lavc: do not init frame with guessed layout.

[ffmpeg] / doc / ffmpeg-formats.texi

diff --git a/doc/ffmpeg-formats.texi b/doc/ffmpeg-formats.texi
index 30cf415d14f9a46ce34f807875d6889794fe73d2..1dce6e7584b53f4d51cb138949e0b55875ab0d0c 100644 (file)
--- a/doc/ffmpeg-formats.texi
+++ b/doc/ffmpeg-formats.texi
@@ -140,8 +140,22 @@ Consider things that a sane encoder should not do as an error.
 Use wallclock as timestamps.
 
 @item avoid_negative_ts @var{integer} (@emph{output})
-Shift timestamps to make them positive. 1 enables, 0 disables, default
-of -1 enables when required by target format.
+Shift timestamps to make them positive. A value of 1 enables shifting,
+a value of 0 disables it, the default value of -1 enables shifting
+when required by the target format.
+
+When shifting is enabled, all output timestamps are shifted by the
+same amount. Audio, video, and subtitles desynching and relative
+timestamp differences are preserved compared to how they would have
+been without shifting.
+
+Also note that this affects only leading negative timestamps, and not
+non-monotonic negative timestamps.
+
+@item flush_packets @var{integer} (@emph{output})
+Flush the underlying I/O stream after each packet. Default 1 enables it, and
+has the effect of reducing the latency; 0 disables it and may slightly
+increase performance in some cases.
 @end table
 
 @c man end FORMAT OPTIONS