[mythtv-users] Firewire fleeting on SA3250HD

[Allan Wilson]

On 7/22/06, John P Poet <jppoet at gmail.com> wrote:
>
> I have been struggling to get *reliable" firewire communication
> between my computer and my SA3250HD cable box.  I got it working last
> night, and scheduled a half dozen shows to record on different
> channels, throughout the night.  They all recorded just beautifully.
>
> Today I noticed a recording start up, and the SA3250HD trying to
> change channels but it went to the wrong one.  I stopped the recording
> and changed the channel myself.  Then I tried to capture via
> test-mpeg2 but got a zero length file.  After about 30 minutes of
> randomly trying things, I got the firewire to work again.... for a
> while.  A few hours later it was out of sync, again.
>
> If I use 1394commander to reset the bus, and use plugctl to prime the
> bus, and get the channel changed to a good one, and use test-mpeg2, I
> can get eventually get a valid video stream.  Once test-mpeg2 is
> working, I can start myth backup and it will work -- for a while.
>
> I have not been able to figure out the sequence of events needed to
> get the 1394 bus resynchronized when it looses it.  Sometimes just
> resetting the bus is enough.  Other times it seems like various
> combinations of plugctl and test-mpeg2 are necessary.
>
> I get the impression that people with Motorola boxes have a bit more
> success with this, than those of us with Scientific Atlanta boxes.
>
> The very first time I ever successfully captured video via firewire,
> It was after I followed Allan's directions here:
>
> http://www.gossamer-threads.com/lists/mythtv/users/209409#209409
>
> Unfortunately, those instructions do not work every time.
>
> Since I cannot remember where I got it, I am attaching the version of
> sa3250ch.c that works (most of the time) for me.
>
> John
>
>
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>
>

Just an idea but could you be changing to an encrypted channel that causes
you to loose your connection to the cable box. I had to create a new listing
and tie that listing to my firewire tuner so that firewire would only pickup
recording and change to channels it could get to. Just an idea

Allan
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