setPreferredVideoMimeType/setPreferredVideoRoleFlags don't work for adaptive playbacks

[ojw28]

As per title, the preferred video MIME type(s) don't seem to be used when making adaptive video track selections.

I found this when investigating #9463, where it would have been useful to provide the following as a viable workaround to prefer the H264 adaptation set:

trackSelector.setParameters(
    trackSelector
        .getParameters()
        .buildUpon()
        .setPreferredVideoMimeType(MimeTypes.VIDEO_H264));

[tonihei]

[Solution tracked internally by b/202380939]

[tonihei]

Note: The problem occurs for preferred video role flags, which are also only applied when making a fixed video track selection at the moment.

[rohitninawe]

is there any fix for [#9463 ] ?