hi, 

did you try mpg_buffers=30 ? 

adding it to the line ... 
options ivtv tuner=38 ivtv_std=3 tda9887=0 mpg_buffers=30

and hdparm tuning ? 
i use this one : 
all_args="-d1 -W0"

d1 is for enable ultra dma 
W0 is disable cache of the hard disk
i diisable the cache cause i think it's useless... 
i doesn't acces repeatitively to the same data... 
the result with the cache is that data transit via the cache 
it takes time and make hard drive geeting heat for nothing... 

i ve had ENC IRQ OVERFLOW too 
but not since i did the changes... 
maybe it's just coincidence... 
time will say it to me :) 

++


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