[Live-devel] H264VideoStreamDiscreteFramer vs H264VideoStreamFramer vs other

[James Norris]

Ah so it effects the SDP description, I'll check what VLC thinks the stream
is.

You've got it the other way round, when I include the startcode it works &
VLC displays (but I get warnings in live555), when it's missing (& NALs are
broken into pieces) VLC will not playback but live555 is happy.  In summary,
VLC will not display the stream unless I include the startcode to the
discrete framer.  Surely I'm not the only one with these symptoms?

I might try checking the RTP stream at a lower level, see what's going on
with the startcodes, don't know what I'll do with that information but
hopefully will shed some light on how a non-standards-compliant RTP packet
can be shown in VLC.

Thanks again,
James



On Wed, Jun 8, 2011 at 3:22 PM, Ross Finlayson <finlayson at live555.com>wrote:

>  Thanks Ross, as I said though in that case VLC cannot decode the stream,
>> it gives "waiting for SPS/PPS" messages then times out.
>> In what sense will the framer not work correctly with the start code?  In
>> my tests it seems to be working well, apart from the warnings.
>>
>
> I don't know how much clearer I can make this:
>
> If you're using "H264VideoStreamDiscreteFramer", then the NAL units that
> you feed to it MUST NOT begin with the 00000001 start code.  If you do this,
> you will end up with a non-standards-compliant RTP packet (which receiving
> clients might not understand), and also our server code will not recognize
> SPS and PPS NAL units - when they occur.  We need to do this in order to be
> able to generate proper configuration information in the stream's SDP
> description.
>
> You've already noticed that VLC does not decode your stream if you include
> the start codes.  So don't include them.
>
> --
>
> Ross Finlayson
> Live Networks, Inc.
> http://www.live555.com/
> _______________________________________________
> live-devel mailing list
> live-devel at lists.live555.com
> http://lists.live555.com/mailman/listinfo/live-devel
>
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