[Bug 773208] vp9: Add support for 10 bit and other subsampling / alpha

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773208

--- Comment #3 from Seungha Yang <pudding8757 at gmail.com> ---
A question is that we've been using mapping of libav's AV_PIX_FMT_YUV420P10LE
to GST_VIDEO_FORMAT_I420_10LE but it seems to incorrect, since the decoding
result of this file using avdec_vp9 causes broken video frame (when it is
rendered). 
https://storage.googleapis.com/media.webmproject.org/devsite/vp9/output/hdr/2pass_HDR_strobe_scientist_6Mbps-static.webm 

(AV_PIX_FMT_YUV420P10BE, AV_PIX_FMT_YUV422P10LE, AV_PIX_FMT_YUV422P10BE,
AV_PIX_FMT_YUV444P10LE, AV_PIX_FMT_YUV444P10BE) seems to also incorrectly
mapped.

So, I guess above FFMPEG formats might be unsupported format by Gstreamer.
Instead, mapping AV_PIX_FMT_YUV420P16LE with GST_VIDEO_FORMAT_I420_10LE seems
correct.

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