codec: videotoolbox: handle kVTVideoDecoderReferenceMissingErr
The kVTVideoDecoderReferenceMissingErr error is not a critical one, but without it being handled here, it would lead to aborting with VideoToolbox and falling back to Software. Reproduced this with a sample provided by zhilizhao(赵志立), related to !1790. I assume that before this error code was introduced in macOS 12/iOS 15, VT did just return the NULL image buffer with a success status code, leading to the issue seen in !1790. (cherry picked from commit f7434e60) Signed-off-by:Marvin Scholz <epirat07@gmail.com>
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