[streaming] Re: Big data blocks to network from videoinput?
Marian Durkovic
md at bts.sk
Sat Mar 1 11:15:59 CET 2003
On Fri, Feb 28, 2003 at 11:25:13AM +0100, Christophe Massiot wrote:
> On Fri, Feb 28, 2003, Marian Durkovic wrote:
>
> > > > doing some tests with live streaming from MPEG2 encoder board I've run
> > > > into following problem:
> > > >
> > > > Encoder board outputs data only once per frame (i.e. once every 40 ms).
> > > > When it outputs I-frame (every 15-th block of data), the data block could be
> > > > as large as 100 KB or even more.
> > >
> > > Does your encoder output PS or TS ?
> >
> > It's PS.
>
> Then I know no solution to your problem, as VLS is forced to read each
> PES packet entirely before sending out TS packets. A solution would be to
> increase the buferring on VLS's side, but I have no idea how to do it
> (maybe a VLS developer can help you on this).
Well, not sure if this is a good idea due to MPEG2 nature, but perhaps the
network output (or ts_streamer) could have some mechanism which prevents it
from pushing e.g. 80 IP packets (with size of 1316 bytes each) to the net
at the same moment.
For example, the 4 Mbit/s stream needs to deliver approx. 400 IP packets/s
which means that in optimal situation packet shoud be sent to network every
2.5 miliseconds. Seems the TS streams received from sattelite behave exactly
this way - and thus I have no problem to watch any sat channel on a PC with
10 Mbps connection. However, the stream received from MPEG2 encoder board
(or from file?) ouputs those big blocks of data which is causing problems.
Thanks for any help and/or comments.
With kind regards,
M.
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