[MEncoder-users] Minimize posterization in areas of low contrast when downscaling HD h.264 to mpeg2video

[L Lee]

On 8/10/09 10:46 PM, "The Wanderer" <wanderer at fastmail.fm> wrote:

> On 08/10/2009 08:17 PM, James Hastings-Trew wrote:
> 

>> Generally speaking != means "not equal".  So the warning is saying
>> "vrc_minrate and vrc_maxrate should equal each other", which sounds a
>> bit whacky. Perhaps someone can explain.
> 
> No - it's saying "if vrc_minrate is not zero, then it's not recommended
> for vrc_maxrate to not be equal to vrc_minrate". IOW, the only time when
> nonzero vrc_minrate is recommended is when doing CBR video, which isn't
> very common AFAIR.
> 
> Exactly why this isn't recommended, or whether the recommendation is
> even correct any longer, I don't know.

If I use the following options and values, I don't get a warning, but the
bitrate goes well above 7200. Any idea why? Thanks.

vcodec=mpeg2video:vrc_buf_size=1835:vbitrate=7200:
vrc_maxrate=7200:vrc_maxrate=7200

Laine Lee