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

Michael Niedermayer michaelni
Mon Jul 21 04:58:06 CEST 2008

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.

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Awnsering whenever a program halts or runs forever is
On a turing machine, in general impossible (turings halting problem).
On any real computer, always possible as a real computer has a finite number
of states N, and will either halt in less than N cycles or never halt.
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