avformat/img2dec: Skip checking the input files existence if it has already been opened
Avoids a unneeded open
Fixes part of Ticket4849
Signed-off-by: NMichael Niedermayer <michael@niedermayer.cc>
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Avoids a unneeded open
Fixes part of Ticket4849
Signed-off-by: NMichael Niedermayer <michael@niedermayer.cc>