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

[Diego Biurrun]

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
> >>
> >> --- doc/ffmpeg-doc.texi       (revision 14318)
> >> +++ doc/ffmpeg-doc.texi       (working copy)
> >> @@ -385,7 +385,10 @@
> >>  @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."

Commit it.

Diego