GStreamer + pcap SIP call

[Nathan Stratton]

I use:

gst-launch-1.0 filesrc location=out.pcap ! pcapparse dst-port=24384
caps="application/x-rtp,media=(string)video, clock-rate=(int)90000,
encoding-name=(string)VP8-DRAFT-IETF-01, payload=(int)96" ! rtpvp8depay !
webmmux ! filesink location=out.webm

><>
Nathan Stratton
Founder, CTO
Vocinity, Inc.


On Fri, Jun 4, 2021 at 6:58 AM Жаров Александр Николаевич via
gstreamer-devel <gstreamer-devel at lists.freedesktop.org> wrote:

> Hi all,
>
>
>
> I am using GStreamer to create a video file from a pcap dump file that
> contains RTP traffic of SIP calls (2 or 2+ legs).
>
>
>
> For example,
>
> “call123-media.pcap” with 2 legs contains only SIP call media (OPUS + VP8
> RTP packets).
>
> Pcap captured on one server.
>
> Every leg has 1 audio + 2 video (videoIN + videoOUT) streams.
>
>
>
> Streams start and end at the same time (after trimming the pcap file).
>
>
>
> I am using the following pipeline for converting:
>
> *gst-launch-1.0 videomixer name=m background=1 \*
>
> *                sink_0::xpos=0 sink_0::ypos=0 sink_0::width=640
> sink_0::height=480 \*
>
> *                sink_1::xpos=640 sink_1::ypos=0 sink_1::width=640
> sink_1::height=480 ! queue ! x264enc tune=zerolatency pass=17 bitrate=768 !
> queue \*
>
> *                ! mp4mux name=avMux faststart=true ! queue ! filesink
> location=call123-media.mp4 \*
>
> *                rtpbin name=rtpbin \*
>
> *                filesrc location=call123-media.pcap ! queue ! tee
> name=pcapTee \*
>
> *                pcapTee. ! queue ! pcapparse src-port=16242 !
> application/x-rtp,media=audio,clock-rate=48000,encoding-name=OPUS ! rtpbin.
> \*
>
> *                pcapTee. ! queue ! pcapparse src-port=17234 !
> application/x-rtp,media=audio,clock-rate=48000,encoding-name=OPUS ! rtpbin.
> \*
>
> *                pcapTee. ! queue ! pcapparse src-port=16268 !
> application/x-rtp,media=video,clock-rate=90000,encoding-name=VP8 ! rtpbin.
> \*
>
> *                pcapTee. ! queue ! pcapparse src-port=17254 !
> application/x-rtp,media=video,clock-rate=90000,encoding-name=VP8 ! rtpbin.
> \*
>
> *                \*
>
> *                rtpbin. ! rtpjitterbuffer ! rtpopusdepay ! opusdec !
> audioconvert ! avenc_aac ! avMux.audio_0 \*
>
> *                rtpbin. ! rtpjitterbuffer ! rtpopusdepay ! opusdec !
> audioconvert ! avenc_aac ! avMux.audio_1 \*
>
> *                rtpbin. ! rtpjitterbuffer ! rtpvp8depay ! vp8dec !
> videoscale ! video/x-raw,width=640,height=480 ! m. \*
>
> *                rtpbin. ! rtpjitterbuffer ! rtpvp8depay ! vp8dec !
> videoscale ! video/x-raw,width=640,height=480 ! m.*
>
>
>
>
>
> As a result, I get two video streams, where the first is not started
> simultaneously with the second.
>
>
>
> I am getting following results:
>
>    1. the first stream starts 5 seconds after the start of the second (5
>    seconds of black screen)
>    2. the second stream ends 5 seconds after the end of the first
>    3. video streams are not synchronous
>
>
>
> What wrong with my pipeline?
>
> How can I fix that?
>
>
>
> I tried adding queues but it didn't help.
>
>
>
> --
>
> Thanks in advance,
>
> *Alexander*
>
>
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>
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