[linux-dvb] Re: DVB-H information

Stéphane Esté-Gracias sestegra at free.fr
Tue Mar 6 21:16:02 CET 2007


Le mardi 6 mars 2007 16:43, Francesco Schiavarelli a écrit :
> Stéphane Esté-Gracias wrote:
> >>> I found on Internet a free application to extract PES or ES from a TS,
> >>> but don't know how I can 'de-packetize' the RTP/UDP/IP stack to
> >>> visualize the raw H.264 stream. Do you know application in order to do
> >>> it?
> >>
> >> I used dvbnet apps (available with Linux DVB) to receive datagrams from
> >> TS on a virtual net interface and routing to a multicast group.
> >> Then you should be able to dump the H.264 ES with mplayer,
> >> I used VLC to watch audio and video.
> >>
> >> regards,
> >> Francesco
> >
> > Hello Francesco,
> >
> > I've tried without any succes to read DVB-H streams throught dvbnet and
> > VLC. I only use tcpdump to extract packets from dvbnet interface.
>
> To get the ESG I've done the following:
> 1 - Tune and create dvb network interface with dvbnet on the ESG pid
> 2 - Bring up dvb0_0 in promisc mode (otherwise won't work)
> 3 - Start a multicast routing daemon to route packet to eth0
> 4 - Receive ALC/FLUTE packets to reassemble ESG using bootstrap
> 5 - Extract SDP file from ESG
>
> In 3) I used smcroute as I had problems with mrouted.
> In 4) I used MAD-FLUTE receiver
> In 5) you can have the SDP inspecting ESG fragments with a hex editor
>
> To get A/V you need the SDP and then again:
> 1 - Tune and create dvb network interface with dvbnet on the A/V pid
> 2 - Bring up dvb0_0 in promisc mode (otherwise won't work)
> 3 - Start a multicast routing daemon to route packet to eth0
> 4 - Start VLC with the given SDP and enjoy your TV!

Thank you for this procedure :)

> > For your information, I've started (first step) to write a library to
> > decode ESG in order to obtain SDP (aka PMT like in DVB-H systems)
> >
> > Please see DVB-APPS repository for LIBESG :
> > http://linuxtv.org/hg/dvb-apps?mf=8b37590c8695;path=/lib/libesg/;style=gi
> >tweb
>
> Very good!
> I hacked in some c code to parse ESG and extract SDP files.
> It's ugly, incomplete and mostly unreadable code, but works here.
> I'll be happy to share it, you are warned :)

Why not :) !
My code is only a library to parse most of ESG fragments (in LGPL).
I wanted to code application against my library, but I have no time yet.

Stephane


> regards,
> Francesco





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