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

[Flavio Alves]

I believe I have found a solution.

I implemented a strategy where my circular buffer keeps waiting until a new
frame arrives, similar to a blocking socket read operation. Then everything
goes well.

Then I do not need to worry about the variables anymore, just like expected
from a DeviceSource.

Best regards,

Flavio

On Thu, 18 Apr 2024 at 16:07, Flavio Alves <
flavio.alves at vitalintelligencedata.com> wrote:

> Hello,
>
> I'm working on a live streaming service using Live55 using an Nvidia
> Jetson Nano board.
>
> I'm capturing the frames from an USB webcam and I am encoding using
> Nvidia's hardware encoder. Then Live555 is responsible for streaming this
> capture using RTSP.
>
> The Nvidia software api to use the encoder uses some threads, and I was
> unable to use it in a single application. I implemented 2 applications: the
> RTSP server and the Capture application.
>
> The communication between them is shared memory, in Linux. I implemented a
> circular buffer on this shared memory to place the encoded frames, which
> are seen by the RTSP server application.
>
> I created custom classes for MediaSession (from
> OnDemandServerMediaSubsession) and DeviceSource (from FramedSource).
>
> The software is almost working. I had issues with adding SPS and PPS and
> timestamps on the encoded frame which seems to be fine.
>
> But what is happening now is that the applications seems to be ignoring
> the fDurationInMicroseconds and/or the fPresentationTime values ... and the
> framerate does not seem to be respected when streaming. The video showing
> up is very fast.
>
> I would like to ask for any advice about how to properly address this
> problem.
>
> Best regards,
>
> Flavio
>
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