Re: Lost frames, or what else?

On Tue, May 4, 2010 at 3:40 PM, Andrea Giuliano <[email protected]> wrote:
> Dear Carl,
>
> I made another test and now I couldn't say if the stops happens when
> kino is writing to disk.
>
> But at present I'm running another test with dvgrab, and something even
> more strange is happening: for most part of the tape (it's a 60 min 8mm
> tape) the output from dvgrab was quite smooth, but round 30/35 minutes,
> after 6 or 7 DV files already dumped on disk, the counters in the output
> (frames, MiB and timecode) stops quite often, but no errors are issued.
> The stops maybe short of long, sometimes very long (even some seconds!)
> I can only interpret such a behaviour this way: dvgrab stops counting
> frames because it just can't see any frame on the firewire card.

run this while you are transfering
tristan@tristan-laptop:~$ tail -f /var/log/syslog

I am wondering if the driver is reporting anything.

>
> The test is running right now, and the 9th DV file were written more
> smoothly than the previous one. I know that this part of the tape was
> recorded without a steady (I'm not sure this is the right term), so the
> handycam moved very much in all directions. Could the "complexity" of
> some scenes influence the analog/digital converter? I don't think so, at
> least because it never did before.

No, the compression happens as the camera is writing to tape.  when
streaming from tape, it is just reading bytes from tape and sending
them over firewire.  not much processing at all.  same on the dvgrab
side: read from firewire, write to disk.

>
> Best regards.
>
> On Tue, 2010-05-04 at 12:55 -0500, Carl Karsten wrote:
>> Use kino so you can watch while is saves to disk and see if this
>> happens then.
>>
>> Contact Canopus, they are verry helpull, likely will exchange the
>> device.
>>
>> > On May 4, 2010 12:47 PM, "Andrea Giuliano" <[email protected]>
>> > wrote:
>> >
>> > Dear Dan,
>> >
>> > thanks for your kind answer. So you think it could be a problem with
>> > the
>> > firewire card. I have another one, so I could try that instead. I
>> > must
>> > also say that the 6pin plug of the Canopus is not working anymore
>> > except
>> > for the power. I must use the other 4pin plug for capturing, and the
>> > 6pin one for powering on the device. I strongly hope it's not
>> > damaged, I
>> > bought it just a couple of months ago and it was quite expensive, at
>> > least for me!
>> >
>> > Indeed, I couldn't say whether the two thing are linked some how.
>> >
>> > Best regards.
>> >
>> >
>> >
>> > On Tue, 2010-05-04 at 10:30 -0700, Dan Dennedy wrote:
>> > > On Tue, May 4, 2010 at 9:49 AM, Andrea Giul...
>> >
>> > ------------------------------------------------------------------------------
>> > _____________________...
>> >
>>
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> --
> Andrea Giuliano <[email protected]>
>
>



-- 
Carl K

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