Re: [libdv-dev] jvc grdvl557 audio sample failure

[Nathan K. <nat...@sp...>]

Damjan Lango wrote:
> I have a JVC grdvl557 camcorder and when I play (with playdv) the 
> grabbed dv (with dvgrab) I get full of errors like:
> 
> asf 00:00:00.04 2005-01-12 01:43:27 7f b7 08 12 1/48 # audio
> block/sample failure for 0 blocks, 32 samples of 1280
> 
> and the audio is skipping, but this skipping is actually caused by X 
> and gnome-terminal using almost 100% of cpu just displaying the 
> errors, so if I just redirect them to /dev/null (2>/dev/null) then i 
> don't hear any audio problems, so are these error messages valid? Or
> can they be safely ignored?

Hi Damjan, see these threads:

http://sourceforge.net/mailarchive/forum.php?thread_id=6067089&forum_id=5458
http://sourceforge.net/mailarchive/message.php?msg_id=10436594

Essentially, I had the same problem with a JVC GRDVL28 (PAL), and it is
considered to be a bug with JVC's DV implimentation, not libdv.

I ended up ripping DV with:
	dvgrab --format raw
or
	cat /dev/dv1384 > raw.dv #press play on dv camera
                                  #stop when finished and CTRL-C
(using appropriate device name for your kernel)

I have an Athlon XP 3000, and didn't have any problem with the output of 
these error lines, but when playing back I found minor audio sync 
issues. I experimented with decoding the raw DV using ffmpeg's DV 
decoder to see if handled it any differently, but didn't have time to 
find a conclusive result.

-Nathan