[vdr] Re: Big Problem with playing DVD's

[wa_ho@t-online.de (Holger Wagner)]

Hello Andreas,

thank you for your answer.

"Andreas Schultz" <aschultz@cs.uni-magdeburg.de> schrieb:
> Hi Holger,
> 
> Sorry for not answering earlier,

No problem.

> 
> On Tuesday 23 April 2002 17:14, Holger Wagner wrote:
> > Hello,
> >
> > this is my second try with my DVD-problem.
> >
> > First time nobody resonse to my question. I hope, this time somebody can
> > help me with my DVD-Problem.
> >
> > I have four DVD's (Tremors 1; Tremors 2; Der Schuh des Manitu and Miss
> > Undercover)
> 
> i have tried the last two recently on my system and they did work normaly,  
> the problem has probably something do to with your setup.
> 
> > All four are the German Versions and with all four replay is not smooth.
> >
> > DVD frozen every few seconds for millisecond.
> > Audio and Video stucks every few seconds.
> > On a "normal" DVD-Player all four DVD's plays smooth.
> >
> > My Linux-VDR:
> > Duron 800Mhz, DVD 16x , Suse 7.2 , Kernel 2.4.4
> > 2x Hauppauge DVB-S 2.1 ,VDR 1.0.0 with AIO 17.04.02 and the DVB-Driver
> > Siemens_dvb-0.9.4-2002-04-01.tgz from Klaus Schmidinger's site.
> 
> Did you also try it with only one of the DVB cards pluged in? Also swap them 
> around to see wether there is a hardware problem. The kernel should be fine, 
> but to be sure would it be possible to upgrade to 2.4.18?
> 
I tried different configs (one Card, other DVD-port hdc, hdd and Raid on hde no change. i hope i don't need to change my kernel because all other soft is ok. Samba works, VDR works, my LCD works.

New thing i noticed at the moment. When DVD is playing, the Harddisk-LED is flashing syncron with the LED on DVD-ROM. I this right??

Following Message at Linux-Desktop is coming wenn starting DVD-Play:

-No accelerated IMDCT transform found

-Libdvdread: Using libdvdcss.so.2 for DVD access
( two times this message)

-demux: dvdreadblocks returned 0
( a lot of times this message!)

Nothing special in /var/log/messages


> > No problems with VDR record and replay only with DVD replay.
> >
> > DMA for the DVD-ROM-Drive is enabled.
> >
> > I have testet DVD-Speed with different hdparm -E Option's.
> >
> > hdparm -E1  Buffer-cache reads 193 MB/sec, disk reads 3,51 MB/sec /dev/dvd
> > hdparm -E4  Buffer-cache reads 193 MB/sec, disk reads 3,51 MB/sec /dev/dvd
> > hdparm -E16 Buffer-cache reads 193 MB/sec, disk reads 3,51 MB/sec /dev/dvd
> > hdparm -E48 Buffer-cache reads 193 MB/sec, disk reads 3,51 MB/sec /dev/dvd
> 
> that should be fine
> 
> > No change with different -E parameter.

Is it normal that disk reads don't change with differnet hdparm -E ?

> >
> > I have copyed the complete DVD on my harddisk and have link /dev/hda with
> > /dev/dvd . With replay DVD from my harddisk same problem, the replay stucks
> > every few seconds.
> 
> that proves that the dvd drive is not the problem
> 
> To check wether this a speed problem or not, you could this patch:
> 
> --- 1.3/ringbuffer.c    Mon Apr 22 12:34:03 2002
> +++ edited/ringbuffer.c Tue Apr 23 18:08:26 2002
> @@ -290,8 +290,10 @@
>    Lock();
>    cFrame *p = head ? head->next : NULL;
>    Unlock();
> -  if (!p && Wait)
> +  if (!p && Wait) {
> +     fprintf(stderr, "%10d: RingBufferFrame empty\n", time_ms());
>       WaitForGet();
> +  }
>    return p;
>  }
> 

I don't understand this. Sorry. 
I have to change the ringbuffer.c  -ok
New compile from VDR?
What is the result of this change?
(I am a Linux-Newbie)


Thank you for your suport.

Holger Wagner


> During menues and other intro sequences empty buffers are normal, but they 
> should not occure during the main feature after the initial first few 
> seconds.
> 
> Andreas
> 
> 
>