[FFmpeg-devel] [PATCH] Issue 543, clarification of -bt in docs

[Michael Niedermayer]

On Sun, Jul 20, 2008 at 09:41:45PM -0600, Jason Garrett-Glaser wrote:
> On Sun, Jul 20, 2008 at 8:58 PM, Michael Niedermayer <michaelni at gmx.at> wrote:
> > On Sun, Jul 20, 2008 at 06:18:46PM -0700, tripp wrote:
> >> patch attached
> >>
> >>
> >> tripp
> >>
> >>
> >>
> >> Index: doc/ffmpeg-doc.texi
> >> ===================================================================
> >> --- doc/ffmpeg-doc.texi       (revision 14318)
> >> +++ doc/ffmpeg-doc.texi       (working copy)
> >> @@ -385,7 +385,10 @@
> >>  @item -vn
> >>  Disable video recording.
> >>  @item -bt @var{tolerance}
> >> -Set video bitrate tolerance (in bit/s).
> >> +Set video bitrate tolerance (in bits, default 4000k).
> >> +Has a minimum value of: (target_bitrate/target_framerate).
> >
> >> +For 1 pass BT specifies how hard the RC code should try to achieve CBR.
> >
> > I do not like the way this is said, because its not true and will misslead
> > users into thinking low bt would achive CBR.
> 
> Better description, if a bit long:
> 
> "In 1-pass mode, bitrate tolerance specifies how far ratecontrol is
> willing to deviate from the target average bitrate value.  This has
> nothing to do with minimum and maximum bitrate, but rather how close
> ratecontrol gets to the target bitrate.  Lower tolerance results in
> worse quality."

great, commit!

btw, one thing i wanted to ask you since a while already ...
Are you interrested in merging the x264 & lavc ratecontrol code?
The reason why iam asking is that IMHO the current state of it being
"forked" in x264 and being improved there isnt ideal. And that will
become just worse over time as people improve both independantly ...


[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

When you are offended at any man's fault, turn to yourself and study your
own failings. Then you will forget your anger. -- Epictetus
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