From e3576e25132471f46e38d0dfb9092c7b1b334947 Mon Sep 17 00:00:00 2001 From: Jason Garrett-Glaser Date: Fri, 25 Jul 2008 21:04:06 +0000 Subject: [PATCH] Improve documentation about -bt option Originally committed as revision 14397 to svn://svn.ffmpeg.org/ffmpeg/trunk --- doc/ffmpeg-doc.texi | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/doc/ffmpeg-doc.texi b/doc/ffmpeg-doc.texi index ec5e784176..b87fd3ac0c 100644 --- a/doc/ffmpeg-doc.texi +++ b/doc/ffmpeg-doc.texi @@ -385,7 +385,12 @@ blue (default = 000000 (black)). @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). +In 1-pass mode, bitrate tolerance specifies how far ratecontrol is +willing to deviate from the target average bitrate value. This is +not related to min/max bitrate. Lowering tolerance too much has +an adverse effect on quality. @item -maxrate @var{bitrate} Set max video bitrate (in bit/s). Requires -bufsize to be set.