From 091ce6bcb21e860cfe726e83f16e99e280c90e1a Mon Sep 17 00:00:00 2001 From: Lou Logan 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 --- 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: -- 2.39.5