[vlc-devel] Re: [Patch] RTP reordering - dropping of old/duplicate packets

[braymond at echostorm.net]

I've worked in the VTC community for a long time and although long delays
are bad a small smount of buffering can smooth what would be an unplayable
stream into something usable by handling some jitter and out of order
packets. Like you say buffering can be bad, I can however see a
configurable static buffer being useful, or even optionally the same kind
of dynamic RTP buffer used in most H.323 stacks.

Generally a 100-200ms buffer is enough to smooth out minor troublespots
and most people won't even notice anything like that, but it doesn't have
to be used.

- Brian

> Be careful about anything reordering RTP -- the whole idea is Real Time --
> adding buffers is bad juju for people who rely on it to be just that.
>
> -----Original Message-----
> From: vlc-devel-bounce at videolan.org [mailto:vlc-devel-bounce at videolan.org]
> On Behalf Of Marian Durkovic
> Sent: Thursday, September 29, 2005 10:10 AM
> To: vlc-devel at videolan.org
> Subject: [vlc-devel] [Patch] RTP reordering - dropping of old/duplicate
> packets
>
> Hi all,
>
>   I've added a bit of code to the UDP/RTP input, which assures that old or
> duplicate RTP packets are trashed. When the network performs packet
> reordering, only one discontinuity happens instead of 3 before - since the
> old packet is trashed. If multiple copies of the same packet are received,
> only one is used and all the others are trashed.
>
>   This is still not the full solution, since in case of packet reordering
> this code is not able to restore the correct order and still creates one
> discontinuity. But to avoid this, some kind of buffer needs to be
> implemented, which would be able to hold the early packets until the
> correct
> one arrives.
>
>   Please find the patch in the attachment.
>
>
> 	With kind regards,
>
> 		M.
>
> --------------------------------------------------------------------------
> ----                                                                  ----
> ----   Marian Durkovic                       network  manager         ----
> ----                                                                  ----
> ----   Slovak Technical University           Tel: +421 2 524 51 301   ----
> ----   Computer Centre, Nam. Slobody 17      Fax: +421 2 524 94 351   ----
> ----   812 43 Bratislava, Slovak Republic    E-mail/sip: md at bts.sk    ----
> ----                                                                  ----
> --------------------------------------------------------------------------
>
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