ffmpeg: check return value of avio_closep for progress report
avio_closep is not guaranteed to succeed, and its return value can contain information regarding failure of preceding writes and silent loss of data (man 2 close, man fclose). Users should know when the progress was not successfully logged, and so a diagnostic is printed here. Reviewed-by: Michael Niedermayer <michael@niedermayer.cc> Reviewed-by: James Almer <jamrial@gmail.com> Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
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