[x264-devel] [Tom Jacobs <T.R.Jacobs at lboro.ac.uk>] increasing slice for hd videos

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----- Forwarded message from Tom Jacobs <T.R.Jacobs at lboro.ac.uk> -----

From: Tom Jacobs <T.R.Jacobs at lboro.ac.uk>
Date: Mon, 12 Sep 2005 17:46:23 +0100
Subject: increasing slice for hd videos
User-Agent: Internet Messaging Program (IMP) 3.2.5

hi

i have been looking at the bitrate degredation coursed by increasing the
number of slices per frame. for small resolutions like qcif the increase in
bitrate can be up to 30% (see attached eps's), for hd resolutions thoughthe
increase is about 10x less. with this small increase observed by 4 slices
for a hd video i was going to investigate the bitrate penalties for a
higher number of slices, say 32.

i have looked through the code and as far as i can see there isnt a limit to
the number of slices i can set. i think i am probably blind since i think it
is locked down to max 4 but i can quite see where.

if someone can point me in the direction of the limit so i can alter it and
test the bitrate that would be handy

thanks

Tom


ps  this is what the eps show

rush_hour-192-1088-br.eps  :   relative bitrate for 1-4 slices on a hd video
br-slice.eps   :   relative bitrate of the same video at three different
resolutions, all with 4 slices. each are relative to its own 1slice bitrate


----- End forwarded message -----

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