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

[David Margolis]

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.

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
>
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