On Sun, 19 Nov 2006, Delio Pereira Guimaraes wrote:
> > Do the audio and video remain in sync?...
>
> No, they are in sync. If there's some difference, it's only about a quarter of
> a second or less. Only the movie length is shortened.
Ok - and I begin to form a theory about what is happening.
> Sure, I use an almost silent pentium 233mmx running a ltsp terminal to a
> server that is an Athlon 800 with 512MB of memory. I run kmail, firefox and
And I thought 1GB was small :)
> I think there's no problem with the DV file.
I agree.
> Panasonic PV330 (VHS camcorder)
> Sony TRV340 (Hi8 DV camcorder)
I think that's what is called a "Digital8" camcorder. I had a similar
unit and it used Hi8 tapes but recorded DV format data.
> The DV file is complete! It occupies about 14G in the harddisk.
> I disconnect everything and then I convert it to mpeg.
12GB/hr for DV. If you're using AVI or 'dv2' instead of 'raw' then
the overhead is quite a bit higher and 14GB or so per hour would be
correct.
> Now it generated file nat.mpeg, see size comparison with first natal_old.mpg
> file with lots of parameters and second file natal.mpg with the suggested
> parameters.
> ==========================================================
> [EMAIL PROTECTED] ~]$ ls -lrt nat*.mp*g
> -rw-rw-r-- 1 delio delio 2474954752 Nov 4 23:56 natal_old.mpg
> -rw-rw-r-- 1 delio delio 3488636928 Nov 5 05:49 natal_caluje_old.mpg
> -rw-rw-r-- 1 delio delio 2527358976 Nov 18 17:48 natal.mpg
> -rw-rw-r-- 1 delio delio 3547518976 Nov 18 23:34 natal_caluje.mpg
> -rw-rw-r-- 1 delio delio 1576384512 Nov 19 14:52 nat.mpeg
Those look reasonable to me. Slight variation but that is expected.
> And xine showed a length of about 20 minutes!
But how long does Xine need to play the file?
"show a length" is not reliable for variable bitrate files!
I think xine is dividing the file length by the the bitrate in
the MPEG-2 header and using that as the duration of the movie. But
that calculation assumes a 'constant bitrate' and does not work
with variable bitrate files.
> I'm now converting the file to a DV type2 using kino. I'll encode that file
I always use 'raw'. Less overhead (does not have a 2nd copy of the
audio data in the file) and, a little less disc space. Also with 'raw'
you can do emergency or quick edits using dd" (raw DV has a frame
size of 120000 bytes/frame for NTSC, 144000 for PAL)
If the DV file is OK and if mpeg2enc has no bugs then I would not
worry about the estimated times that xine is printing out.
Cheers,
Steven Schultz
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