Merge commit 'c47cdf837c1b52681a84f434443e1f993757a5e9' into release/2.2
* commit 'c47cdf837c1b52681a84f434443e1f993757a5e9': img2dec: correctly use the parsed value from -start_number Merged-by: Michael Niedermayer <michaelni@gmx.at>
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