[AG-TECH] Compiling VIC from source to enable High-res streams

Robert Olson olson at mcs.anl.gov
Thu Feb 20 10:45:20 CST 2003

Wrt the h261 problem you might be running into a compiler optimizer bug; we 
ran into this with gcc 2.96 last summer - vic would work fine compiled on a 
6.2 machine with its native compiler (egcs something or other), but on a 
7.2/7.3 machine with 2.96 (and 3.0 I think as well) the h261 encoder was 


At 03:34 PM 2/20/2003 +0000, S.Booth wrote:

>I have been trying to modify the ag-vic source from
>   :pserver:anonymous at fl-cvs.mcs.anl.gov:/cvsroot/ag-vic
>to enable higher res video streams using the h263+ codec.
>(My current version of a patch to do this is attached)
>In the original code there were various statically sized buffers that were
>only large enough for normal image sizes.
>  It seems to work up to a point (for some reason the thumbnails don't work
>when sending a large image size stream but this seems to be a
>generic problem as the same happens with the bvc codec as well.
>However the main problem is that vic runs VERY VERY slowly compared with
>the normal ag vic (vic-2001-0601) and the h.261 codec seems broken!
>Are there some debug flags I should be turning off or is this a problem
>with the compiler version I'm using?
>I'm using
>         gcc version 2.96 20000731 (Red Hat Linux 7.3 2.96-110)
>                 Stephen
>|epcc| Dr Stephen P Booth             Project Manager           |epcc|
>|epcc| s.booth at epcc.ed.ac.uk          Phone 0131 650 5746       |epcc|

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