avformat/matroskaenc: fix handling of VFW style raw rgb
raw rgb uses 0 as codec tag in "VFW", the code assumed 0 means error
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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raw rgb uses 0 as codec tag in "VFW", the code assumed 0 means error
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>