[gmx-users] Specified frame doesn't exist or file not seekable

[Mark Abraham]

sudheer babu wrote:
> Hi all,
>        I am having 7.25ns trajectory file , I am trying to pick up  
> 6250ps to 7250 ps  trajectory file from whole trajectory by using trjconv,
> Command line is
>     *trjconv  -f  7.25ns.xtc  -s  pr.tpr  -o 6.25_7.25_out.trr  -b  
> 6250  -e  7250
>      selected  " system " for getting output
>  it showed the following error
> -----------------------------------------------------------------
> Program trjconv, VERSION 3.3.1
> Source code file: trxio.c, line: 635
> 
> Fatal error:
> Specified frame doesn't exist or file not seekable
> -----------------------------------------------------------------------

That sounds pretty specific to me. What's your evidence that the file is 
seekable and these frames exist?

Check that your .mdp file options should have caused XTC output to be 
written in this time. Then look at a gmxdump of this .trr file.

It's not relevant to the problem, but there's almost no value in writing 
XTC input in .trr format on output.

>  I have found few discussions in gmx-archives regarding this problem and 
> due to BUG in source code its showing error.

That's great, but some person donating their time is not going to bother 
re-doing this search to find what you're referring to. If you want 
people to give you feedback on the applicability of these bug 
discussions to your problem, you should provide them with a link. If 
you've searched the archives from the GROMACS webpage, be sure to 
provide a link to the correct HTML frame (e.g. by right-clicking on it 
and choosing from the menu), and check that the resulting URL does what 
you expect.

Mark