[linux-dvb] Antwort: Re: High system load when replaying a recording with AC3 and help setting up a fifo

[Stefan.Hagendorn@lindy.cc]

Hi Dieter ...

Yes the problem still exist I can't ompile ac3play. "ac3dec -C" does the
same as ac3play .. it just puts the data and throws is to the spdif
interface ..

About the systemload .. I just looked at top while replaying without ac3
data and vdr takes about 10-20% load. But when I play a recording with ac3
data cdr goes up to 90-99% systemload .. While replaying I get many errors
in the systemlog from the alsa interface .. I belive it is cause the high
system load.
Dieter, didn't you wrote a script which checks a fifo and if data exist
start ac3play ??? this would be something I like to try cause my other
issue I've wrote about.


Greetings
Stefan

Alsa Log errors
Jun 26 20:05:44 unimatrix kernel: ALSA pcm_lib.c:111: Unexpected hw_pointer
value (delta: -60): wrong interrupt acknowledge?
Jun 26 20:05:45 unimatrix last message repeated 3 times
Jun 26 20:05:45 unimatrix kernel: ALSA pcm_lib.c:111: Unexpected hw_pointer
value (delta: -124): wrong interrupt acknowledge?
Jun 26 20:05:45 unimatrix kernel: ALSA pcm_lib.c:111: Unexpected hw_pointer
value (delta: -124): wrong interrupt acknowledge?
Jun 26 20:06:03 unimatrix kernel: ALSA pcm_lib.c:111: Unexpected hw_pointer
value (delta: -28): wrong interrupt acknowledge?
Jun 26 20:06:03 unimatrix kernel: ALSA pcm_lib.c:111: Unexpected hw_pointer
value (delta: -28): wrong interrupt acknowledge?
Jun 26 20:06:06 unimatrix kernel: ALSA pcm_lib.c:111: Unexpected hw_pointer
value (delta: -60): wrong interrupt acknowledge?
Jun 26 20:06:06 unimatrix last message repeated 2 times


                                                                                                                   
                    Dieter Bloms                                                                                   
                    <dbloms@suse.        An:     Stefan.Hagendorn@lindy.cc                                         
                    de>                  Kopie:  linux-dvb@linuxtv.org                                             
                                         Thema:  Re: [linux-dvb] High system load when replaying a recording with  
                    01.07.2001           AC3 and help setting up a fifo                                            
                    20:23                                                                                          
                                                                                                                   
                                                                                                                   




Hi Stefan,

On Sun, Jul 01, Stefan.Hagendorn@lindy.cc wrote:

> Does anyome detect a very high systemload when playing an AC3 recording
???

My DVB- System is realized with a 166MHz Pentium und AC3 works fine for
me.

> Is this due to the pipe which wrotes into a programm .. is there a way to
> reduce it like pipe into a fifo and let the decoding program read from
> there ??

You can make a pipe device (mknod -p). But I think this will not help.

> Btw .. can anyone show me how to setup a FIFO .. let VDR pipe the ac3data
> into the fifo and read with a decoder programm from this fifo, but only
if
> it is not NOTHING .. The Problem on my site is: When ac3dec is started it
> mutes my digital input because it switchs the soundcard to raw data. I
have
> connected the dvb-s to the digital input. This way I can hear the
tv-sound
> an mix other pcm over the soundcard (like playing mp3). VDR now opens the
> pipe to ac3dec everytime a recording is replayed, even if it does not
> contain ac3 data but the dvb-s is muted for me :-(

BTW.: If you have a digital amplifier, why do you use ac3dec ?
ac3play puts the ac3 stream direct to the digital output and the
amplifier decodes the data, or does the problem with compiling still exist
?


--
Mit freundlichen Gruessen,

           Dieter Bloms (Dieter.Bloms@suse.de)

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