changed: (oldstate=<enum GST_STATE_PAUSED of type Gst.State>,
> newstate=<enum GST_STATE_PLAYING of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> matroskamux9
> state changed: (oldstate=<enum GST_STATE_PAUSED of type Gst.State>,
> newstate=<enum GST_STATE_PLAYING of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> queue8
> state changed: (oldstate=<enum GST_STATE_PAUSED of type Gst.State>,
> newstate=<enum GST_STATE_PLAYING of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> h264parse7
> state changed: (oldstate=<enum GST_STATE_PAUSED of type Gst.State>,
> newstate=<enum GST_STATE_PLAYING of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> x264enc6
> state changed: (oldstate=<enum GST_STATE_PAUSED of type Gst.State>,
> newstate=<enum GST_STATE_PLAYING of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> queue5
> state changed: (oldstate=<enum GST_STATE_PAUSED of type Gst.State>,
> newstate=<enum GST_STATE_PLAYING of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> avdec_h2644
> state changed: (oldstate=<enum GST_STATE_PAUSED of type Gst.State>,
> newstate=<enum GST_STATE_PLAYING of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> h264parse3
> state changed: (oldstate=<enum GST_STATE_PAUSED of type Gst.State>,
> newstate=<enum GST_STATE_PLAYING of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> tsdemux2
> state changed: (oldstate=<enum GST_STATE_PAUSED of type Gst.State>,
> newstate=<enum GST_STATE_PLAYING of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> tsparse1
> state changed: (oldstate=<enum GST_STATE_PAUSED of type Gst.State>,
> newstate=<enum GST_STATE_PLAYING of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
> Received message from -> srtsrc0
> state changed: (oldstate=<enum GST_STATE_PAUSED of type Gst.State>,
> newstate=<enum GST_STATE_PLAYING of type Gst.State>, pending=<enum
> GST_STATE_VOID_PENDING of type Gst.State>)
>
> As soon as I try to connect to `srtsrc` with FFMPEG
> `ffmpeg  -re     -f lavfi     -i "testsrc=size=1920x1080:rate=25"     -f
> lavfi     -i "sine=frequency=800:sample_rate=48000"     -preset:v superfast
>     -pix_fmt yuv420p     -map 0:v     -map 1:a     -c:v libx264 -tune
> zerolatency -profile:v high -preset veryfast  -g 30     -keyint_min 30 -b:v
> 2000k     -c:a aac -ar 48000 -ac 2 -max_muxing_queue_size 1024 -f mpegts
> "srt://:2088"` (which works with the CLI-command above like a charm!!!)
>
> the following is sent to the pipeline-bus:
>
> Received message from -> tsparse1
> Element message: sdt, section=(GstMpegtsSection)NULL;
> Received message from -> tsparse1
> Element message: pat, section=(GstMpegtsSection)NULL;
> Received message from -> tsparse1
> Element message: pmt, section=(GstMpegtsSection)NULL;
> Received message from -> tsdemux2
> Element message: pat, section=(GstMpegtsSection)NULL;
> Received message from -> tsdemux2
> Bus message: 18446744073709551615: <flags GST_MESSAGE_WARNING |
> GST_MESSAGE_EXTENDED | GST_MESSAGE_STREAM_COLLECTION of type
> Gst.MessageType>
> <Gst.Message object at 0x7f0e16488590 (GstMessage at 0x7f0df0002b40)>
> Received message from -> tsdemux2
> Element message: pmt, section=(GstMpegtsSection)NULL;
> Received message from -> srtsrc0
> Error: gst-stream-error-quark: Internal data stream error. (1):
> gstbasesrc.c(3072): gst_base_src_loop ():
> /GstPipeline:pipeline0/GstSRTSrc:srtsrc0:
> streaming stopped, reason not-linked (-1)
>

Not-linked is a precise error in GStreamer. Did you forgot to track
pad-added signal on tsdemux ? Denuxer have sometimes pads, so they need
runtime linking.


> and the python-script is exited.
>
> As I have already done some CLI-> python examples, I am quite sure that
> the pipeline itself is rebuilt correct, but I am still new so I would
> appreciate it very much if you could help me?
>
>
> Thank you in advance
>
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
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