[mythtv-users] Strange time counter issue with recent NBC OTA recordings

[Tom Dexter]

On Thu, Nov 14, 2013 at 3:47 AM, John Pilkington <J.Pilk at tesco.net> wrote:
> On 14/11/13 03:42, Tom Dexter wrote:
>>
>> I record New York City OTA stations and am running MythTV 0.25.3.
>>
>> For the last couple of weeks, all my NBC (channel 4.1) recordings have
>> had strange things happening with the progress time counters.  The
>> shows record and play just fine...nothing missing or anything else
>> like that.  What's odd is that, while a one hour show will in fact
>> show as having a length of 1:00:00 or thereabouts, the progress while
>> it's playing will go from 0 to 50 minutes.  Also, if I jump to 50
>> minutes or anything past that, it ends up at the end of the show.
>>
>> NBC has had a long history of mixing frame rates and other odd stuff.
>> If I remember correctly, in earlier versions of MythTV things like
>> this that used to cause MythTV to report incorrect show lengths.  I
>> figured this may be something similar.
>>
>> Anyone else noticing anything like this?
>>
>> Thanks
>> Tom
>
>
> This sounds like seektable trouble.  Does mythcommflag --rebuild improve
> matters?
>
> ISTR that commits that probably aren't in 0.25.3 store time marks as well as
> frame numbers in or around the seektables to handle variable frame rates.
> Doesn't explain why it's suddenly happening for you, though.
>
> John P
>

It seemed a little unlikely to me that this would be a seektable
issue, given that it's happening specifically (and only) on NBC
recordings starting a couple of weeks ago.  Also, just like previous
frame rate issues I recall in the past with NBC is does *not* occur
with things like reality shows, but rather only with things like
dramas were they tend to do this sort of stuff.

However as a test I decided to try a seektable rebuild on one of the
shows with this issue.  Whatever is going on with the frame rates or
whatever there is apparently enough to trip up that reuild.  The
progress went up to a bit over 80% (exactly 50 minutes / 60 minutes),
and failed with this:

mythcommflag --rebuild --chanid 1041 --starttime 20131111220100
2013-11-14 17:59:00.590753 C  mythcommflag version: fixes/0.25
[vmythtv-0.25.3] www.mythtv.org
2013-11-14 17:59:00.590830 C  Qt version: compile: 4.8.4, runtime: 4.8.4
MythTV Commercial Flagger, building seek table for:
    The Blacklist - General Ludd
Rebuild started at Thu Nov 14 17:59:00 2013
Rebuild completed at Thu Nov 14 18:01:09 2013
2013-11-14 18:01:09.077420 E  decoding error
            eno: Input/output error (5)

Strange one...like I said...progress counter aside, these shows
actually play perfectly.

Tom