QuoteIs there any way to get it both (Boblight AND hardware decoding)?
Yes/No. Devices that run GBM/DRMPRIME graphics do not support software grabbers at the current time, and I have low expectation of that changing anytime soon as it will be a non-trivial feature to implement. Ambilight/Boblight setups either need to stick with older images that use legacy display pipelines, or switch to an external HDMI grabber (which being a hardware solution, has no dependency on software).