RTSP/SRTP in gstreamer (MIKEY vrl2rtspserver)

Manikandan Valaguru via gstreamer-devel <[email protected]> Thu, 27 Mar 2025 06:24:19 +0000
Newsgroups gmane.comp.video.gstreamer.devel
Message-ID <KL1PR03MB81175F2448A272160942A6BFB5A12@KL1PR03MB8117.apcprd03.prod.outlook.com> 
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	boundary="_000_KL1PR03MB81175F2448A272160942A6BFB5A12KL1PR03MB8117apcp_"

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Hi,
I am currently working with a custom v4l2rtspserver built on Live555, aimin=
g to enable RTSPS (RTSP over TLS) and SRTP (Secure RTP) for secure video st=
reaming. My objective is to stream encrypted video and successfully decode =
it in GStreamer.

Based on my understanding:

    RTSPS encryption and decryption rely on TLS certificates.

    SRTP requires a decryption key, which can be extracted from the MIKEY d=
ata in the SDP (Session Description Protocol) of the RTSP response.

    Using this key, I need to construct a GStreamer pipeline to decrypt SRT=
P packets.

Could you confirm if this approach is correct?

Currently, I am extracting the SRTP key from the SDP session and embedding =
it into the GStreamer pipeline as follows:

GST_DEBUG=3D3 gst-launch-1.0 rtspsrc location=3Drtsps://econ:[email protected]=
.23:5005/routecam tls-validation-flags=3D4 protocols=3Dudp \
    ! application/x-srtp, srtp-key=3Da053ace0edcaba09192bff35fa01da6170317c=
d36af12b87be015f416701, \
      srtp-cipher=3Daes-128-icm, srtp-auth=3Dhmac-sha1-80, roc=3D0 \
    ! srtpdec \
    ! rtph264depay \
    ! avdec_h264 \
    ! xvimagesink -v

However, I am encountering issues during playback. I have attached the erro=
r logs and MIKEY data for reference. Could you please review them and let m=
e know if I am missing anything?

Looking forward to your insights.

Regards,
Manikandan
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--_000_KL1PR03MB81175F2448A272160942A6BFB5A12KL1PR03MB8117apcp_
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
<style type=3D"text/css" style=3D"display:none;"> P {margin-top:0;margin-bo=
ttom:0;} </style>
</head>
<body dir=3D"ltr">
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
Hi,<br>
I am currently working with a custom v4l2rtspserver built on Live555, aimin=
g to enable RTSPS (RTSP over TLS) and SRTP (Secure RTP) for secure video st=
reaming. My objective is to stream encrypted video and successfully decode =
it in GStreamer.</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
Based on my understanding:</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
&nbsp; &nbsp; RTSPS encryption and decryption rely on TLS certificates.</di=
v>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
&nbsp; &nbsp; SRTP requires a decryption key, which can be extracted from t=
he MIKEY data in the SDP (Session Description Protocol) of the RTSP respons=
e.</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
&nbsp; &nbsp; Using this key, I need to construct a GStreamer pipeline to d=
ecrypt SRTP packets.</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
Could you confirm if this approach is correct?</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
Currently, I am extracting the SRTP key from the SDP session and embedding =
it into the GStreamer pipeline as follows:</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
GST_DEBUG=3D3 gst-launch-1.0 rtspsrc location=3Drtsps://econ:[email protected]=
.23:5005/routecam tls-validation-flags=3D4 protocols=3Dudp \</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
&nbsp; &nbsp; ! application/x-srtp, srtp-key=3Da053ace0edcaba09192bff35fa01=
da6170317cd36af12b87be015f416701, \</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
&nbsp; &nbsp; &nbsp; srtp-cipher=3Daes-128-icm, srtp-auth=3Dhmac-sha1-80, r=
oc=3D0 \</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
&nbsp; &nbsp; ! srtpdec \</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
&nbsp; &nbsp; ! rtph264depay \</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
&nbsp; &nbsp; ! avdec_h264 \</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
&nbsp; &nbsp; ! xvimagesink -v</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
However, I am encountering issues during playback. I have attached the erro=
r logs and MIKEY data for reference. Could you please review them and let m=
e know if I am missing anything?</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
Looking forward to your insights.<br>
<br>
Regards,</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
Manikandan</div>
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sibility for any loss or damage arising from the use of this email or attac=
hment.
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