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I am the owner of Raspberry Pi 4B with 2GB RAM and latest Raspbian OS.
I already did some basic testing with HTML5 FullHD video or with Youtube and 1080p video, but playback is jerky and definitely not smooth.
I tried legacy GL driver and also fake KMS with GPU memory is setup to 256MB. I tried different combinations but without success.

Is even possible to get what I want on RPi4?

My current CHROMIUM_FLAGS are:
CHROMIUM_FLAGS="${CHROMIUM_FLAGS} --ignore-gpu-blacklist --enable-one-copy-rasterizer --enable-gpu-rasterization --enable-native-gpu-memory-buffers --enable-checker-imaging --enable-quic --site-per-process --enable-tcp-fastopen --disable-features=MaterialDesignBookmarks --disable-gpu-compositing --enable-fast-unload --enable-experimental-canvas-features --enable-scroll-prediction --answers-in-suggest --ppapi-flash-path=/usr/lib/chromium-browser/libpepflashplayer.so --ppapi-flash-args=enable_stagevideo_auto=0 --ppapi-flash-version= --max-tiles-for-interest-area=512 --num-raster-threads=4 --default-tile-height=512"

chrome://gpu output:

Graphics Feature Status
Canvas: Hardware accelerated
Flash: Hardware accelerated
Flash Stage3D: Hardware accelerated
Flash Stage3D Baseline profile: Hardware accelerated
Compositing: Hardware accelerated
Multiple Raster Threads: Enabled
Out-of-process Rasterization: Disabled
OpenGL: Enabled
Hardware Protected Video Decode: Unavailable
Rasterization: Hardware accelerated
Skia Renderer: Enabled
Video Decode: Unavailable
Viz Display Compositor: Enabled
Vulkan: Disabled
WebGL: Hardware accelerated
WebGL2: Hardware accelerated
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    This is maybe chromium (or bandwidth) because even the model 1 boards will play an (H.264) Youtube video in full HD. – goldilocks Apr 6 at 18:57

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