[mythtv-users] ivtv capture is good, but mythtv hoses it

Aaron Nauman mtense at gmail.com
Wed Jun 27 03:26:39 UTC 2007


I tried changing the bitrate and stream type to several different values
with no improvement.

Finally, I gave up on running myth on fedora on my setup.  Installed ubuntu
(fiesty fawn) and the jitter problems are gone.

Thanks for everyone's help.

Aaron

On 6/26/07, Michael T. Dean <mtdean at thirdcontact.com> wrote:
>
> On 06/25/2007 10:42 PM, Aaron Nauman wrote:
> > Does anyone have any idea whether the changes in the ivtv settings
> > below could cause jitter while capturing?
>
> Use the attached script to find your recording profile details, i.e.:
>
> mysql -umythtv -p mythconverg < recording_profile.sql > results
>
> For comparison, the values I use are value at the bottom of this post.
> It gives basically VCR quality recordings that are 1.15GiB/hr.  Really,
> the AvgBitrate should probably be 4500 and the MaxBitrate should be 6000
> for best quality (anything higher--for either--is wasted bits), but I
> chose quantity over quality (the source is low quality, anyway).  The
> stream type is critical...
>
> Mike
>
>         Profile: Default
>           Width: 720
>          Height: 480
>      StreamType: DVD-Special 2
>     AspectRatio: 4:3
>      AvgBitrate: 2200
>      MaxBitrate: 3000
> AudioSampleRate: 48000
>      MP3Quality: 7
> MPEG2AudioType: Layer II
> AudioBitrateL1: 448
> AudioBitrateL2: 256
>
>
>
>   SELECT recordingprofiles.name as Profile,
>          max(if(codecparams.name = 'width', codecparams.value, '')) as
> Width,
>          max(if(codecparams.name = 'height', codecparams.value, '')) as
> Height,
>          max(if(codecparams.name = 'mpeg2streamtype', codecparams.value,
> '')) as StreamType,
>          max(if(codecparams.name = 'mpeg2aspectratio', codecparams.value,
> '')) as AspectRatio,
>          max(if(codecparams.name = 'mpeg2bitrate', codecparams.value, ''))
> as AvgBitrate,
>          max(if(codecparams.name = 'mpeg2maxbitrate', codecparams.value,
> '')) as MaxBitrate,
>          max(if(codecparams.name = 'samplerate', codecparams.value, ''))
> as AudioSampleRate,
>          max(if(codecparams.name = 'mp3quality', codecparams.value, ''))
> as MP3Quality,
>          max(if(codecparams.name = 'mpeg2audtype', codecparams.value, ''))
> as MPEG2AudioType,
>          max(if(codecparams.name = 'mpeg2audbitratel1', codecparams.value,
> '')) as AudioBitrateL1,
>          max(if(codecparams.name = 'mpeg2audbitratel2', codecparams.value,
> '')) as AudioBitrateL2
>     FROM recordingprofiles, codecparams
>    WHERE recordingprofiles.id = codecparams.profile
>      AND codecparams.name IN ('width', 'height', 'mpeg2streamtype',
>                               'mpeg2aspectratio', 'mpeg2bitrate',
>                               'mpeg2maxbitrate', 'samplerate',
> 'mp3quality',
>                               'mpeg2audtype', 'mpeg2audbitratel1',
>                               'mpeg2audbitratel2')
> GROUP BY codecparams.profile\G
>
>
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>
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