[x264-devel] [Bug report] range error of vertical motion vector in X264 stream

[Jason Garrett-Glaser]

2008/11/18 임 세윤 <onestar3636 at yahoo.co.kr>:
> Dear all,
>
> I write this e-mail to figure out whether this is bug or not.
>
> Recently I got a report from my customer with an x264 stream.
>
> (My company is H/W codec provider in South Korea)
>
>
> After checking the streams with Tektronix Analyzer,
>
> I found that there were some motion vector being out of normal range
>
>
> In H.264 level 5.1, As you know,  Vertical motion vectors does not exceed
> [-512, +511.75].
>
> In the result of the Analyzer, some vertical motion vector has -512.75 ,
> -525 etc...
>
> Are these value available in X264 ?
>
> In my guess, X264 also follows the ragne of H.264 and doesn't exceed.
>
>
> If you had received or heard about similar report, please let me know
>
> Whether this is normal in X264 or debug...
>
>
> ( I don't know the version of the encoder that my customer used to make the
> stream.)

Odds are they are using a very old version of x264, as these
restrictions were hardcoded well over a year ago.

Fortunately, we don't support such old versions.

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