avformat/matroskaenc: Avoid allocation for small dynamic buffers
By using avio_get_dyn_buf() + ffio_free_dyn_buf() instead of
avio_close_dyn_buf() + av_free() one can avoid an allocation + copy for
small dynamic buffers (i.e. small master elements).
Signed-off-by: NAndreas Rheinhardt <andreas.rheinhardt@gmail.com>
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