On Mon, Oct 13, 2003 at 11:43:12PM -0700, Mark K. Kim wrote: > I think samplerate is for audio and fps is for video. I recommand keeping > fps at 15 (or higher, if your system can handle it) and samplerate low. > It should be decent. > > Because the avi created by xawtv has no compression, you'll need to > compress it after generating the video. mplayer comes with a program > called mencoder that's *really* nice for that purpose. After a successful > installation of mplayer with all of Windows codecs, you can generate a > small MPEG4 avi with something like this: > > in=input.avi > out=output.avi > > for p in 1 2 > do > mencoder $in -channels 1 -srate 11025 -oac copy \ > -ovc lavc -lavcopts \ > vcodec=msmpeg4:vbitrate=496:vpass=$p -o $out > done > > You can also compresses audio with lame (see the man page for the -oac > option) but I'm not sure how legal that is. Anyway, the above is a > two-pass system and a webpage I've read recommended that technique but > there are other ways to make it happen, too. The above is just one way. > Play with the bitrate for better quality. > > I hope that helps!
Also check out the mjpegtools, ffmpeg and transcode. I'll post the URLs and sample shell scripts tomorrow when I boot up my video processing machine. Right now, I'm heading to bed. :-) > -Mark > > > On Mon, 13 Oct 2003 [EMAIL PROTECTED] wrote: > > > ok, i've been playing around with this for awhile, and the results are > > not great. i recorded the opening theme of southpark under different > > settings. the default settings of: > > > > samplerate: 44100 > > frames: 12 fps > > > > produce a file of 72MB for about 26s of video. the video is bad, > > but watchable if i'm jonesing for southpark. if it weren't a cartoon, > > it would truly be unwatchable. > > > > i bumped the sample rate up to 48000, however both the video quality and > > filesize don't change. what exactly is the difference between > > samplerate and fps anyhow? so then i bumped it up: > > > > samplerate: 44100 > > frames: 20 fps > > > > the video quality was ok. certainly watchable, but not "high quality" > > by any stretch of the imagination. the filesize is 120MB for 26s. i'm > > already at about 1/6 - 1/7 of the capacity of a CD. there's no way a 20 > > minute video will fit on a CD. just out of curiosity, i bumped it up > > again to: > > > > samplerate: 44100 > > frames: 30 fps > > > > the video was good, but still not high quality. the filesize is a > > whopping 183MB for 26s. my computer (1.4MHz athlon) is working hard to > > keep sync with audio. > > > > > > i just upgraded my kernel to 2.4.22, and didn't bother installing the > > low latency patch this time around. i guess i can try that tomorrow > > evening. > > > > i'm a little disheartened. quake3 can get to very high framerates with > > ease; my machine does q3 very nicely. but then again, that's all > > hardware accelerated opengl stuff. > > > > but in any event, it's filesize that seems to be the show stopper here. > > at this rate, a 20min video will take somewhere between 5GB and 8GB. > > this is unreasonable. > > > > > > > > i'm exhausted and about to call it a night. does anybody have > > suggestions on how to get good quality video at reasonable filesize? > > > > should i be working in a format other than AVI? > > > > pete > > > > > > > > > > > > > > On Mon 13 Oct 03, 9:06 PM, Mark K. Kim <[EMAIL PROTECTED]> said: > > > I think the driver needs to support saving videos. > > > > > > Assuming it does, run xawtv with -noxv option, 'cuz it can't save videos > > > when the video is coming through the xvideo extension. Then select > > > "Record Movie" from the menu, then change "movie driver: multiple image > > > files" to one of the valid movie formats. Supply the "movie/images > > > filename", then click "start/stop recording." That works for me but I > > > don't use hauppauge so... > > > > > > Good luck! > > > > > > -Mark > > > > > > > > > On Mon, 13 Oct 2003 [EMAIL PROTECTED] wrote: > > > > > > > hi all, > > > > > > > > i owned a microsoft OS for a few weeks before switching to linux. in > > > > those few weeks, i bought a hauppauge wincast TV card. it worked > > > > marginarlly well, but the driver had "issues". > > > > > > > > anyway, i installed linux soon after and completely forgot about the > > > > card, giving up on it ever being supported by linux. that was back in > > > > the redhat 5.1 days, and supported hardware was ... sparse. > > > > > > > > anyway, i recently came across the card and did some research. it's now > > > > supported by linux! hooray! after... > > > > > > > > reading ~linux/Documentation/video4linux/bttv > > > > recompiling the kernel > > > > figuring out how to connect the card to my soundcard > > > > playing with sound settings > > > > hooking the card up to my VCR > > > > > > > > i got the card to work. it took a bit long to get working under linux, > > > > but it's much less flakey. the windows driver crashed very often, > > > > making the card painful to use (one of the reasons why i forgot about > > > > the card). > > > > > > > > anyway, i want to put some of my old VCR tapes onto hard drive and > > > > perhaps eventually burn them to DVD. > > > > > > > > > > > > has anybody ever done this? i can use xawtv to watch my tapes, but for > > > > some reason, it doesn't want to record. it refuses to record the movie > > > > to disk (although i can get screenshots). > > > > > > > > i'm about to go to freshmeat, but if anybody does this kind of thing, > > > > i'd like to hear what you use and about your experiences with this kind > > > > of software. i'm a TOTAL newbie with video on linux, but i'd like to > > > > get acquainted with it. > > > > > > > > thanks! > > > > pete > > > > -- > > GPG Instructions: http://www.dirac.org/linux/gpg > > GPG Fingerprint: B9F1 6CF3 47C4 7CD8 D33E 70A9 A3B9 1945 67EA 951D > > _______________________________________________ > > vox-tech mailing list > > [EMAIL PROTECTED] > > http://lists.lugod.org/mailman/listinfo/vox-tech > > > > -- > Mark K. Kim > http://www.cbreak.org/ > PGP key available on the website > PGP key fingerprint: 7324 BACA 53AD E504 A76E 5167 6822 94F0 F298 5DCE > > _______________________________________________ > vox-tech mailing list > [EMAIL PROTECTED] > http://lists.lugod.org/mailman/listinfo/vox-tech -- R. Douglas Barbieri [EMAIL PROTECTED] http://www.dooglio.net vi: "The way God meant for man to edit text files..." Get GPG and get secure! http://www.gnupg.org/ GPG Server : pgp.mit.edu GPG ID : C55B91D4 Fingerprint: FE6A 6A57 2B95 7594 E534 BFEE 45F1 9E5E F30A 8A27
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