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Diffstat (limited to 'doc/filters.texi')
| -rw-r--r-- | doc/filters.texi | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index be70a2396b..7ff9948239 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -171,6 +171,17 @@ within the quoted text; otherwise the argument string is considered terminated when the next special character (belonging to the set @samp{[]=;,}) is encountered. +A special syntax implemented in the @command{ffmpeg} CLI tool allows loading +option values from files. This is done be prepending a slash '/' to the option +name, then the supplied value is interpreted as a path from which the actual +value is loaded. E.g. +@example +ffmpeg -i <INPUT> -vf drawtext=/text=/tmp/some_text <OUTPUT> +@end example +will load the text to be drawn from @file{/tmp/some_text}. API users wishing to +implement a similar feature should use the @code{avfilter_graph_segment_*()} +functions together with custom IO code. + The name and arguments of the filter are optionally preceded and followed by a list of link labels. A link label allows one to name a link and associate it to a filter output |