[FFmpeg-cvslog] doc/ffmpeg.texi: document the new -start_at_zero option

[Rodger Combs]

ffmpeg | branch: master | Rodger Combs <rodger.combs at gmail.com> | Tue Oct 21 01:23:55 2014 -0500| [1372c557866ad4f1406a42033ab859fae6f909a0] | committer: Michael Niedermayer

doc/ffmpeg.texi: document the new -start_at_zero option

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=1372c557866ad4f1406a42033ab859fae6f909a0
---

 doc/ffmpeg.texi |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi
index 4fc7682..38dca86 100644
--- a/doc/ffmpeg.texi
+++ b/doc/ffmpeg.texi
@@ -1016,6 +1016,12 @@ processing (e.g. in case the format option @option{avoid_negative_ts}
 is enabled) the output timestamps may mismatch with the input
 timestamps even when this option is selected.
 
+ at item -start_at_zero
+When used with @option{copyts}, shift input timestamps so they start at zero.
+
+This means that using e.g. @code{-ss 50} will make output timestamps start at
+50 seconds, regardless of what timestamp the input file started at.
+
 @item -copytb @var{mode}
 Specify how to set the encoder timebase when stream copying.  @var{mode} is an
 integer numeric value, and can assume one of the following values: