[vox-tech] ripping video: wierd interleaving effect on fast motion

[Matt Holland]

David Margolis wrote:
> OK,
> 
> I'm jumping into this conversation late, but here are my  2 cents.
> 
> 1. I have a KWorld el-generico TV tuner that works just fine with
> bttv and xawtv.  I believe it is the same chipset that comes in the
> Haupaggue (spelling?) cards. I love xawtv.  It is one of the _killer apps_
> for sure.  I configured all the settings in .xawtv and got exactly the
> TV in a window while I'm reading my e-mail I was looking for.
> 
> 2. I've tried serveral combinations of recording with xawtv and mencoder
> and ending up with nothing even remotely inspiring.  I always hoped I
> could write scripts called by cron to do some serious command line
> PVRing, but haven't gotten close yet.  It's got to be possible, right?
> That's what TIVO is all about: Linux with a TV Card, a nice case, some
> specialized software, and a remote control.

You might want to check out MythTV (http://mythtv.org).  I haven't used 
it, because my TV card can only capture under Windows, but it looks like 
a very slick project.  If nothing else, you might get some tips from 
looking around.

Also, I've found the mplayer-users list (archived on mplayerhq.hu) to be 
a useful source of video capture/encoding tips.

Matt

> 3. Here is the part I don't get!  These cards are supposed to do HARDWARE
> MPEG 1 and 2 encoding.  Savign to AVI and then re-encoding into some MPEG
> format seems like ripping MP3s into WAV and then back out to OGG.  I admit
> I don't get how any of this works, but shouldn't it be more straigtforward
> to just _catch_ the already encoded MPEG data and put it somewhere???
> 
> Dave M.
> 
> On Tue, 14 Oct 2003 p@dirac.org wrote:
> 
> 
>>hi all,
>>
>>ok, i ripped a southpark video with:
>>
>>   System: AMD Athlon 1.3GHz
>>           2.4.22 w/ low latency
>>           Radeon QD
>>           very unloaded machine
>>
>>   name:         southpark1.avi
>>   ripper:       xawtv -noxv
>>   audio format: 8bit mono
>>   sample rate:  44100
>>   video format: 24bit TrueColor (LE: bgr)
>>   fps:          30
>>   video size:   384x288
>>
>>
>>the next step is to compress/encode it.
>>
>>however, i first tried to watch the avi with mplayer.  the quality was
>>bad.  whenever there was fast motion, it looked like the areas with fast
>>motion had white horizontal lines interleaved with the normal video.
>>
>>mplayer gave output which looks like it's related to this problem:
>>
>>   badly interleaved AVI file.  switching to -ni mode.
>>
>>i'm not sure what to do.  i don't think it's a matter of my system not
>>being powerful enough.  i did tests at low fps of a few seconds of
>>video, and got the same "interleaved" effect.  it was actually worse at
>>lower fps.
>>
>>and there really aren't that many options with xawtv.  i've played with
>>fps, sample rate, and video format.  nothing seems to help.
>>
>>in xawtv, there are options to save as "single file raw video" and
>>"apple quicktime" format.  i take it these are container formats that
>>sam was talking about.
>>
>>any suggestions?
>>
>>thanks!
>>pete
>>
>>--
>>GPG Instructions: http://www.dirac.org/linux/gpg
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> 
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