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

[Davide Krähenbühl <davide@heark.com>]

> > > > > > 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.
> 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
hi,

whit the 2 modification (megabyte and comments) I made I have few ERROR 
messages into the log file:

Aug 27 14:12:19 mediabox vdr[1348]: ERROR: PES packet length overflow 
in remuxer (stream corruption)
Aug 27 14:12:19 mediabox vdr[1345]: ERROR: PES packet length overflow 
in remuxer (stream corruption)

but there is an out of sync between the audio and video, and the video 
isn't so fluid.

I use SUSE 8.2 with a Celeron 1.7Ghz Socket 478 and 256DDR Ram



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