[linux-dvb] Re: Green flicker when capturing via v4l interface

[Michael Hunold <hunold@convergence.de>]

Hello Stefan,

> The best ways to have such streams are mp1e and ffmpeg. Now I discovered 
> strange green flickers in the picture which comes up in irregluar 
> intervals but afaik allways with the same length. It happends with mp1e as 
> well as with ffmpeg. I recently updated from kernel 2.4.18 to 2.4.20 
> without success. ATM I run the DVB driver from 13.04.2003. The same 
> happend with the -pre2 Driver.
> To better understand what I mean, I've captured some seconds and extracted 
> the single frames here : http://www.lindy.cc/hagie/capture/index.htm
> Anyone got any tips how to solve this ???
You get the same effect when you capture with a yuv 422 pixelformat and 
swap the u and v values, so it seems that there a temporary glitches in 
the capture process. But I have no idea what the cause could be. 8-(

Do you have a mainboard with a VIA chipset?

"mp1e" can capture from v4l2 sources and the "nvrec" suite can record 
from v4l2 sources, too. It can use the "rte" from "mp1e" as a capture 
backend.

So if you think that this is a driver issue, I would ask you to try the 
dvb-kernel driver (which has a new saa7146 capture core) and use pure 
v4l2. You don't need to install the driver permanently, so you don't 
have to fear that you screw up your installation.

> Thanx in advance
> Stefan
CU
Michael.



--
Info:
To unsubscribe send a mail to listar@linuxtv.org with "unsubscribe linux-dvb" as subject.