Re: DVGRAB

2009/3/30 jole jole <[email protected]>:
> For the first time I use dvgrab ( before windows user, now I "try" ubuntu),
> and now I discover another problem, after some time of capture I had error :
>
> #
> komir@komir-laptop:/media/disk/Stari$ sudo dvgrab -noavc -s 0 -showstatus -d
> 03:10:00 -f dv2 -nostop
> Found AV/C device with GUID 0x08004601021fda7e
> Turning on OpenDML to support large file size.
> Capture Started
>
> 03:57:30
> "dvgrab-001.avi": buffer underrun near: timecode 45:85:85.45 date 2009.03.29

This timecode value is strange because there are only 60 seconds in a
minute and 60 minutes in a hour. This timecode is in the DV stream
received from the device - dvgrab and dependencies merely extracts the
timecode and displays it.

> 03:57:30
> This error means that the frames could not be written fast enough.

In dvgrab 3.2 and earlier versions, this message would be produced
under two different conditions - one for the reason reported. Another
reason would be due to some DV data corruption - missing or invalid
packets that had been dropped. dvgrab uses a firewire library
libiec61883, and in version 1.2.0, I increased the validation testing
on DV packets, which can increase the amount of these errors. The
invalid DV packets was causing some DV parsers and decoders to crash.
dvgrab v3.4 now separates these two error conditions to make the
source of the problem more clear.

For now, there are 2 things for you to investigate and provide more information:

1) send the output of 'ls /sys/bus' so we can see if you are using the
old ieee1394 or new firewire drivers.

2) What kind of storage and filesystem are you writing to? Is it fast
enough to support the file writing for the somewhat high datarate of
DV?

> 2009.03.29 04:06:42Segmentation fault (core dumped)
> #

We have an open bug for some invalid DV data creating a crash in
libdv, which dvgrab uses. Currently, this is what I suspect due to
seeing invalid timecode in the messages. Here is that bug report:

https://sourceforge.net/tracker/?func=detail&aid=2153747&group_id=14103&atid=114103

> komir@komir-laptop:~$ cat /etc/lsb-release
> DISTRIB_ID=Ubuntu
> DISTRIB_RELEASE=9.04
> DISTRIB_CODENAME=jaunty
> DISTRIB_DESCRIPTION="Ubuntu jaunty (development branch)"
>
> same problem  appears  on ubuntu 8.10
>
>
> komir@komir-laptop:~$ aptitude show dvgrab
> Package: dvgrab
> State: installed
> Automatically installed: no
> Version: 3.2-2
> Priority: extra
> Section: universe/graphics
> Maintainer: Ubuntu MOTU Developers <[email protected]>
> Uncompressed Size: 369k
> Depends: libavc1394-0 (>= 0.5.3), libc6 (>= 2.4), libdv4, libgcc1 (>=
> 1:4.1.1),
>          libiec61883-0 (>= 1.1.0), libjpeg62, libquicktime1 (>=
> 2:1.0.3+debian),
>          libraw1394-8, libstdc++6 (>= 4.2.1), zlib1g (>= 1:1.1.4)

-- 
+-DRD-+

------------------------------------------------------------------------------