how to create proper HLS pipeline

[Andres Gonzalez]

Thanks for your response Chris.

I tried your suggestion:

gst-launch-1.0 udpsrc port=50000 caps="video/mpegts,systemstream=true" !
hlssink target-duration=5 playlist-location="playlist.m3u8"
location=segment.%03d.ts

This pipeline is operational, however, it does not create the playlist and
just generates a single segment file, and it keeps growing and growing.  I
think the pipeline needs to know something about the video, otherwise how
does it know if it has enough video in the segment file to match the
specified target duration?

In my application, I am using hlssink2 for the pipeline that is generating
a new video stream (with appsrc, encoder, etc). But this pipeline has a
udpsrc and so there isn't an encoder in the pipeline. That is the reason I
am using hlssink instead of hlssink2 for this pipeline.

-Andres






On Mon, Sep 20, 2021 at 3:14 PM Chris Wine via gstreamer-devel <
gstreamer-devel at lists.freedesktop.org> wrote:

> Hi Andres,
>
> I believe hlssink takes an mpeg transport stream, so you don't need to
> have the tsdemux element in there unless you need to do something else to
> the streams before remuxing them and sending them to hlssink. So maybe just
> "udpsrc ! hlssink" (with properties of course) will give you want you're
> looking for.
>
> For making sure the caps are correct, you should just be able to set the
> "caps" property on udpsrc:
> udpsrc caps="video/mpegts,systemstream=true"
>
> If you already have separate audio and video streams, I'd use hlssink2
> which does the mpegts muxing internally.
>
> --Chris
>
> On Mon, Sep 20, 2021 at 4:00 PM Andres Gonzalez via gstreamer-devel <
> gstreamer-devel at lists.freedesktop.org> wrote:
>
>> Just some additional info.  I am using gst-launch just to figure out what
>> the appropriate elements should be. I have a C++ app that I develop where I
>> code up the pipeline for my application. But since I am not even sure which
>> elements should be in the pipeline, I am experimenting around with creating
>> the pipeline with gst-launch.
>> Thanks,
>> -Andres
>>
>> On Mon, Sep 20, 2021 at 1:49 PM Andres Gonzalez <
>> andres.agoralabs at gmail.com> wrote:
>>
>>> Hi,
>>> I have a question about creating an HLS pipeline.  I am receiving a
>>> MPEG-TS UDP stream and I want to create a pipeline that will receive the
>>> UDP TS stream, and then create/publish  a corresponding HLS stream. For
>>> example, something like this:
>>>
>>> gst-launch-1.0 udpsrc port=50000 ! tsdemux ! hlssink playlist-root=
>>> http://192.168.0.100:8080 location=segment.%03d.ts
>>>
>>> This actually works and receives the UDP/TS stream and starts to
>>> generate the segment_000.ts file.  But it never creates the playlist file
>>> and keeps adding to the segment_000.ts file.
>>>
>>> I am assuming that I need to provide some caps information about the
>>> video coming in on the UDP/TS stream but I am not sure how to do that.  So
>>> could someone tell me what the pipeline should consist of to get this
>>> working?
>>>
>>> Thanks,
>>> -Andres
>>>
>>
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