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- dvconnect is a small utility to send / capture raw data from / to the
- camcorder over an OHCI complient IEEE 1394 firewire adapter. It has to be
- an OHCI adapter since we use the video1394 interface. (It could be done for
- receiving without it, but for sending it's the only way to go!)
-
- You should also install the latest Linux Kernel version (> 2.4.12 I think)
- since otherwise the necessary patches for DV _sending_ are not included.
-
- dvconnect was written to be simple and fast.
- If it doesn't work for you, you might want to check out dvgrab from
- Arne Schirmacher... (http://www.schirmacher.de)
-
- Since the video1394 interface is not fully developed, you have to do some
- parameter twiddling to make it work.
-
- First, do
-
- modprobe ohci1394
- modprobe video1394
-
- Then try to catch some test-video data using:
-
- dvconnect >test.dv
-
- Verify, using playdv if you are in doubt.
-
- If that worked, try
-
- dvconnect -s --syt-offset=OFFSET <test.dv
-
- to send the data back to your camcorder. Where OFFSET is some number between
- 10000-26000. The default is 11000 (should work for everyone, but
- in fact it doesn't...) You know, that you got it, when the picture in the view
- finder stands still and no gray boxes are jumping around anymore.
-
- If your harddisk is not fast enough or your system is under load then you
- can control the user-space memory buffer using -b and the kernel buffer
- using -k.
-
- The kernel buffer should be large enough to bring dvconnect over
- one scheduler slice. (approx 1/10 second)
- The user-space memory buffer should be large enough to compensate
- for varying disk transfer rates. (defaults to 10 seconds on PAL)
-
- dvconnect will always warn you, if you got broken frames but
- only if it is in capture mode!
-