From 091ce6bcb21e860cfe726e83f16e99e280c90e1a Mon Sep 17 00:00:00 2001
From: Lou Logan <lou@lrcd.com>
Date: Mon, 25 Jun 2012 14:37:01 -0800
Subject: [PATCH] doc/faq: add -start_number example
Also add example showing cat piping images to ffmpeg.
Signed-off-by: Stefano Sabatini <stefasab@gmail.com>
---
doc/faq.texi | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/doc/faq.texi b/doc/faq.texi
index 4d1d071bec0..da49d318d7a 100644
--- a/doc/faq.texi
+++ b/doc/faq.texi
@@ -110,7 +110,16 @@ Then you may run:
Notice that @samp{%d} is replaced by the image number.
-@file{img%03d.jpg} means the sequence @file{img001.jpg}, @file{img002.jpg}, etc...
+@file{img%03d.jpg} means the sequence @file{img001.jpg}, @file{img002.jpg}, etc.
+
+Use the @option{-start_number} option to declare a starting number for
+the sequence. This is useful if your sequence does not start with
+@file{img001.jpg} but is still in a numerical order. The following
+example will start with @file{img100.jpg}:
+
+@example
+ ffmpeg -f image2 -start_number 100 -i img%d.jpg /tmp/a.mpg
+@end example
If you have large number of pictures to rename, you can use the
following command to ease the burden. The command, using the bourne
@@ -133,6 +142,12 @@ Then run:
The same logic is used for any image format that ffmpeg reads.
+You can also use @command{cat} to pipe images to ffmpeg:
+
+@example
+ cat *.jpg | ffmpeg -f image2pipe -c:v mjpeg -i - output.mpg
+@end example
+
@section How do I encode movie to single pictures?
Use:
--
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