I don't think there is a calculator that is available for
calculating the right bitrate to use for a WM9 2 pass
encode session. There is one for xvid, RV9, and divx5. Do
anyone here know a formula to determining the right
bitrate? I made a post in the doom9 forum and a microsoft
employee name MingCl mention the following:
"The way to calculate the bitrate for 2-pass VBR is
pretty much the same as CBR (except the factor of buffer
size in CBR).
However, one key factor, which we didn't seem to document
in the help of the VCM beta release (and I will make sure
that we add this in RTM), is that there is no frame
dropping allowed in the VBR mode on the encode side. That
is, if the specified bitrate is too low and the ecoder
can't meet this target even when using the lowest
quality, it will exceed the bitrate. This is documented
in WMEncoder 9, but not WMV 9 VCM beta.
But I am not sure whether this is the cause of Crabba's
issue since it is strange that the bitrate is decreased
when the key frame distance is reduced. It should be the
other way. So I do need to get Crabba's settings and
possibly source as well to repro the problem here."
I'm hoping that one of you at least have a clue in what
he's saying and clearify this for me. Thx
Quote:>-----Original Message-----
>Today we released the final version of the Windows Media
Video 9 VCM codec,
>designed to meet 2 important needs:
>1. Legacy encoding and editing applications can now
support the WMV9 codec
Quote:>in file containers such as AVI.
>2. WMV 9 content can now reach desktops running Windows
Media Player 6.4
>For customers using the 6.4 player, the WMV9 VCM decoder
will be
>automatically downloaded the first time the player
attempts to play content
Quote:>that has been encoded in WMV9. For installation on a PC
where internet
>access or administrator privileges are not available, we
have released a
>standalone installer package that can be scripted to
install using any
>software distribution software.
>The standalone package containing the codec, EULA and
documentation
>outlining how to incorporate the VCM codec into
applications is available
Quote:>for download at
>http://www.microsoft.com/windows/windowsmedia/9series/cod
ecs/vcm.aspx
>.