Broadcast MPEG-PS Stream over RTP with Specific Payload Type in MPEG using GStreamer

General Discussion
1

Broadcasting an MPEG Program Stream (PS) over RTP using GStreamer. I need to ensure that the RTP packets use a specific payload type (96). Below is the pipeline I am using for broadcasting:

gst-launch-1.0 filesrc location=file_name.mpg ! queue ! mpegvideoparse ! mpegpsmux ! rtpgstpay pt=96 ! udpsink host=239.202.11.95 port=5002

Stream information-

image
image800×634 62.8 KB

Reciver side -

gst-launch-1.0 udpsrc port=5002 ! application/x-rtp,media=video,clock-rate=90000,payload=96 ! rtpjitterbuffer ! rtph264depay ! autovideosink

Issues Encountered:

(gst-launch-1.0:29581): GStreamer-CRITICAL **: 16:01:48.041: gst_segment_to_running_time: assertion 'segment->format == format' failed
0:00:01.206370290 29581 0x5cfbd2821180 WARN               mpegpsmux mpegpsmux.c:421:mpegpsmux_queue_buffer_for_stream:<mpegpsmux0:pad0> got DTS without PTS
(gst-launch-1.0:29581): GStreamer-CRITICAL **: 16:01:48.042: gst_segment_to_running_time: assertion 'segment->format == format' failed
^Chandling interrupt.
Interrupt: Stopping pipeline ...
Execution ended after 0:00:01.190651279
Setting pipeline to NULL ...
Freeing pipeline ...

Another gstreamer pipeline for ps stream broadcasting.

gst-launch-1.0 filesrc location=file_name.mpg ! mpegvideoparse ! rtpmpvpay pt=96 ! udpsink host=239.202.11.95 port=5002

The receiver side is not able to receive the stream (Using gstreamer pipeline).

Output using ffplay -

image
image636×519 37.5 KB

GStreamer Version: 1.24

Any insights, suggestions, or examples of similar pipelines that work would be greatly appreciated. Thank you!

2

You’re using rtpgstpay or rtpmpvpay on the sender, and rtph264depay on the receiver. That can’t work. You need to use compatible payloaders and depayloaders.

Also you’re putting MPEG-2 into the stream (either in MPEG-PS container or plain elementary stream) but try to get H264 out of the stream. They’re different codecs.

3

I want to broadcast using the MPEG-2 format, not H264. Is this feasible with my current setup, and what would be the best approach to ensure compatibility?

4

MPEG-2 video elementary stream, or an MPEG-PS stream (that might contain MPEG-2 video and maybe audio too)? Over RTP or just as is?

5

MPEG-PS stream
only video
I want to set the payload.

6

There’s no RTP payloader for MPEG-PS in GStreamer, only a depayloader (rtpmp1sdepay). You’d have to write (and ideally contribute) a payloader for that, or use a different format.

If it’s video only, you could use rtpmpvpay and rtpmpvdepay which would handle a MPEG-2 video elementary stream.

1 Like
7

Also, since the file is an MPEG-PS container you should use filesrc ! mpegpsdemux ! mpegvideoparse, just processing it with an mpegvideoparse might somewhat work if you’re lucky and extract bits of the MPEG-2 video elementary stream at least, but you might get other garbage in between or miss out on data, depends a bit on how the file is muxed.

8

This is not an answer if your question was about streaming MPEG-PS.
Though, if your use case is just streaming the video content with ability to set payload, as workaround you may stream MP2 TS over RTP.

I just made a quick mpeg ps file (using MPEG-2 System Stream) and the following seems working:

Sender:

gst-launch-1.0 filesrc location=mpeg_ps.mpg ! mpegpsdemux ! mpegvideoparse ! mpegtsmux ! rtpmp2tpay pt=97 ! udpsink host=127.0.0.1 port=5002

Receiver:

gst-launch-1.0 udpsrc address=127.0.0.1 port=5002 ! application/x-rtp,encoding-name=MP2T,clock-rate=90000,payload=97 ! rtpjitterbuffer latency=0 ! rtpmp2tdepay ! decodebin ! autovideoconvert ! autovideosink

Here using dynamic payload 97 instead of static payload 33 for RTP/MP2T.
Here streaming to localhost, for UDP over LAN you may have to use higher latency.