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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
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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. 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 If you have large number of pictures to rename, you can use the
following command to ease the burden. The command, using the bourne 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. 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? @section How do I encode movie to single pictures?
Use: Use: