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avconv: allow no input files.

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It is now possible to use lavfi sources.
This commit is contained in:
Anton Khirnov 2012-08-05 08:37:43 +02:00
parent a5fd7c607f
commit ab29609701
2 changed files with 8 additions and 5 deletions
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5
avconv.c
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@ -2431,11 +2431,6 @@ int main(int argc, char **argv)
exit_program(1); exit_program(1);
} }
if (nb_input_files == 0) {
av_log(NULL, AV_LOG_FATAL, "At least one input file must be specified\n");
exit_program(1);
}
ti = getutime(); ti = getutime();
if (transcode() < 0) if (transcode() < 0)
exit_program(1); exit_program(1);

8
doc/avconv.texi
View File

@ -805,6 +805,9 @@ the matching type.
Output link labels are referred to with @option{-map}. Unlabeled outputs are Output link labels are referred to with @option{-map}. Unlabeled outputs are
added to the first output file. added to the first output file.
Note that with this option it is possible to use only lavfi sources without
normal input files.
For example, to overlay an image over video For example, to overlay an image over video
@example @example
avconv -i video.mkv -i image.png -filter_complex '[0:v][1:v]overlay[out]' -map avconv -i video.mkv -i image.png -filter_complex '[0:v][1:v]overlay[out]' -map
@ -827,6 +830,11 @@ graph will be added to the output file automatically, so we can simply write
@example @example
avconv -i video.mkv -i image.png -filter_complex 'overlay' out.mkv avconv -i video.mkv -i image.png -filter_complex 'overlay' out.mkv
@end example @end example
To generate 5 seconds of pure red video using lavfi @code{color} source:
@example
avconv -filter_complex 'color=red' -t 5 out.mkv
@end example
@end table @end table
@c man end OPTIONS @c man end OPTIONS