[mythtv-users] Time length is incorrect on some HD captures

[belcampo]

Tom Flair wrote:
> Here's something that has been bugging me for a little while now.   Many 
> (most?) programs I capture off of firewire in HD show an incorrect 
> length when playing back on any frontend.  There aren't any artifacts to 
> the program and nothing is actually lost when compared to an original 
> broadcast.
> 
> As the most recent example, I give you Stargate Universe.  It's a 1 hour 
> program.  Any of my frontends play it back without issue, but the info 
> within the frontend shows it is 51:57 in length.   If I look at the same 
> program in MythWeb, it states the program is 1 hr.   ffmpeg -i gives a 
> length of 00:59:55.31.   This is only a nuisance, but I'm curious as to 
> what is causing it.
Could it be the sum of 'skip-times' ?
> 
> The only thing I've done to these captures is commercial skip, no 
> transcoding, editing or time-stretching.  The machine or box does not 
> matter, both backends with these recordings have these results.
> 
> 
> Full ffmpeg -i follows
> Seems stream 0 codec frame rate differs from container frame rate: 59.94 
> (60000/1001) -> 29.97 (30000/1001)
> Input #0, mpegts, from '1855_20100423200000.mpg':
>   Duration: 00:59:55.31, start: 60519.268622, bitrate: 11597 kb/s
>   Program 1
>     Stream #0.0[0x800]: Video: mpeg2video, yuv420p, 1920x1080 [PAR 1:1 
> DAR 16:9], 38810 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
>     Stream #0.1[0x801]: Audio: ac3, 48000 Hz, 5.1, s16, 384 kb/s
> At least one output file must be specified
> 
>  From the frontend output when said program is playing back on my desktop.
> 2010-04-24 07:18:12.183 TV: Attempting to change from None to 
> WatchingPreRecorded
> 2010-04-24 07:18:12.783 AFD: Opened codec 0x7fba144b85c0, id(MPEG2VIDEO) 
> type(Video)
> 2010-04-24 07:18:12.783 AFD: codec AC3 has 6 channels
> 2010-04-24 07:18:12.784 AFD: Opened codec 0x7fba1430f4c0, id(AC3) 
> type(Audio)
> 2010-04-24 07:18:12.785 Opening audio device 'PulseAudio:default'. ch 
> 2(2) sr 48000 (reenc 0)
> 2010-04-24 07:18:12.887 VideoOutputXv: XVideo Adaptor Name: 'Nouveau 
> GeForce 8/9 Textured Video'
> 2010-04-24 07:18:12.962 OSD Theme Dimensions W: 640 H: 480
> 2010-04-24 07:18:13.001 TV: Changing from None to WatchingPreRecorded
> 2010-04-24 07:18:13.001 Realtime priority would require SUID as root.
> 2010-04-24 07:18:13.003 Video timing method: USleep with busy wait
> 2010-04-24 07:18:13.034 ScreenSaverX11Private: DPMS Deactivated 1
> 
> 
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> 
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