https://www.blu-ray.com/faq/
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Data transfer rate (data) 36.0Mbps (1x)
Data transfer rate (video/audio) 54.0Mbps (1.5x)
Video resolution (max) 1920×1080 (1080p)
Video bit rate (max) 40.0Mbps
Something’s wonked out because, offically, 50000 bitrate won’t even play in modern blue ray 1.5x unless you leave out sound, at least for now..future 8x firmware is coming. Time to throw out my old blue ray.
I know of no software encoders that can go above 40,000. What would be the point of non-working disks? They might be looking to re-encode your video, so 50 is a buffer zone against generation loss.
My take is recommend them getting an uncompressed monster or slightly compressed rgb. Any other work-arounds are welcome.
According to the Blu-ray Disc specification, 1x speed is defined as 36Mbps. However, as BD-ROM movies will require a 54Mbps data transfer rate the minimum speed we’re expecting to see is 2x (72Mbps). Blu-ray also has the potential for much higher speeds, as a result of the larger numerical aperture (NA) adopted by Blu-ray Disc. The large NA value effectively means that Blu-ray will require less recording power and lower disc rotation speed than DVD and HD-DVD to achieve the same data transfer rate. While the media itself limited the recording speed in the past, the only limiting factor for Blu-ray is the capacity of the hardware. If we assume a maximum disc rotation speed of 10,000 RPM, then 12x at the outer diameter should be possible (about 400Mbps). This is why the Blu-ray Disc Association (BDA) already has plans to raise the speed to 8x (288Mbps) or more in the future.