Quantcast KVCD: VBV Size Setting? - digitalFAQ.com Forums [Archives]
  #1  
08-14-2002, 09:43 AM
obrigado obrigado is offline
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hi netlanders.

when using some K-templates I got
underflow results. This won't necessarily
make the MPEG file unusable but might
lead to A/V sync problems, stuttering,
and such.

After some investigation I found out that
some frames got larger than the predefined
buffer size, mostly I-frames.

So when using larger "maximum bitrate"
it would be advisable to set the VBV to a
higher value in MPEG1 encoding.
Some templates only issue 40 KB, others
are 48 KB.

I set this value
MPEG.Video.VBVBufferSize
to at least
64 KB or 96 KB ( at high CQ and
upper limit of 2400 kbps). The values are
65536 or 98304.

The increase
of the resulting filesize is virtualy NIL.

Like the hole K-issue this does not conform
to MPEG1 standard, but I haven't seen
any problems yet. Probably because
standalone DVD player have to work to
even much bigger VBV size in MPEG2
(e.g. 224).

Just give it a try and you might have less
problems than b4.

Obrigado
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  #2  
08-14-2002, 11:02 AM
kwag kwag is offline
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Hi obrigado.
I found out that the "Center" best value is 48K. Higher than 58 or lower than 42, start giving problems on some DVD players. I personally have 5 DVD players, and at 48, they all play fine. Above 58, a couple of players start skipping.

-kwag
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  #3  
08-15-2002, 03:17 AM
obrigado obrigado is offline
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-> KWAG

thanx 4 ur reply:

>Higher than 58 or lower than 42, start
>giving problems on some DVD players. I
>personally have 5 DVD players, and
>at 48, they all play fine. Above 58, a
>couple of players start skipping.

you're probaly right, I've just tested this
on 2 players (Panasonic and Daewoo).

But several time in the past I've got
"error writing stream" of TMPGenc
when I tried to encode at a higher
upper-bps-limit
(because there was same space left on
the CD which I intended to invest in better
pic quality).

This has been solved by increasing the
VBV size.

Obrigado
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