webrtcbin issue

[Vladimir Tyutin]

Hi all,
Is there any response on the issue below?

On Thu, Jan 14, 2021 at 10:35 PM Vladimir Tyutin <vladimir.tyutin at gmail.com>
wrote:

> Hi there,
> I'm trying to restart webrtc gstreamer plugging without restarting the
> whole pipeline. The reason for that is that in pipeline I have capturing to
> ts files that are uploaded to server. So I can't stop whole pipeline but
> only webrtc branch.
> See my pipeline below.
> The steps I do to restart webrtc are the following:
> 1. Add blocking prob on src pads for audio and video queue after tee
> elements
> 2. Once it's blocked I remove video and audio branches elements from
> pipeline together with webrtcbin element and set them to NULL state
> 3. Create webrtcbin and video/audio branched elements and add them to
> pipeline
> 4. Link elements
> 5. Unblock queue src pads.
>
> With this sequence I observe the following issues:
> 1. Sometimes queue src pads are not blocked. I see event from one pad
> about blocking state but not from another.  But I'm waiting both pads
> blocking events to proceed
> 2. When both are blocked. Sometime (very frequently) webrtcbin hangs in
> switching to NULL state. I see it tries to switch all its internal elements
> to NULL state and hangs somewhere inside
> 3. If both previous issues not happened when I start new webrtc session
> audio is not received on client side despite SDP data contains valid audio
> data
>
> Do you have any idea what is the proper way to restart webrtcbin element
> inside pipeline and prepare it to new connection?
>
> Here is my pipeline:
> "webrtcbin name=webrtc " STUN_SERVER_PROP "=" STUN_1 " " STUN_SERVER_PROP
> "=" STUN_2 " " STUN_SERVER_PROP "=" STUN_3 " " \
>                     STUN_SERVER_PROP "=" STUN_4 " " STUN_SERVER_PROP "="
> STUN_5 " " TURN_SERVER_PROP "=" TURN_1 " " \
>                     "mpegtsmux name=fullhdts ! hlssink max-files=100
> target-duration=10 location=/mnt/ramdisk/fullhd_%09d.ts " \
>                     "mpegtsmux name=vgats ! hlssink max-files=100
> target-duration=10 location=/mnt/ramdisk/vga_%09d.ts " \
>                     "v536videosrc sys-init=false device=1 channel=0
> encoder=0 format=H264 width=1920 height=1080 ! video/x-h264,
> stream-format=byte-stream, alignment=au, profile=baseline ! queue !
> h264parse ! fullhdts. " \
>                     "v536videosrc sys-init=false device=1 channel=1
> encoder=1 format=H264 width=640 height=480 ! video/x-h264,
> stream-format=byte-stream, alignment=au, profile=baseline ! tee name=tv !
> queue ! h264parse ! vgats. " \
>                     "alsasrc ! tee name=t ! queue ! avenc_aac ! aacparse !
> fullhdts. " \
>                     "t. ! queue ! avenc_aac ! aacparse ! vgats. " \
>                     "tv. ! queue name=videoqueue leaky=downstream
> max-size-buffers=25 ! rtph264pay name=vrtp ! capsfilter name=vrtpcaps
> caps=" RTP_CAPS_H264 "96 ! webrtc. " \
>                     "t. ! queue name=audioqueue leaky=downstream !
> audioconvert name=aconvert ! opusenc name=opusenc ! rtpopuspay name=artp !
> capsfilter name=artpcaps caps=" RTP_CAPS_OPUS "97 ! webrtc. "
>
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