[MPlayer-users] Tips on TV-encoding performance
st_barszus at gmx.de
Sun Aug 10 11:46:15 CEST 2003
Am Sonntag, 10. August 2003 11:29 schrieb rcooley:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> I've been using mencoder on my system to record to MPEG4 in realtime
> from my TV-tuner card, but it uses up just about all of my CPU power, so
> I'm unable to do anything else with the system without dropping frames.
> I really need to be able to playback on this sytem at the same time I
> am encoding. If anyone has even the most trivial suggestion to improve
> performance, I'd like to hear it.
> But first, I'll cover a few things I've already tried, and their
> results, maybe someone can find where I went wrong.
> Here is the command-line I currently use:
> nice -n -19 mencoder -nocache -tv
> crop=640:472:40:4,pp=md -ovc lavc -lavcopts
> vcodec=mpeg4:vbitrate=1000:vqcomp=0.0:vhq -oac mp3lame -lameopts
> Here is all the information about my system:
> Mencoder command-line above.
> BTTV Module Options:
> options bttv card=78 tuner=2 radio=1 pll=1 autoload=1 fieldnr=1 gbuffers=32
> options tuner type=2
> options i2c scan=1 verbose=1 i2c_debug=0
> hdparm args: -A1 -a64 -c1 -d1 -m16 -p4 -S240 -X66 -Xmdma2
> OS: Gentoo 1.4rc1
> All software compiled with "-march=athlon-xp"
> Actual Hardware:
> AMD Athlon XP 2000+ 1.666GHz Processor
> Asus A7S333 Mobo
> 256MB PC2700 DDR RAM
> Western Digital 40GB HDD, 7200RPM, 2MB Cache
> KWORLD TV878RF-PRO BTTV Tuner Card
Without being an expert i would say your hardware is really enough to do what
you want. I have seen a slower machine (Athlon TB 1333) capturing fullscreen
(720x576) mpeg4 and mp3. What you could try is to take a higher bitrate for
video, at least that helped a friend of mine. What belongs to the dropping of
audio I really don't know whats going on. On the above setup we tried to
capture using uncompressed audio and after a fixed time mencoder started to
drop audioframes, recompiling and using mp3lame he can record some hours. On
another machine even mp3lame has the same symptoms, alltough neither the
hd-load nor the cpu-load justifies it. Maybe mencoder has a problem here ?
Since I have a digital tv card i'm not that familiar with all that ....
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