Large resolution videos are aliased

[M-Pixel]

SPECIFIC ISSUE ENCOUNTERED

Playing a video that has a significantly higher resolution than that of the screen (e.g. 4K video on a flat plane that takes up ~90° FOV on a Daydream device with 1280x1440 screens, resulting in higher than 1 texel density), results in the video rendering as highly aliased.

HARDWARE/SOFTWARE VERSIONS

• Unity: 2019.1.2f1
• Google VR SDK for Unity: 1.200
• Device manufacturer, model, and O/S: Lenovo Daydream Solo, Android Oreo
• Device fingerprint: Lenovo/vega/vega:8.0.0/OVR1.190228.001/5343941:user/release-keys
• Device display metrics: mBaseDisplayInfo=DisplayInfo{"Built-in Screen", uniqueId "local:0", app 1440 x 2560, real 1440 x 2560, largest app 1440 x 2560, smallest app 1440 x 2560, mode 1, defaultMode 1, modes [{id=1, width=1440, height=2560, fps=75.0}], colorMode 0, supportedColorModes [0], hdrCapabilities android.view.Display$HdrCapabilities@1d6308, rotation 0, density 400 (537.882 x 537.388) dpi, layerStack 0, appVsyncOff 1000000, presDeadline 13333333, type BUILT_IN, state OFF, FLAG_SECURE, FLAG_SUPPORTS_PROTECTED_BUFFERS, removeMode 0}
• Google VR Services: 1.20.234682102.release_aio
• Link to Unity project that reproduces the issue: https://github.com/googlevr/media-app-template/

STEPS TO REPRODUCE THE ISSUE

1. Play a 4K video
2. Your eyes will scream

ADDITIONAL COMMENTS

The essential question at hand here is: where can we restrict the resolution of the texture that ExoPlayer renders to, in the way that GVR Unity sets it up? I dug around in the gvr-exoplayersupport source code for answers, but it's rather circuitous and I'm relatively unfamiliar with the Android ecosystem, so I wasn't able to identify any place where the surface size could be specified.