[linux-dvb] RE : nova-t 500, again.

Thierry Lelegard thierry.lelegard at tv-numeric.com
Mon Sep 24 09:58:24 CEST 2007


> That doesn´t by any chance happen to be channels with high bitrate ?

How can a specific service bitrate cause the disconnect since the device (and its driver) passes the complete TS to the software
demux in the kernel? Even if the service has a variable bitrate inside the TS, the TS bitrate remains constant.
 
I experience the same problems with a custom application (not MythTV, Kaffeine, or any TV watching software). My application always
reads the complete TS:
    struct dmx_pes_filter_params filter;
    ...
    filter.pid = 0x2000;                // Means "all PID's"
    filter.input = DMX_IN_FRONTEND;     // Read from frontend device
    filter.output = DMX_OUT_TS_TAP;     // Redirect TS packets to DVR device
    filter.pes_type = DMX_PES_OTHER;    // Any type of PES
    filter.flags = DMX_IMMEDIATE_START; // Start capture immediately
    ioctl (demux_fd, DMX_SET_PES_FILTER, &filter);
    ....
The DTTV TS have all a constant bitrate, although not the same for all TS (depends on FEC).
 
-Thierry

-----Message d'origine-----
De : linux-dvb-bounces at linuxtv.org [mailto:linux-dvb-bounces at linuxtv.org] De la part de Henrik Beckman
Envoyé : samedi 22 septembre 2007 13:50
À : Dan Harper; linux-dvb
Objet : Re: [linux-dvb] nova-t 500, again.


Hi,

That doesn´t by any chance happen to be channels with high bitrate ?

/Henrik


On 9/22/07, Dan Harper < dan at danharper.org <mailto:dan at danharper.org> > wrote: 

Hi Henrik, 

I have a sneaking suspicion that the problem is related to either reception or the content that is being passed down on a particular
channel at a particular time.  I've noticed that attempting to record some of the same shows each week cause the card to disconnect
(on one of my favourite shows too.. grrr). 

This is totally unproven, but I have a suspicion that it's related.

Dan




On 22/09/2007, at 5:51 PM, Henrik Beckman wrote: 


Hi, 

I´m running 2.6.22.1  <http://2.6.22.1> (x86_64) 

I upgraded the kernel  2007-07-16 and haven´t had a disconnect since, until 2007-09-20.
I have been running the kernel source drivers until 2007-09-05 when I upgraded to the lates HG and the dvb-usb-dib0700-03-pre1.fw 
firmware. Suffering the disconnects on the 20 I upgraded firmware to dvb-usb-dib0700-1.10.fw  but suffered to disconnects again the
21.

Nothing has changed in the system the days prior to the disconnects, here is what has changed lately. 

Fall is here, colder and wetter outside, reception may have been changed.
Slightly more uptime on the machine, instead off just waking up and recording it might have been on a few hours and running
playbacks or 
just sitting there instead of just waking up and recording.

I realy thought I had this problem behind me, is there any dual dvb-t card for pci or pci-e that is flawless in linux?

Sep 21 21:20:12 media -- MARK -- 
Sep 21 21:40:12 media -- MARK --
Sep 21 22:00:12 media -- MARK --
Sep 21 22:20:13 media -- MARK --
Sep 21 22:40:13 media -- MARK --
Sep 21 22:59:13 media kernel: [ 9272.837486 ] usb 3-1: USB disconnect, address 2
Sep 21 22:59:13 media kernel: [ 9272.838165] mt2060 I2C write failed
Sep 21 22:59:13 media kernel: [ 9272.846396] hald-addon-keyb[5204] general protection rip:2ad4e99c221b rsp:7fffc17cbf70 error:0


Mythlog is ugly, but points at it being reception based.

I have _a lot_ of 
[mpeg2video @ 0x2b331f003fd0]00 motion_type at 10 23
[mpeg2video @ 0x2b331f003fd0]ac-tex damaged at 5 9
[mpeg2video @ 0x2b331f003fd0]ac-tex damaged at 41 35
[mpeg2video @ 0x2b331f003fd0]00 motion_type at 5 2
[mpeg2video @ 0x2b331f003fd0]ac-tex damaged at 0 0

That hasn´t occured earlier in the log it records two channels for ~30 minutes before disconnecting, I strongly suspect that
recording on both 
tuners paired with bad reception? has triggered the disconnects.

So what´s more needed in the logs?

/Henrik



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