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-rw-r--r--doc/ffmpeg.texi7
1 files changed, 7 insertions, 0 deletions
diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi
index 3d3d78fd32..4d363270e3 100644
--- a/doc/ffmpeg.texi
+++ b/doc/ffmpeg.texi
@@ -820,6 +820,13 @@ Dump each input packet to stderr.
When dumping packets, also dump the payload.
@item -re (@emph{input})
Read input at native frame rate. Mainly used to simulate a grab device.
+By default @command{ffmpeg} attempts to read the input(s) as fast as possible.
+This option will slow down the reading of the input(s) to the native frame rate
+of the input(s). It is useful for real-time output (e.g. live streaming). If
+your input(s) is coming from some other live streaming source (through HTTP or
+UDP for example) the server might already be in real-time, thus the option will
+likely not be required. On the other hand, this is meaningful if your input(s)
+is a file you are trying to push in real-time.
@item -loop_input
Loop over the input stream. Currently it works only for image
streams. This option is used for automatic FFserver testing.