dxva: support DXGI_FORMAT_420_OPAQUE decoding
Some devices (some phones, apparently) will support only this opaque
format. Of course this won't work with CLI, because copying data
directly is not supported.
Automatic frame allocation (setting AVCodecContext.hw_device_ctx) does
not support this mode, even if it's the only supported mode. But since
opaque surfaces are generally less useful, that's probably ok.
Merges Libav commit
5030e3856c2126fb829edb828f5aae011d178eb4.
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
projects / ffmpeg / commit