Sending DV over firewire gives dropouts - VT6306 vs NEC uPD72871/2

Dieter freebsd at
Fri Nov 11 00:39:56 GMT 2005

> AMD64 running FreeBSD 6.0 beta3.
> Canon DV NTSC camcorder connected via firewire.
> Playing a tape and recording it on the computer via
> 	fwcontrol -R filename.dv
> appears to work fine.
> Sending the video back to the camcorder via
> 	fwcontrol -S filename.dv
> mostly works, but every 1.5-2 seconds or so I get a momentary
> dropout of both video and audio.  I get the same dropouts
> with a dv file created by "fwcontrol -R" and with dv files created
> by ffmpeg.

New info: The controller giving the dropouts is a VT6307
(reported as VT6306 ?).
I added a firewire card with NEC uPD72871/2, and using this
firewire controller the DV files play back without the dropouts.

fwohci0: <VIA Fire II (VT6306)> port 0xa800-0xa87f mem 0xfdffe000-0xfdffe7ff irq 10 at device 6.0 on pci1
fwohci0: OHCI version 1.10 (ROM=1)
fwohci0: No. of Isochronous channels is 4.
fwohci0: Phy 1394a available S400, 2 ports.
fwohci0: Link S400, max_rec 2048 bytes.
fwohci0: node_id=0xc800ffc0, gen=1, CYCLEMASTER mode

fwohci1: <NEC uPD72871/2> mem 0xfdeff000-0xfdefffff irq 10 at device 8.0 on pci2
fwohci1: OHCI version 1.0 (ROM=1)
fwohci1: No. of Isochronous channels is 4.
fwohci1: Phy 1394a available S400, 2 ports.
fwohci1: Link S400, max_rec 1024 bytes.
fwohci1: max_rec 1024 -> 2048
fwohci1: node_id=0x8000ffc0, gen=1, non CYCLEMASTER mode

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