Date: Wed, 3 Dec 1997 00:29:58 +0100 (MEZ) From: Robert Eckardt <roberte@MEP.Ruhr-Uni-Bochum.de> To: multimedia@freebsd.org Subject: fxtv-0.46 to raw device Message-ID: <199712022329.AAA26946@ghost.mep.ruhr-uni-bochum.de>
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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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