[XviD-devel] vbv patch

[suxen_drol]

hey michael,

radek suggested removing "strict conformance" checkbox. however" and
always force these extra constraints. does anyone have any further
thoughts on the matter? i argue that having the checkbox allows some
experimentation with the divx profiles. again, i dont use these profiles,
so my position on this is mostly irrelevant.

-- pete

On Wed, 16 Feb 2005 18:47:35 +0100 Michael Militzer <michael at xvid.org>
wrote:
> Hi,
> 
> since vbv compliance and the DivX profile are an important new feature in
> XviD 1.1, I think the patch should be applied and another beta should be 
> released. After all, the current implementation of the DXN profiles in 1.1
> beta1 is wrong, so your patch is imho more a bugfix than a new feature.
> 
> bye,
> Michael
> 
> 
> Quoting peter ross <suxen_drol at hotmail.com>:
> 
> > gday,
> > 
> > divxnetworks has advised the our current dxn profiles do not conform to 
> > their latest
> > certification standard, and should be modificied to incorporate the 
> > following constraints:
> > 
> > * 4mv is disabled for the handheld profile
> > * 1:1 picture aspect only
> > * disable bframes if interlacing is enabled
> > * force maximum of 1 consecutive bvop for the portable and ht profiles, and 
> > 2 bvops for the hd profile
> > * always write divx 5 userdata string to bitstream "DivX503b1393(p)"
> > * force packed bitstream option
> > * update vbv params
> > 
> > i have assembled a patch, that adds an additional "strict conformance to dxn
> > 
> > profile
> > standard" checkbox. this is checked by default, but can be unchecked by 
> > advanced
> > users who wish to experiment. since the v1.1 release is impending and 
> > feature
> > frozen, i have attached the patch below for review. perhaps we need another 
> > beta,
> > to give users a chance to test the "new" profiles with hardware players?
> > 
> > christoph: dxn now uses a "max bits over 1sec constraint" instead of the 
> > 3sec constraint.
> > this needs to be changed within xvidcore. currently, vfw multiplies the 
> > 1second
> > constraint by 3 before passing it to xvidcore.
> > 
> > FULL CHANGE LOG:
> > 
> > xvidcore
> > ========
> > added XVID_GLOBAL_DIVX5_USERDATA global flag
> > removed the bvop delay warning text. this confuses joe user.
> > 	"warning: nothing to output"
> > 	"bframe decoder lag"
> > minor changed to closed gop image_printf statement:
> > 	s/"DX50 BVOP->PVOP"/"CLOSED GOP BVOP->PVOP"
> > additional comments for low_delay_default mode within decoder_decode()
> > divx userdata string: s/DivX999b000/DivX503b1393
> >   this has been suggested by dxn for improved hardware compatibility
> >   [nb: i dont have a hardware player to confirm this]
> > vbv_peakrate constraint is ignored if <= 0
> > 
> > vfw frontend
> > ============
> > "strict conformance to DXN profile standard" checkbox:
> >   force 1:1 picture aspect ratio
> >   disable bframes if interlacing is enabled
> >   force maximum of 1 consecutive bvops for the portable and ht profiles, 2 
> > bvops for the hd profile
> >   always write divx 5 userdata string to bitstream
> >   force packed bitstream option
> >   updated dxn vbv parameters
> > 
> > added PROFILE_4MV flag. 4mv is now disabled for the dxn handheld profile.
> > moved PROFILE_AS/PROFILE_ARTS/PROFILE_S to config.c
> > profile[].max_bitrate now measured in bit/sec (not kbps)
> > 
> > profile->level box: widgets are now greyed-out if they are not used.
> > increase vertical size of profile drop down list.
> > 
> > about box button: s/Dismiss/OK
> > 
> > cheers,
> > -- pete
> > 
> > 
> 
> 
> 
> 
> _______________________________________________
> XviD-devel mailing list
> XviD-devel at xvid.org
> http://list.xvid.org/mailman/listinfo/xvid-devel


-- pete