[vdr] Re: Problem during recording and watching the same channel

[Gerald Raaf <graaf@attglobal.net>]

Hi,

Davide Krähenbühl schrieb:

> On Mercoledì, ago 27, 2003, at 09:21 Europe/Zurich, Klaus Schmidinger
> wrote:
>
> > Davide Krähenbühl wrote:
> >>
> >> On Mercoledì, ago 27, 2003, at 08:40 Europe/Zurich, Klaus Schmidinger
> >> wrote:
> >>
> >>> Davide Krähenbühl wrote:
> >>>>
> >>>> hi all,
> >>>>
> >>>> this is my first post in this mailing list.
> >>>>
> >>>> I use vdr 1.2.4 without any patch or plugin, my dvb-s card is a
> >>>> nexus
> >>>> 2.1 with linux-dvb driver 1.0. when I record something I have that
> >>>> kind
> >>>> of error:
> >>>>
> >>>> Aug 27 00:14:58 mediabox vdr[1293]: transfer thread started
> >>>> (pid=1293)
> >>>> Aug 27 00:14:58 mediabox vdr[1294]: receiver thread started on
> >>>> device
> >>>> 1
> >>>> (pid=1294)
> >>>> Aug 27 00:15:02 mediabox vdr[1320]: recording thread started
> >>>> (pid=1320)
> >>>> Aug 27 00:15:02 mediabox vdr[1293]: ERROR (transfer.c,108):
> >>>> Operation
> >>>> not permitted
> >>>> Aug 27 00:15:13 mediabox vdr[1294]: buffer usage: 80% (pid=1293)
> >>>> Aug 27 00:15:14 mediabox vdr[1294]: buffer usage: 85% (pid=1293)
> >>>> Aug 27 00:15:14 mediabox vdr[1294]: buffer usage: 90% (pid=1293)
> >>>> Aug 27 00:15:14 mediabox vdr[1294]: buffer usage: 95% (pid=1293)
> >>>> Aug 27 00:15:15 mediabox vdr[1294]: buffer usage: 100% (pid=1293)
> >>>> Aug 27 00:15:15 mediabox vdr[1294]: ERROR: ring buffer overflow (89
> >>>> bytes dropped)
> >>>> Aug 27 00:15:22 mediabox vdr[1293]: ERROR: PES packet length
> >>>> overflow
> >>>> in remuxer (stream corruption)
> >>>>
> >>>> what I see and hear on my TV is very crappy but the recorded file is
> >>>> good. this append only when I watch the same channel I record.
> >>>> I have the same problem with old version of vdr like 1.2.1 and
> >>>> 1.2.2.
> >>>
> >>> Are you sure you have DMA activated for your harddisk?
> >>>
> >>> Klaus
> >>
> >> yes, of course, here the hdparm:
> >>
> >> /dev/hda:
> >>   multcount    = 16 (on)
> >>   IO_support   =  1 (32-bit)
> >>   unmaskirq    =  1 (on)
> >>   using_dma    =  1 (on)
> >>   keepsettings =  0 (off)
> >>   readonly     =  0 (off)
> >>   readahead    =  8 (on)
> >>   geometry     = 3333/255/63, sectors = 53550304, start = 0
> >>
> >> and I forgot to say that if I stop to record the video and audio
> >> problem continue until I switch channel. If I watch a channel and
> >> record another one there is no problem, all works perfectly.
> >
> > Then you may want to try activating the lines
> >
> >         /*
> >         if (!gotBufferReserve) {
> >            if (ringBuffer->Available() < 4 * MAXFRAMESIZE) {
> >               usleep(100000); // allow the buffer to collect some
> > reserve
> >               continue;
> >               }
> >            else
> >               gotBufferReserve = true;
> >            }
> >            */
> >
> > in VDR/transfer.c (simply by removing the comment characters).
>
> I just try to remove the comment characters, recompile vdr, record
> something and watching the same channel. here the log file with the
> errors I have:
>
> Aug 27 11:25:13 mediabox vdr[1133]: transfer thread started (pid=1133)
> Aug 27 11:25:13 mediabox vdr[1134]: receiver thread started on device 1
> (pid=1134)
> Aug 27 11:25:13 mediabox vdr[871]: timer 2 (1 1125-1425 '@TITLE
> EPISODE') start
> Aug 27 11:25:13 mediabox vdr[871]: Title: 'Appuntamento al cinema'
> Subtitle: ''
> Aug 27 11:25:13 mediabox vdr[871]: record
> /video/@Appuntamento_al_cinema__/2003-08-27.11:25.50.50.rec
> Aug 27 11:25:13 mediabox vdr[871]: creating directory
> /video/@Appuntamento_al_cinema__
> Aug 27 11:25:13 mediabox vdr[871]: creating directory
> /video/@Appuntamento_al_cinema__/2003-08-27.11:25.50.50.rec
> Aug 27 11:25:13 mediabox vdr[871]: recording to
> '/video/@Appuntamento_al_cinema__/2003-08-27.11:25.50.50.rec/001.vdr'
> Aug 27 11:25:13 mediabox vdr[1136]: recording thread started (pid=1136)
> Aug 27 11:25:15 mediabox vdr[1134]: buffer usage: 80% (pid=1133)
> Aug 27 11:25:15 mediabox vdr[1134]: buffer usage: 85% (pid=1133)
> Aug 27 11:25:15 mediabox vdr[1134]: buffer usage: 90% (pid=1133)
> Aug 27 11:25:15 mediabox vdr[1134]: buffer usage: 95% (pid=1133)
> Aug 27 11:25:15 mediabox vdr[1134]: buffer usage: 100% (pid=1133)
> Aug 27 11:25:15 mediabox vdr[1134]: ERROR: ring buffer overflow (89
> bytes dropped)
> Aug 27 11:25:15 mediabox vdr[1134]: ERROR: ring buffer overflow (188
> bytes dropped)
> Aug 27 11:25:24 mediabox last message repeated 17794 times
>
> if I use the menu (moving around the menu during the recording) the
> video and audio problem become more visible.
>
> --
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Thats a buffering problem, i don't know exactly where the problem is, perhaps the
machine is to fast or buggy filesystem (locking) or something else.
In addition to the changes Klaus posted, you can increase the buffer size in transfer.c
from 1 Megabyte lets say to 5 or 10 its in Line 15
#define VIDEOBUFSIZE MEGABYTE(1)
and change it to
#define VIDEOBUFSIZE MEGABYTE(10)

that will solve the problem, for me and perhaps for you also :-)

Gerald



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