[mythtv-users] Fixing broken recordings

[Mark Perkins]

> On 22 Jan 2014, at 12:32 pm, "Yan Seiner" <yan at seiner.com> wrote:
> 
> I have a bunch of recordings from the XXIX Olympics.  My reception was not the best, and the files have some issues, mostly with sound.
> 
> mplayer plays them just fine.  But when I try to commflag them or transcode them in myth, the jobs die wth:
> 
> yan at NewMoon:~/src$ /usr/bin/mythcommflag --file "1161_20080824233500.mpg" --method=all
> 2014-01-21 16:26:01.919143 C  mythcommflag version: fixes/0.27 [v0.27-133-g99f5464] www.mythtv.org
> 2014-01-21 16:26:01.919172 C  Qt version: compile: 4.8.1, runtime: 4.8.1
> MythTV Commercial Flagger, flagging commercials for:
>    XXIX Summer Olympics - Volleyball, Closing Ceremony
> 2014-01-21 16:52:39.555993 E  decoding error
>            eno: Unknown error 541478725 (541478725)

I think the 'decoding error' is just Mythcommflag's way of saying 'reached end of file'. I think the "541478725 (541478725)" is the number of bytes in the file. I get that error on every Mythcommflag job but they always complete successfully. Normally a number is on the next line which will tell you the number of commercials detected.

> 
> I tried rebuilding the seek tables:
> 
> yan at NewMoon:/data21/mythtv/recordings$ mythtranscode --mpeg2 --buildindex --allkeys --showprogress --infile 1161_20080824223000.mpg
> 2014-01-21 16:09:14.595721 C  mythtranscode version: fixes/0.27 [v0.27-133-g99f5464] www.mythtv.org
> 2014-01-21 16:09:14.595755 C  Qt version: compile: 4.8.1, runtime: 4.8.1
> yan at NewMoon:/data21/mythtv/recordings$ /usr/bin/mythcommflag --file "1161_20080824223000.mpg" --method=all
> 2014-01-21 16:10:06.769959 C  mythcommflag version: fixes/0.27 [v0.27-133-g99f5464] www.mythtv.org
> 2014-01-21 16:10:06.769987 C  Qt version: compile: 4.8.1, runtime: 4.8.1
> MythTV Commercial Flagger, flagging commercials for:
>    XXIX Summer Olympics - Beijing Olympic Closing Party
> Finding Logo
> 2014-01-21 16:16:25.644117 E  decoding error
>            eno: Unknown error 541478725 (541478725)
> 2

The 2 means 2 commercials detected.

Commercial detection is far from a precise science. There are some good threads around that go through different things that people have tried. Best bet might be to start a thread detailing what area you are in and the channels you are recording and see if others in a similar situation to you will volunteer settings that work for them.

Many have reported that using all detection methods generates a much worse result than a particular one so some experimentation will probably be in order.

For me (in Australia) mythcommflag rarely ever generates anything usable at all so I rely on a silence detection routine instead for about 60-70% success.

> yan at NewMoon:/data21/mythtv/recordings$
> 
> Any thoughts on fixing these files?  I'm thinking I can use handbrake or some other transcoder to try and clean them up but what settings should I use?
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