On Wed Dec 28 23:13:50 2011
Måns Rullgård wrote:

>>>>> Sometimes the vsynth1-dnxhd_720p_rd test fails on alpha, pa-risc
>>>>> and sparc FATE machines. It explicitly uses '-threads 4' when
>>>>> encoding, and for some reason vsynth1/dnxhd-720p-rd.dnxhd may be
>>>>> spoiled (the first frame contains a small number of randomly placed
>>>>> zero blocks). For comparison, the single-thread mode does not show
>>>>> any issues.
>>>> This sounds threading related. Feel like trying valgrind's Helgrind and/or
>>>> DRD tools to examine this further?
>>>
>>> Thread debugging is another story. I meant that the hard-coded '-threads 4'
>>> option looks rather harmful,
> 
> It is exposing a bug somewhere.  That does not make it harmful in itself.

It overrides the setting from the THREADS variable which was introduced
for a purpose. OTOH there is --disable-pthreads.

Michael
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