From owner-freebsd-firewire@FreeBSD.ORG Sun Nov 6 21:39:05 2005
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Date: Sun, 06 Nov 2005 13:39:06 +0000
From: Dieter <freebsd@sopwith.solgatos.com>
Cc:
Subject: Sending DV to camcorder over firewire gives dropouts
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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.
This is with the camcorder in "VCR" mode, and stopped (not recording).
The computer is otherwise idle.
The dropouts are very regular and repeatable, so it probably isn't due to
an occasional transmission error, or the computer being busy for a moment.
Wild Guess Theory #1:
fwcontrol -S reports:
3948 frames, 131.50 secs, 30.02 frames/sec
784 frames, 25.92 secs, 30.24 frames/sec
3597 frames, 119.78 secs, 30.03 frames/sec
Shouldn't this be 29.97 fps ?
Wild Guess Theory #2:
Perhaps the flow-control / buffer-management isn't quite right,
and the camcorder runs out of data?
From owner-freebsd-firewire@FreeBSD.ORG Sun Nov 6 22:09:03 2005
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Sun, 06 Nov 2005 14:08:59 PST
Date: Sun, 6 Nov 2005 14:08:59 -0800 (PST)
From: Arne "Wörner" <arne_woerner@yahoo.com>
To: freebsd@sopwith.solgatos.com, freebsd-multimedia@freebsd.org,
freebsd-firewire@freebsd.org
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Cc:
Subject: Re: Sending DV to camcorder over firewire gives dropouts
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Hi!
--- Dieter <freebsd@sopwith.solgatos.com> wrote:
> 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.
>
Sweet...
(I am just watching "Dude! Where is my car?) :-))
> 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.
>
> This is with the camcorder in "VCR" mode, and stopped (not
> recording).
> The computer is otherwise idle.
>
> The dropouts are very regular and repeatable, so it probably
> isn't due to
> an occasional transmission error, or the computer being busy for
> a moment.
>
> Wild Guess Theory #1:
>
> fwcontrol -S reports:
>
> 3948 frames, 131.50 secs, 30.02 frames/sec
> 784 frames, 25.92 secs, 30.24 frames/sec
> 3597 frames, 119.78 secs, 30.03 frames/sec
>
> Shouldn't this be 29.97 fps ?
>
I like that theory:
I found in ffmpeg's man page the following option:
-r fps
set frame rate (default = 25)
Dude! Did you use the "-r" option?
Maybe you could do some experiments:
1. -r 40
2. -r 25
3. -r 20
4. -r 30
and watch for the length of drop outs and inter-mittance-time (is
that the right word? I mean: The time between drop outs)...
-Arne
__________________________________
Yahoo! Mail - PC Magazine Editors' Choice 2005
http://mail.yahoo.com
From owner-freebsd-firewire@FreeBSD.ORG Mon Nov 7 03:09:32 2005
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To: "Arne " W rner "" <arne_woerner@yahoo.com>
In-reply-to: Your message of "Sun, 06 Nov 2005 14:08:59 PST."
<20051106220859.52887.qmail@web30304.mail.mud.yahoo.com>
Date: Sun, 06 Nov 2005 19:09:23 +0000
From: Dieter <freebsd@sopwith.solgatos.com>
Cc: freebsd-multimedia@freebsd.org, freebsd-firewire@freebsd.org
Subject: Re: Sending DV to camcorder over firewire gives dropouts
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> > Wild Guess Theory #1:
> >
> > fwcontrol -S reports:
> >
> > 3948 frames, 131.50 secs, 30.02 frames/sec
> > 784 frames, 25.92 secs, 30.24 frames/sec
> > 3597 frames, 119.78 secs, 30.03 frames/sec
> >
> > Shouldn't this be 29.97 fps ?
> >
> I like that theory:
>
> I found in ffmpeg's man page the following option:
> -r fps
> set frame rate (default = 25)
>
> Dude! Did you use the "-r" option?
No, didn't need to, ffmpeg figured out to use 29.97 fps
all by itself, for both input and output.
Even if there is something wrong with the output of ffmpeg,
it would not explain why I get the exact same problem with:
[ push "play" button on camcorder ]
fwcontrol -R filename.dv
[ push "stop" button on camcorder ]
fwcontrol -S filename.dv
since ffmpeg is not involved in this case.
It might be that the incorrect fps numbers reported are just
an artifact of clock resolution and the relatively short times
involved and packetization/buffering?
From owner-freebsd-firewire@FreeBSD.ORG Mon Nov 7 11:02:02 2005
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From: FreeBSD bugmaster <bugmaster@freebsd.org>
To: freebsd-firewire@FreeBSD.org
Cc:
Subject: Current problem reports assigned to you
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Current FreeBSD problem reports
Critical problems
Serious problems
S Submitted Tracker Resp. Description
-------------------------------------------------------------------------------
o [2004/11/22] kern/74238 firewire [firewire] fw_rcv: unknown response; fire
o [2005/07/24] kern/83999 firewire [firewire] [patch] panic in fw_bus_explor
o [2005/08/29] kern/85434 firewire [fwip] fwip (IP over firewire) doesn't wo
3 problems total.
Non-critical problems
S Submitted Tracker Resp. Description
-------------------------------------------------------------------------------
o [2004/12/12] kern/74977 firewire [modules] dcons.ko requires KDB support
1 problem total.
From owner-freebsd-firewire@FreeBSD.ORG Fri Nov 11 00:39:55 2005
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Date: Thu, 10 Nov 2005 16:23:52 +0000
From: Dieter <freebsd@sopwith.solgatos.com>
Cc:
Subject: Sending DV over firewire gives dropouts - VT6306 vs NEC uPD72871/2
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> 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