[mythtv-users] Analog firewire recordings end early due to 25% fewer frames

Grant McChesney grantmc at gmail.com
Thu Feb 5 16:15:02 UTC 2009


On Thu, Feb 5, 2009 at 1:10 AM, Yeechang Lee <ylee at pobox.com> wrote:

> Sam Logen <starz909 at yahoo.com> says:
> > If there are problems with the SD channels, it's possible it's a
> > corruption somewhere along the line in the mpeg stream, probably due
> > to comcast's poorly implemented firmware.
>
> Astound, actually, not Comcast.
>
> I agree about the poorly-implemented firmware, though. Some more data:
>
> * Just heard from another mailing-list subscriber who also has Astound
>  who arranged to record the same program via FireWire as me as a
>  test. His recording plays back with the correct 29.97 frame rate.
>
> * My recording stopped midway (without mythbackend noticing, as
>  usual), as I half expected. I recently connected the cable box used
>  to my flat panel via component, and so switched to that input. Lo
>  and behold, the panel showed a still frame of the moment where the
>  FireWire connection died! I then used 6200ch to switch channels on
>  the box. Switching to the channel the box was already on didn't do
>  anything other than put the box's own OSD up, but switching to
>  another channel revived the video output and, more interestingly,
>  the recording resumed!
>
> Based on this I assume that the issue is almost certainly defective
> firmware that is on my two boxes (and the boxes they replaced), but
> not on the other list member's box. Another, less likely, possibility
> is some peculiarity with the way Linux interacts with two
> daisy-chained FireWire cable boxes; I'll next try disconnecting one of
> the boxes and see what happens.
>
>
I wonder if you would have the same issue with the newer Motorola STBs.
Have you considered swapping out the DCT-6200 for the DCH-3200?  I just
replaced mine because I wanted HDMI out for my TV connection.
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