[vdr] missing piece at end of cutted recording

Joerg Riechardt J.Riechardt at gmx.de
Sat Apr 29 13:26:24 CEST 2006

Klaus Schmidinger schrieb:
> Joerg Riechardt wrote:
>> * I record a film
>> * I set 2 marks (time a and time b) and cut
>> * in the cutted film there are 2 marks as well (time c and time d)
>> * I compare the length of the piece between the 2 marks in the 
>> original with the cutted film: d-c is shorter than b-a, the differenc 
>> is b-(last i-frame before b)
>> * if the cutted film is very short, like 10 seconds, you see that 
>> after d there is a little more film, but not enough that you could 
>> shift mark d further to the end
>> this is with the last vdr versions and vdr-xine.
>> do others have the same effect? is this known? is there a fix?
> This is normal.
> Editing marks can only be set at I-frame positions.
> With marks at I-frames 'a' and 'b', everything from
> 'a' to the frame *before* 'b' (which is either a P- or
> a B-frame) will go into the edited version.
> At the time this was implemented in cCuttingThread::Action()
> it seemed like the simplest solution to stop right before
> the last mark, and for a normal (i.e. reasonably long)
> recording this shouldn't make much of a difference.
> But I agree that with shorter recordings this might
> be irritating.

For shorter recordings this is really irritating.
Thanks for explaining.

> I currently see no reason why the last I-frame couldn't
> be part of the edited version. However, there is
>   esyslog("ERROR: 'I' frame at end of file #%d", *FileNumber);
> in cIndexFile::GetNextIFrame(), so any change in that area
> would require more thought. So this will have to wait until after
> version 1.4.
> Klaus
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