Date: Mon, 27 Jun 2005 14:40:37 +0200 (CEST) From: Svein Halvor Halvorsen <svein-freebsd-questions@theloosingend.net> To: questions@freebsd.org Subject: VHS to DVD conversion: problem with firewire, nfs, whatever Message-ID: <20050627142841.U38273@maren.thelosingend.net>
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I'm trying to convert some of my old VHS cassettes to DVDs as those are more practical to hadle, and since the tape is becomming worn. I don't have a video-in intercafe on my wideo card, but I do have a digital MiniDV camcorder with the ability to do analog-digital pass-through by connection the output from my VCR tol A/V and the firewire link to my PC. I then press play on the VCR and use fwcontrol -R on my PC to cature. Peace of cake! However: The fwcontrol utility prints out "n blocks padded" once about every minute, and "fwohci0: IR DMA buffer overrun" gets printed on the console. I guess my computer is not fast enough to receive the data, and that this might have something to do with the fact that I'm saving the fwcontrol output over NFS. Problem is that my laptop don't have the needed 13 GB/hour storage space, and that my only firewire-controller is on that said laptop. However, I have a hard time grasping that this should be a problem. I need about 3.6 MB/s tranfer rate, and when dd-ing from /dev/zero to a file on the NFS-mounted filesystem, I get more than twice of that. Also the fw-bus seems fast enough, because I don't get these buffer overruns when saving to local disk (at least not as often, just once or twice an hour). Can someone please point me to where I could find some info on either tuning NFS or my firewire bus. Could I pipe the output through some kind of buffer on its way to the nfs-mount, that could help a possibly unstable network transfer rate? How would I go about doing this? Any pointers? Svein Halvor
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