mac-vth264: Fix video info set logic
In the vt_h264_video_info function, the format of the video to be encoded is always being set to VIDEO_FORMAT_NV12, dispite the presence of code to set the video format to VIDEO_FORMAT_I420 or VIDEO_FORMAT_I444. This commit fixes that function to respect the video format choice of the user. In addition, whilst testing this fix initially, I also discovered that the 4:4:4 colour format is not supported by the VideoToolbox H264 encoder. Looking at the VideoToolbox code in ffmpeg as a reference, the ffmpeg code errors out if a color format other than NV12 or I420 is set. Therefore, this commit also logs a warning about I444 not being supported, and uses the NV12 default.
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