[vdr] Re: vdr - some general questions

[Martin Werber <werber@mpiz-koeln.mpg.de>]

Klaus Schmidinger wrote:

> Tobias Meyer-Janson wrote:
> >
> > Klaus Schmidinger <Klaus.Schmidinger@cadsoft.de>  wrote:
> >
> > > > Tobias Meyer-Janson wrote:
> >
> > > > > - I noticed that playing  recordings stops about 1s befor the end. Is
> >
> > Nobody any idea to this?
> > Now I realized that the 1s are not constant. So for configuring a
> > cutting I do not know how much ofset I have to add at last to enable
> > watching the cutted recording upto the end.
>
> I'm not sure whether the driver plays all the data sent if the data stream
> ends at some point. This might be the same problem as with the still pictures.
> Maybe we need to repeat the last frame several times until the buffers are
> flushed.
>
> > > > > - Is there a rule, when deleted files will be removed?
> >
> > > Actually they are removed when there is no other activity (like recording
> > > or user activity).
> >
> > Hmm, I expected this but in my case it seems that vdr waits until the
> > space is needed. I think I have to watch at this, perhaps in the past
> > when I tested it there was not enough idle.
>
> Take a look into recording.c, function RemoveDeletedRecordings() to see how and when
> VDR actually removes files. One condition is that the recording needs to be older
> than 1 hour before it is deleted. These things are no "black magic", but just some
> thing I did to attempt that an actual file removal is done when the system is
> idle.
>
> > > This is to minimize the risk of interfering with a
> > > recordings disk activity.
> >
> > Good point.
> >
> > > If a recording is going on and the system is runnign out of free disk space,
> > > deleted files are removed even during recording to make room for the new
> > > recording.
> >
> > Should I expect problems concerning the disk speed if there are 1 or 2
> > recordings and one removing operation?
> > (Or 1-2 recordings & 1 cutting so that than the source can be deleted
> > and removed.)
>
> That depends mainly on the performance of your disk. Removing a file while
> recording may or may not interfere with the recording. I'm afraid that's
> all I can say.
>
> Klaus
> --
> _______________________________________________________________
>
> Klaus Schmidinger                       Phone: +49-8635-6989-10
> CadSoft Computer GmbH                   Fax:   +49-8635-6989-40
> Hofmark 2                               Email:   kls@cadsoft.de
> D-84568 Pleiskirchen, Germany           URL:     www.cadsoft.de
> _______________________________________________________________

To disk performance i would say activate DMA with hdparm -d1 /dev/hd***  and i think
that VFAT has quite lower performance than a native linux fs but did not measure ...
Greetings Martin