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doc: image2: update docs for glob input patterns

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* adapt examples to new syntax
* mention that glob chars need to be enabled by a preceding % char
* note that globbing will be performed if both a printf and globbing
  pattern would be possible judging from the input pattern

Signed-off-by: Alexander Strasser <eclipse7@gmx.net>
This commit is contained in:
Alexander Strasser 2012-04-06 00:21:43 +02:00
parent 735fb8ce59
commit f363773042
1 changed files with 13 additions and 5 deletions
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18
doc/ffmpeg.texi
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@ -1077,11 +1077,19 @@ ffmpeg -f image2 -i foo-%03d.jpeg -r 12 -s WxH foo.avi
The syntax @code{foo-%03d.jpeg} specifies to use a decimal number
composed of three digits padded with zeroes to express the sequence
number. It is the same syntax supported by the C printf function, but
only formats accepting a normal integer are suitable. When importing
an image sequence, -i also accepts shell-like wildcard patterns such as
@code{foo-*.jpeg}, @code{foo-???.jpeg} or @code{foo-00[234]*.jpeg}.
It will probably be necessary to escape these patterns so they do not
get interpreted by your shell.
only formats accepting a normal integer are suitable.
When importing an image sequence, -i also supports expanding shell-like
wildcard patterns (globbing) internally. To lower the chance of interfering
with your actual file names and the shell's glob expansion, you are required
to activate glob meta characters by prefixing them with a single @code{%}
character, like in @code{foo-%*.jpeg}, @code{foo-%?%?%?.jpeg} or
@code{foo-00%[234%]%*.jpeg}.
If your filename actually contains a character sequence of a @code{%} character
followed by a glob character, you must double the @code{%} character to escape
it. Imagine your files begin with @code{%?-foo-}, then you could use a glob
pattern like @code{%%?-foo-%*.jpeg}. For input patterns that could be both a
printf or a glob pattern, ffmpeg will assume it is a glob pattern.
@item
You can put many streams of the same type in the output: