> On Mar 31, 2023, at 4:45 AM, Milos Jakovljevic
> <[email protected]> wrote:
>
> Hi everyone,
>
> I'm receiving a 4K HEVC stream from the remote server. All the NAL units seem
> to be fragments but for some reason NAL type is always either 1 or 19 apart
> from Non-VCL types.
>
> I'm trying to figure out how I would recognize if its a fragment ? Am i
> missing something?
Your question was rather vague - you don’t explain exactly how you’re using the
“LIVE555 Streaming Media” code. But from the context, I presume that you’re
using it as a RTSP client, rather than as a RTSP server.
Note that the LIVE555 RTSP/RTP implementation automatically handles
fragmentation/defragmentation of H.264 (and H.265) NAL units into RTP packets -
at both the server end and the client end. As a programmer, you don’t need to
concern yourself with RTP fragmentation. The LIVE555 RTSP client code will
deliver complete NAL units - so that’s what you should be receiving: Complete
NAL units (which might include video frame ‘slices’ - not necessarily complete
video frames).
A reminder that if you’re testing the LIVE555 RTSP client implementation
against a remote RTSP stream (whether or not its server is also written using
the LIVE555 code), then the best way to begin is using our command-line
“openRTSP” RTSP client; see
http://live555.com/openRTSP/
(You can also use VLC - as it uses the LIVE555 code (when acting as a RTSP
client) - but the “openRTSP” code is easier to understand.)
Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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