[mythtv] Random blockiness that probably isn't CPU or PCI bus
bandwidth-related
Daniel Thor Kristjansson
danielk at mrl.nyu.edu
Mon Jan 10 08:39:27 EST 2005
]recording from one of my ivtv cards, I get intermittent blockiness on
]the HDTV stream.
]Thing is, I get no bttv: buffer overrun errors, except during the
]times I expect them (e.g., another recording starting). This suggests
]the driver is getting the data correctly, but it is being ditched or
]overwritten before mythtv gets it. Does this jive with the
]understanding of some of the HDTV developers here? (Daniel? John?)
This doesn't really jibe with my experience, unless you are running out
of CPU, which shouldn't be the case for a P4 3.2Ghz machine. Of course I
do compile with extra optimizations, even in debug mode. If it is not
the CPU, do the following:
Make sure there are errors in the stream.
Yes - If there are is the signal level too low?
Yes - nothing we can do
No - there may be a bug in the ringbuffer
No - there may be bug in ffmpeg
-- Daniel
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