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When a decoder buffer is flushed, parts of the private context is reset,
which may affect show_streams().
Example:
ffprobe -of flat fate-suite/ac3/mp3ac325-4864-small.ts \
-analyze_frames -show_entries stream=ltrt_cmixlev
Before: ltrt_cmixlev="0.000000"
After: ltrt_cmixlev="0.707107"
Currently, it seems that only ac3 downmix info is concerned.
(ac3 downmix options are exported since 376bb8481a).
Fix regression since 045a8b15b1.
Signed-off-by: Nicolas Gaullier <nicolas.gaullier@cji.paris>