[FFmpeg-devel] [RFC] First shot for EXIF metadata...

[Paul B Mahol]

On 7/27/13, Stefano Sabatini <stefasab at gmail.com> wrote:
> On date Thursday 2013-07-25 18:18:04 +0200, Thilo Borgmann encoded:
>> Hi,
>>
>> this patch is crappy and full of "don't do"-s and is really meant for
>> getting
>> comments on the following question only:
>>
>> => Why is the metadata dictionary lost (from AVFrame->metadata)?
>>
>> I compared setting it with what lavc/tiff.c does but cannot find the
>> clue...
>>
>> I test this with "ffprobe -show_frames <file>".
>
>> The pointer to the metadata ffprobe gets is NULL (ffprobe.c, in
>> show_frame())
>> for a jpeg with EXIF, but valid for a TIFF with some tags...
>
> Frame metadata is honoured only by the TIFF decoder, for a TIFF
> encoder implementation see:

And by PNG decoder.

> https://github.com/kuehnelth/libav/commits/geotiff-encoder
>
> Also some filters are able to create metadata in the frame, and can be
> displayed through some twisted combination of ffprobe with the lavfi
> device.
>
> Since recently you can also print the metadata in the frame itself
> through drawtext, and this is all for what regards our current frame
> metadata support state of the art.
>
>>
>> Any help is appreciated, thanks!
>
> Will review the patch later (note: git format-patch is favored for
> testing purposes).
>
> [...]
> --
> FFmpeg = Faithful and Frenzy Multipurpose Philosophical Esoteric Gadget
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