(posted this earlier on ffmpeg-soc, but it seems like libav-user is
more appropriate)

Hi folks,

Does the libavfilter framework support accessing AVStream metadata
from within my avfilter?  In particular, I want to execute some filter
code only if certain metadata is present (in my case, a QT
transformation matrix).

Looking through the SOC code, I guess one option is to
re-open/re-parse the input file (ala vsrc_movie.c), but it seems like
there should be a cleaner way.

Thanks,
Norbert
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