Date: Tue, 02 Dec 1997 19:00:08 -0800 From: Amancio Hasty <hasty@rah.star-gate.com> To: Robert Eckardt <roberte@MEP.Ruhr-Uni-Bochum.de> Cc: multimedia@FreeBSD.ORG Subject: Re: fxtv-0.46 to raw device Message-ID: <199712030300.TAA02134@rah.star-gate.com> In-Reply-To: Your message of "Wed, 03 Dec 1997 00:29:58 %2B0100." <199712022329.AAA26946@ghost.mep.ruhr-uni-bochum.de>
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Hi Randall ;-) Where is the support for yuv? To the list: With yuv support we can capture more frames to disk,eliminate the intermediate file or files and feed the raw yuv file to mpeg_encode;in essence we can double our capture time. Tnks! Amancio > Hi (Randall ;-) > > using a Haupauge video card I tried capturing a minute or so to disk. > (FreeBSD-2.2.2, fxtv-0.46, bt848.971105, > P133, ASUS TVP4, 64MB, HDs: WD (IDE) and IBM (IDE+SCSI/ncr53c810), > Hauppauge WinCast/TV, Temic PAL tuner + SoundBlaster 16 Virge PnP) > I used MPEG output mode. > > However, the captured sequence has a lot of "hickups". > (several ppm-files are 5- to 48-fold hard links) > (This is with PAL/BDGHI, 25fps, 256x192) > (ideal would be 384x288 @ 25fps) > Even reducing the rate to 15 fps didn't get rid of them. > > I tried spreading the raw files over 3 disks yielding only a > small improvement (5- to 11-fold hard links). > > Therefore I tried to write to a raw partition (rwd1s2). > But, after "Converting RAW to PPM...", which produced indeed a lot > of ppm-files, the next step "Failed reading raw image file". > (trying to convert sound ?) > > Even after looking at the source, I still dont't understand why. ??? > > > Another thing I noticed: > dd bs=4k count=10000 if=/dev/zero of=/dev/rwd1s2 gives me > 6307378 bytes/sec, running smoothly. > Using fxtv on that device lets the disk heads scatter (swap ?) > and Optimize only gives 256x192@24fps with no CPU- or disk-intensive > processes running. > > > Finally, is it planned or is s.o. already working on converting > a RAW-file directly (e.g., a stream of piped commands) to an > MPEG-stream ? > Wouldn't this be the canonical approach on a Unix system ? > > It seems that the intermediate steps use much more disk space > then the raw file (ca. 200MB for a min., but my partition with > 780MB free runs out of space already for 1 1/2 min.). > > > TIA, > Robert > > -- > Robert Eckardt \\ FreeBSD -- solutions for a large universe.(tm) > RobertE@MEP.Ruhr-Uni-Bochum.de \\ What do you want to boot tomorrow ?(tm) > http://WWW.MEP.Ruhr-Uni-Bochum.de/~roberte > For PGP-key finger roberte@gluon.MEP.Ruhr-Uni-Bochum.de
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