[mythtv-users] Channel scanner won't find a specific channel

Sat Feb 6 14:57:01 UTC 2016

On 06/02/16 14:13, David Parker wrote:
> On Feb 6, 2016 5:33 AM, "John Pilkington" <J.Pilk at tesco.net
> <mailto:J.Pilk at tesco.net>> wrote:
>  >
>  > On 06/02/16 04:52, David Parker wrote:
>  >>
>  >> On Fri, Feb 5, 2016 at 11:02 PM, David Parker
> <parker.david.a at gmail.com <mailto:parker.david.a at gmail.com>
>  >> <mailto:parker.david.a at gmail.com <mailto:parker.david.a at gmail.com>>>
> wrote:
>  >>
>  >>     Hello,
>  >>
>  >>     I've made a ~100 MB sample available here:
>  >>
>  >>
> https://drive.google.com/file/d/0BypQdHvM5DGjeF9jT1NzcDVEbjA/view?usp=sharing
>  >>     [1]
>  >>
>  >>     This is the first 54 seconds of the recording which I have been
>  >>     testing with this whole time.  This file is choppy when played
>  >>     through MythTV, but plays fine everywhere else.  It even plays just
>  >>     fine in the Google player which shows in browser when you first
>  >>     click the link.
<snip>
>  >>     2. The original recording and the 100 MB sample I extracted both
>  >>     stutter terribly in MythTV.  But the version created using
>  >>     "mythtranscode -m" plays perfectly.  Any idea why?
>  >>
>  >>     Thanks John for the mythtranscode tip.  This is a bit less of a
>  >>     show-stopper now, since it looks like I can record from this channel
>  >>     and then run a mythtranscode job to fix the video.  I still don't
>  >>     know why this particular channel causes such trouble, though, but
>  >>     only for MythTV.
>  >>
>  >>
>  >> Left out one thing.  Also tried watching the channel but pausing for 30
>  >> seconds to let it buffer a bunch of the stream.  No difference, playback
>  >> was still choppy in the buffered video (which I guess makes sense
>  >> because it's choppy in recorded video, too).
>  >>
>  >>      - Dave
>  >>
>  >
>  > Mostly it plays fine for me in 0.28-beta, both as a recording and as
> a video.  The programme change at the start feels jumpy, but thereafter
> it's smooth.  I've run mediainfo on the complete clip and on a clip
> without the first 35 MB, and compared the outputs using diff -y
>  >
>  > There are changes in GOP setting, A/V delay and number of text
> streams but nothing looks catastrophic at first glance.
>  >
>  > Playback data shows up to 30% cpu on both cores in a core2duo 2.8 GHz
> i915 box.
>  >
>  > Format settings, BVOP                    : Yes
> Format settings, BVOP                    : Yes
>  > Format settings, Matrix                  : Custom
>   Format settings, Matrix                  : Custom
>  > Format settings, GOP                     : M=3, N=30          |
> Format settings, GOP                     : Variable
>  > Codec ID                                 : 2                    Codec
> ID                                 : 2
>  >
>
> Thanks, John.  Would you be willing to play the video in MythTV with "-v
> playback" in the frontend options, and see if you get a lot of those
> "Video is <n> frames ahead of audio..." messages in the log like I did?
> I'm wondering if those will still show up even though it's playing smoothly.
>
> I really appreciate everyone's help with this.
>
>      - Dave

A few catch-ups at the start, but then smooth.

The progressive/interlaced thing may just be on startup.

Drop the initial 35 MB  - the '35' was picked at random.

dd bs=1M skip=35  count=50 if=WFXVsample1.mpg0 of=WFXVsample1.mpg

Overwrite a local recording.  Probably shouldn't do this at home.

ln -s WFXVsample1.mpg  1001_20160206092400.ts

Build a seektable.  I didn't see any change, but no log of earlier playback.

ionice -c3 mythcommflag -q --rebuild --file 1001_20160206092400.ts

2016-02-06 14:30:45.904673 I  AFD: EIA-608 caption service #1 is in the 
Unknown language.
2016-02-06 14:30:45.904688 I  AFD: EIA-708 caption service #1 is in the 
Undetermined language.
2016-02-06 14:30:45.905092 I  Dec: Selected track #1 (type 5) in the 
Undetermined language(7695972)
2016-02-06 14:30:45.954622 I  Player(0): progressive frame seen after 2 
interlaced frames
2016-02-06 14:30:45.977900 I  VideoOutput: Created YV12 OSD.
2016-02-06 14:30:45.999665 I  Player(0): Disabled deinterlacing
2016-02-06 14:30:46.017291 I  Player(0): Video is 3.22148 frames behind 
audio (too slow), dropping frame to catch up.
2016-02-06 14:30:46.017343 I  Player(0): Video is 3.42013 frames behind 
audio (too slow), dropping frame to catch up.
2016-02-06 14:30:46.017376 I  Player(0): Video is 3.32932 frames behind 
audio (too slow), dropping frame to catch up.
2016-02-06 14:30:46.017565 I  Player(0): Video is 3.00647 frames behind 
audio (too slow), dropping frame to catch up.
2016-02-06 14:30:46.089619 I  Player(0): Video is 4.20656 frames ahead 
of audio,
                         doubling video frame interval to slow down.
2016-02-06 14:30:46.116392 I  Player(0): Video is 5.27975 frames ahead 
of audio,
                         doubling video frame interval to slow down.
2016-02-06 14:30:46.156692 I  Player(0): Video is 5.83654 frames ahead 
of audio,
                         doubling video frame interval to slow down.
2016-02-06 14:30:46.184450 I  Player(0): Video is 6.11725 frames ahead 
of audio,
                         doubling video frame interval to slow down.
2016-02-06 14:30:46.223690 I  Player(0): Video is 6.0648 frames ahead of 
audio,
                         doubling video frame interval to slow down.
2016-02-06 14:30:46.250570 I  Player(0): Video is 5.79866 frames ahead 
of audio,
                         doubling video frame interval to slow down.
2016-02-06 14:30:46.277431 I  Player(0): Video is 5.33609 frames ahead 
of audio,
                         doubling video frame interval to slow down.
2016-02-06 14:30:46.317629 I  Player(0): Video is 4.74123 frames ahead 
of audio,
                         doubling video frame interval to slow down.
2016-02-06 14:30:46.344493 I  Player(0): Video is 4.05329 frames ahead 
of audio,
                         doubling video frame interval to slow down.
2016-02-06 14:30:46.384752 I  Player(0): Video is 3.27435 frames ahead 
of audio,
                         doubling video frame interval to slow down.
2016-02-06 14:30:50.058928 I  Player(0): FPS:   58.82 Mean: 17001 
Std.Dev:  7161 CPUs: 6% 5%
2016-02-06 14:30:52.713818 I  Player(0): 400 progressive frames seen.
2016-02-06 14:30:54.041530 I  Player(0): FPS:   60.02 Mean: 16661 
Std.Dev:  5752 CPUs: 19% 24%
2016-02-06 14:30:58.037549 I  Player(0): FPS:   59.82 Mean: 16717 
Std.Dev:  5784 CPUs: 20% 24%
2016-02-06 14:30:59.378369 I  Player(0): 800 progressive frames seen.
2016-02-06 14:31:02.006722 I  Player(0): FPS:   60.22 Mean: 16605 
Std.Dev:  5970 CPUs: 21% 23%
2016-02-06 14:31:05.989393 I  Player(0): FPS:   60.02 Mean: 16661 
Std.Dev:  5754 CPUs: 20% 22%
2016-02-06 14:31:06.042991 I  Player(0): 1200 progressive frames seen.
2016-02-06 14:31:09.985449 I  Player(0): FPS:   59.82 Mean: 16717 
Std.Dev:  5789 CPUs: 24% 23%
2016-02-06 14:31:11.009388 E  decoding error
                         eno: Unknown error 541478725 (541478725)
2016-02-06 14:31:11.500380 I  waiting for no video frames 0
2016-02-06 14:31:11.500401 I  HasReachedEof() at framesPlayed=1526 
totalFrames=1542
2016-02-06 14:31:11.528125 E  decoding error