[mythtv-users] Fox Chicago (WLFD) OTA HD - Nearly unwatchable

Steven Adeff adeffs.mythtv at gmail.com
Wed Mar 21 13:29:42 UTC 2007

On 3/21/07, matthew.garman at gmail.com <matthew.garman at gmail.com> wrote:
> I'm trying to record over-the-air HD via a pchdtv-5500.  It
> generally seems to work, except with Fox (WFLD).  In particular, my
> girlfriend's "American Idol" recordings are almost too lousy to
> watch.  The recordings will have a lot of "jumps" and studdering.
> Immediately prior to and following one of these blips is a lot of
> blocky pixelation and artifacting of the video.
> During playback, my CPU is only at about 30%.  Also, the problem
> areas are not random---i.e., if we rewind/rewatch the recording, the
> problems are always the same and in the same location.
> The first time we recorded this show, these problems only happened a
> few times throughout the video.  The most recent recording, though,
> had this problem every couple minutes or so.
> As far as we can tell, we haven't had this problem with other
> channels.  But even within Fox, we haven't had these problems with
> the animated shows we record ("The Simpsons", "The Family Guy").
> According to antennaweb.org, we're 17.5 miles from *all* broadcast
> towers (I believe all stations are broadcast from atop the Sears
> Tower).  Unless Fox's signal strength is lower than its peers, it
> seems like we should have this problem with all channels.
> Our antenna is a cheap "rabbit ears and circle thing" sitting on top
> of a speaker.  I believe we have an older version of this:
> http://tinyurl.com/2asujb
> I'm not really sure where to start debugging this: new antenna,
> mythtv, etc.  I'm hoping someone on this list has experience with
> this and/or some more insight into Chicagoland Fox.
> FWIW, below is the frontend log creating during playback of
> "American Idol", somewhat edited for brevity (the original log is
> 700+ lines long!).
> Thanks for any help, suggestions or ideas!
> Matt
> 2007-03-20 23:13:18.340 TV: Attempting to change from None to WatchingPreRecorded
> 0: start_time: 8566.145 duration: 658.585
> 1: start_time: 8566.108 duration: 658.587
> 2: start_time: 8566.106 duration: 658.591
> stream: start_time: 95178.957 duration: 7318.038 bitrate=11494 kb/s
> 2007-03-20 23:13:18.366 AFD: Opened codec 0x4ede220, id(MPEG2VIDEO) type(Video)

how's the signal quality on that channel, sounds like your just
missing data? Does the recorded length look correct? usually when
packets go missing the time shown is a lot shorter.

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