avformat/dv: consider a header match at byte 0 to count as detection of dv in probe
This reduces the amount of data needed to identify dv
Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>
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This reduces the amount of data needed to identify dv
Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>