[FFmpeg-devel] [PATCH] doc/ffmpeg: fix/extend documentation for -copyts

Stefano Sabatini stefasab at gmail.com
Thu Nov 22 00:22:04 CET 2012

 doc/ffmpeg.texi |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi
index 9f87318..a27f8fd 100644
--- a/doc/ffmpeg.texi
+++ b/doc/ffmpeg.texi
@@ -867,8 +867,16 @@ the parameter is the maximum samples per second by which the audio is changed.
 -async 1 is a special case where only the start of the audio stream is corrected
 without any later correction.
 This option has been deprecated. Use the @code{asyncts} audio filter instead.
 @item -copyts
-Copy timestamps from input to output.
+Do not process input timestamps, but keep their values without trying
+to sanitize them. In particular, do not remove the initial start time
+offset value.
+Note that, depending on the @option{vsync} option or on specific muxer
+processing, the output timestamps may mismatch with the input
+timestamps even when this option is selected.
 @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:

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