[XviD-devel] A problem on decoding vol_ver_id

[Xiang Li]

Hi Skal and all,

I think you may encounter such problem with MPEG4 ASP Level 5. I am sorry
that I can not post our bitstream here. But at least, we agree on that it is
a bug. Do you know whether it can be fixed in the next release version of
xvid?

Thanks and regards,

Xiang Li


On 3/21/06, skal <skal at planet-d.net> wrote:
>
>
> Hi Xiang Li and all,
>
> On Tue, 2006-03-14 at 14:19 +0100, Xiang Li wrote:
> > Hi everybody,
> >
> > I found a problem in xvid 1.1.0. Please have a look at the following
> code
> > (src\bitstream\bitstream.c)
> [...]
> > Please note the red line. According to the standard 6.3.3 Video Object
> > Layer, If both visual_object_verid and video_object_layer_verid exist,
> > the semantics of video_object_layer_verid supersedes the other. When
> this
> > field does not exist, the value of video_object_layer_verid is
> substituted
> > by the value of visual_object_verid. So I think vol_ver_id should not be
> set
> > to 1 here. Is it a bug?
>
>        Yep, i think it is. We should keep track of the global
>        visual_object_verid value, and use it as a default
>        value (instead of '1') when video_object_layer_verid
>        isn't present.
>
>        Now, i haven't met this (rare) situation in any bitstream
>        yet. Would you have such a sample available, by chance?
>
>        bye!
> Skal
>
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