Mailing List Archive: MythTV: Dev

wrong size calculation in mytharchive

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tino.keitel at gmx

Feb 27, 2008, 1:24 AM

Post #1 of 6 (1566 views)
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wrong size calculation in mytharchive

Hi folks,

my mytharchive is wrong when it comes to the size calculation before
the dvdauthor run:

Total size of video files, before multiplexing, is 3963 Mbytes, audio
is 275 MBytes, menus are 1 MBytes.

That makes 4239 MB (with 1 MB = 1048576 bytes). However, DVD+/-R have a
capacity of at least 4480 MB (4482 or 4482 IIRC).

As a result, tcrequant is used but it's not really necessary, as the
videos should fit on one DVD without tcrequant.

Regards,
Tino

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J.Pilk at tesco

Feb 27, 2008, 1:41 AM

Post #2 of 6 (1463 views)
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Re: wrong size calculation in mytharchive [In reply to]

Tino Keitel wrote:
> Hi folks,
>
> my mytharchive is wrong when it comes to the size calculation before
> the dvdauthor run:
>
> Total size of video files, before multiplexing, is 3963 Mbytes, audio
> is 275 MBytes, menus are 1 MBytes.
>
> That makes 4239 MB (with 1 MB = 1048576 bytes). However, DVD+/-R have a
> capacity of at least 4480 MB (4482 or 4482 IIRC).
>
> As a result, tcrequant is used but it's not really necessary, as the
> videos should fit on one DVD without tcrequant.
>
> Regards,
> Tino

From Mythburn.py:

#Add a little bit for the multiplexing stream data
totalvideosize=totalvideosize*1.08

but I found when playing with Mythburn that the totalaudiosize will
include both mp2 and ac3 files. I had at that time disabled the
immediate deletion of the mp2 source and tcrequant was more aggressive
than normal.

HTH

John P

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tino.keitel at gmx

Feb 27, 2008, 1:57 AM

Post #3 of 6 (1475 views)
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Re: wrong size calculation in mytharchive [In reply to]

On Wed, Feb 27, 2008 at 09:41:39 +0000, John Pilkington wrote:
> Tino Keitel wrote:
> > Hi folks,
> >
> > my mytharchive is wrong when it comes to the size calculation before
> > the dvdauthor run:
> >
> > Total size of video files, before multiplexing, is 3963 Mbytes, audio
> > is 275 MBytes, menus are 1 MBytes.
> >
> > That makes 4239 MB (with 1 MB = 1048576 bytes). However, DVD+/-R have a
> > capacity of at least 4480 MB (4482 or 4482 IIRC).
> >
> > As a result, tcrequant is used but it's not really necessary, as the
> > videos should fit on one DVD without tcrequant.
> >
> > Regards,
> > Tino
>
> From Mythburn.py:
>
> #Add a little bit for the multiplexing stream data
> totalvideosize=totalvideosize*1.08
>
> but I found when playing with Mythburn that the totalaudiosize will
> include both mp2 and ac3 files. I had at that time disabled the
> immediate deletion of the mp2 source and tcrequant was more aggressive
> than normal.

I don't have any ac3 files in the work directory, only .mv2 and .mp3,
if that matters.

I now just selected the DVD-DL as a workaround. However, this won't
work well when I really want to use tcrequant, as it will leave 240 MB
of the DVD unused when I select a single layer DVD size.

Regards,
Tino
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tino.keitel at gmx

Feb 27, 2008, 2:40 AM

Post #4 of 6 (1452 views)
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Re: wrong size calculation in mytharchive [In reply to]

Hi,

for the records: the resulting image that was created with the DVD-DL
size to avoid unnecessary tcrequant fits on a single layer DVD-R, there
are even more than 100 MB space unused:

$ du -sm mythburn.iso
4368 mythburn.iso

Regards,
Tino
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J.Pilk at tesco

Feb 27, 2008, 3:37 AM

Post #5 of 6 (1456 views)
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Re: wrong size calculation in mytharchive [In reply to]

Tino Keitel wrote:
> Hi,
>
> for the records: the resulting image that was created with the DVD-DL
> size to avoid unnecessary tcrequant fits on a single layer DVD-R, there
> are even more than 100 MB space unused:
>
> $ du -sm mythburn.iso
> 4368 mythburn.iso
>
> Regards,
> Tino
The difficulty is in knowing how much extra space will be used by
remultiplexing before before the remultiplexing is done. Currently set
at 8 percent.

'tail mythburn.log' will tell you the number of extents actually written.

John P
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tino.keitel at gmx

Feb 27, 2008, 5:16 AM

Post #6 of 6 (1459 views)
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Re: wrong size calculation in mytharchive [In reply to]

On Wed, Feb 27, 2008 at 11:37:59 +0000, John Pilkington wrote:
> Tino Keitel wrote:
> > Hi,
> >
> > for the records: the resulting image that was created with the DVD-DL
> > size to avoid unnecessary tcrequant fits on a single layer DVD-R, there
> > are even more than 100 MB space unused:
> >
> > $ du -sm mythburn.iso
> > 4368 mythburn.iso
> >
> > Regards,
> > Tino
> The difficulty is in knowing how much extra space will be used by
> remultiplexing before before the remultiplexing is done. Currently set
> at 8 percent.
>
> 'tail mythburn.log' will tell you the number of extents actually written.

2236347 extents written (4367 MB)

Regards,
Tino
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