[XviD-devel] About interlacing decoding & GMC issue

[daniel smith]

hi,

this is correct, xvid does not support decoding or encoding of field (dual 16x8) motion vectors.  the only interlacing functionality is decoding/encoding of the field-dct mode.

i have often hoped to add field vector support to xvid, perhaps in a couple months when i am not working as many hours.  the list of things which must be added/changed to support field vectors is quite large.

dan

----- Original Message -----
From: <CKHuang at via.com.tw>
Date: Tue, 1 Jul 2003 20:53:35 +0800
To: <xvid-devel at xvid.org>
Subject: [XviD-devel] About interlacing decoding & GMC issue

> Hi all,
>  
> I downloaded the xvid source code & added Xv display support in the example code - xvid_decraw.c so that I could see the decoded video on screen.
>  
> I got some cmp file (pure video bitstream which encoded by iso mpeg4 codec) to test. However, if the files have interlacing encoded or GMC encoded, warpping points =0, or 1, the video will decode error. If the warpping points = 2, or 3, the video decoded correctly through the Xv display.
>  
> According to the iso/iec mpeg-4 specification, 7.7.2.1 Motion vector decoding in P- and S(GMC)-VOP:
> there are 3 cases for the interlacing motion vector decoding.
> However, I trace the interlacing part of the source code, it seems no related codes to implement this.
>  
> Is it the reason that cause xvid decoded interlacing encoded file error ?
> So does the GMC encoded, warpping point = 0, or 1 file.
>  
>  
> Thanks for you guys' help,
> Kevin Huang

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