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doc/faq: add -start_number example

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Also add example showing cat piping images to ffmpeg.

Signed-off-by: Stefano Sabatini <stefasab@gmail.com>
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Lou Logan 2012-06-25 14:37:01 -08:00 committed by Stefano Sabatini
parent 69d75dc4dd
commit 091ce6bcb2
1 changed files with 16 additions and 1 deletions
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doc/faq.texi
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@ -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: