[vdr] Re: running out of space during cutting

[Klaus Schmidinger <Klaus.Schmidinger@cadsoft.de>]

Manfred Schmidt-Voigt wrote:
> 
> ...
> I have played a little bit with the AssertFreeDiskSpace Function and I
> think I know now the "weakness" of this function. It is optimized for
> a job during recordings. If you use this routine also for cutting than
> you should set some of the defines to other values. If you set
> MINDISKSPACE to 1024Mb than this is not enough for a "fast recording"
> as cutting is. You "record" more than 1GByte in 100 seconds
> (DISKCHECKDELTA) which is the second important value to this
> algorithm. So if you have a little bit more than 1GB free diskspace in
> the beginning but your recording need more than this you will only
> check in the beginning and than the "recording" runs out of space. I
> have set now MINDISKSPACE to 4096Mb and this should be sufficient to
> cut more than a 2hour movie. The other possibility is to lower
> DISKCHECKDELTA. But this will increase the process load.
> 
> Maybe you can think about something to determine if this function is
> called by a real recording or by the cutter and set the values than
> dynamically but with the big and cheap disks today its maybe more easy
> to spend these aditional 3GByte as free buffer on the video disk.

Increasing MINDISKSPACE would mean that a normal recording would also
delete more existing recordings than necessary if it has a higher
priority, so I'd like to keep that value as it is.

How about setting DISKCHECKDELTA to 10 and REMOVELATENCY to 1 in AssertFreeDiskSpace()?
This could be done dynamically by using the special value of -1 for the
Priority parameter, and simply dividing DISKCHECKDELTA and REMOVELATENCY,
respectively, by 10. That way deleted recording would be removed faster.

Please try

#define DISKCHECKDELTA    10 // seconds between checks for free disk space
#define REMOVELATENCY      1 // seconds to wait until next check after removing a file

to see whether this will do. If so, I'll add that change.

Klaus


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