[mythtv-users] Help with playback issue on recordings from a single channel

David Engel david at istwok.net
Sun Dec 26 03:20:46 UTC 2021

On Sat, Dec 25, 2021 at 01:16:11PM -0800, Gary Buhrmaster wrote:
> On Sat, Dec 25, 2021 at 4:54 PM David Engel <david at istwok.net> wrote:
> > For the macroblocking, it could be the infamous, Nvidia bug that has
> > plagued their MPEG2 decoders for the last 10+ years.
> Always possible, but most of the OTA stations that
> were initially reported to manifest that bug were NBC
> affiliated stations (especially the O&O's) such that I
> presume many purchased the same encoder based
> upon some corporate recommendation(*) (maybe bulk
> purchase?)  Since most CBS stations also broadcast
> in 1080i, perhaps some of them have gotten a good
> deal on a shiny new encoder too (I think PBS stations
> also typically use 1080i, but I have not checked).  As
> with all such generalities, there are exceptions to
> formats and impacts.

I still see it on my local, NBC station.  I briefly saw it on my
local, PBS staton but haven't seen it there in years.  I also saw it
on my local, ABC station until a year ago when they switched from
1080i to 720p.


> (*) It may have also coincided with most of (at least)
> the O&O's needing to squeeze in more NBC, Cozi,
> LX, and Telemundo subchannels at higher quality,
> so they might have wanted a more capable encoder
> that pushed the standard(s) to the limits (and beyond
> the nvidia implementation).

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David Engel
david at istwok.net

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