Various issues with Vero 4k

Took a bit of time to look at John Wick 2 myself today.
It freezes on the motorbike and the decoder gets stuck and has to be reset.

[ 1571.026078] [0]H265 dec err local reset.
[ 1571.026216] [0]nal type 39, discard 1
[ 1571.026474] [0]init_decode_head_hw: (3840, 2160) body_size 0xff0000 header_size 0x7f80
[ 1571.026479] [0]hevc_recover HEVC_SHIFT_BYTE_COUNT=bbf10c8

Can you try, before playback:

echo 16 | sudo tee /sys/module/amvdec_h265/parameters/dynamic_buf_num_margin

and confirm if this fixes the stop? I think we just need a little more headroom.

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