[linux-dvb] Re: More problems with demuxing TS stream, and reading two pids at once.

[Johannes Stezenbach <js@convergence.de>]

On Wed, Nov 06, 2002 at 10:42:02AM +1100, Mike Doyle wrote:
> 
> Have emailed earlier about problems with two or more filter, with output set 
> to "DMX_OUT_TAP".  When reading, the first filter would stop reading once the 
> second filter had been set up, and the second filter would read data, which 
> is a mix of the data from both filters.

AFAIK the driver bug is still not fixed in CVS. Did you try
the patch Matt Davis posted?
http://www.linuxtv.org/mailinglists/linux-dvb/2002/11-2002/msg00020.html
(The patch may need to be updated for the current CVS.)

> Suggestions given to me were to use DMX_OUT_TS_TAP, and then demux the TS 
> myself, which is fairly trivial (each TS packet being 188bytes of data).
> 
> But it seems the same problem is following me.  It seems data from both 
> filters get mixed in with each other. I have set up a program to search 
> through all the data, looking for TS packet  headers of the particular PIDS I 
> am looking for, and I often find a new header halfway through the last 
> packet.

It is the intention of DMX_OUT_TS_TAP to create a mix of all
filtered data for output on the dvr device. This is convenient
for recording a partial TS with just video and audio for one
service, hence the name of the dvr device.


Regards,
Johannes


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