[Live-devel] Help with live streaming h.264 frames

[Flavio Alves]

Hi Ross,

On Wed, 24 Apr 2024 at 19:26, Ross Finlayson <finlayson at live555.com> wrote:

>
>
> > On Apr 24, 2024, at 1:46 PM, Flavio Alves <
> flavio.alves at vitalintelligencedata.com> wrote:
> >
> > My first implementation uses the approach you mentioned. I implemented
> it using x264 and it worked fine.
> >
> > But my requirement is to use the Nvidia Jetson Nano hardware encoder.
> Nvidia provides an API to handle the encoder. This API uses threads for the
> encoder and select() for V4L communication. On my implementation, when I
> executed everything, the Live555 worked fine and the Encoder thread got
> stuck, because the use of the select() is also blocking.
>
> I’m not sure I see the problem here.  Suppose you have two threads - one
> for your encoder (that uses your Nvidia API), and another for the server
> (that uses the LIVE555 API).  Both threads are event-driven (using
> “select()”).  Set up your encoder thread to call “select()” (and thus
> block) on your input socket (for your encoder), to call a handler function
> whenever there’s new data (presumably, an encoded NAL unit) available to
> read on this socket.  This handler function would call “triggerEvent()”
> (the only LIVE555 function that can be called by a non-LIVE555 thread), to
> signal the LIVE555 thread of the availability of new data.
>

Probably it was something I have done wrong.

I rebuilt here, using the approach you describe previously and now I have
everything working as it should. I'm using the 2+ threads approach that you
have described above.


>
> In other words, both threads are blocking, but only until an event occurs
> - which the thread should then handle.
>
> The other possibility is to use just a single (LIVE555) thread, and do all
> event handling using LIVE555.  You could handle events on your encoder
> socket by calling (the LIVE555 function) “setBackgroundHandling()” (you can
> see several examples of this in the “liveMedia” directory.  In this case,
> you would not call “select()” at all (because the LIVE555 event loop
> already does that for you).
>
> But I don’t know anything about your "Nvidia Jetson multimedia API”. so I
> might be completely wrong here…
>

It is not mine ... it is Nvidia's:
https://docs.nvidia.com/jetson/l4t-multimedia/index.html :-)

Thank you very much.

Best regards,

Flavio


>
>
> Ross Finlayson
> Live Networks, Inc.
> http://www.live555.com/
>
>
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