[FFmpeg-devel] [PATCH] avformat/image2: Upon request, make available extra metadata, fields related to input path to be used by filters.

[Alexandre Heitor Schmidt]

Hi there! I'm just writing to make sure this patch wasn't forgotten. :)

Best wishes to you all!

Alex.

On 01/01/2020 17:17, Alexandre Heitor Schmidt wrote:
> The patch follows attached, to avoid formatting issues. The
> commit message is as follows:
>
> avformat/image2: Upon request, make available extra metadata
>  fields related to input path to be used by filters.
>
> libavformat/img2.h: New field export_path_metadata to
> VideoDemuxData to only allow the use of the extra metadata
> upon explicit user request, for security reasons.
>
> libavformat/img2dec.c: Modify image2 demuxer to make available
> two special metadata entries called lavf.image2dec.source_path
> and lavf.image2dec.source_basename, which represents, respectively,
> the complete path to the source image for the current frame and
> the basename i.e. the file name related to the current frame.
> These can then be used by filters like drawtext and others. The
> metadata fields will only be available when explicitly enabled
> with image2 option -export_path_metadata 1.
>
> doc/demuxers.texi: Documented the new metadata fields available
> for image2 and how to use them.
>
> doc/filters.texi: Added an example on how to use the new metadata
> fields with drawtext filter, in order to plot the input file path
> to each output frame.
>
> Usage example:
>
> ffmpeg -f image2 -export_path_metadata 1 -pattern_type glob
>  -framerate 18 -i '/path/to/input/files/*.jpg'
>  -filter_complex drawtext="fontsize=40:fontcolor=white:
>  fontfile=FreeSans.ttf:borderw=2:bordercolor=black:
>  text='%{metadata\:lavf.image2dec.source_basename\:NA}':x=5:y=50"
>  output.avi
>
> Fixes #2874.
>
> Signed-off-by: Alexandre Heitor Schmidt <alexandre.schmidt at gmail.com>
>