[mythtv-users] MythArchive won't write to my DL DVD

John Pilkington J.Pilk at tesco.net
Sun Jan 14 10:09:05 UTC 2007

Kevin J. Cummings wrote:

>> :-( /dev/dvd: 4173824 blocks are free, 4391419 to be written!
>> :-( write failed: No space left on device

> Obviously mytharchive is trying to write too much information to my DVD.
>  Shouldn't this have been caught during the "Create DVD" setup screens
> when I selected my videos?

This looks like the problem I had with the DVD iso image being too big.
I posted around 22 Dec on the user and (later) the dev list.

>> I think the problem arises because mythburn aims to create an image that 
>> > fills the physical storage capacity of the dvd, making no allowance for 
>> > formatting overheads.  The Mytharchive menu quotes available capacity as 
>> > 4.38 Gb, disk capacity as 4482 Mb; in the version that I have (FC5 
>> > atrpms) mythburn uses the latter.  It's an easy edit - does anyone have 
>> > a definitive value?

> After several trials I got an image that K3b wrote successfully when the 
> initial value of dvdrsize in mythburn.py was changed from 4482 to 4330.
> K3b reported the size of the written image as 4487 Mb, still apparently 
> 5Mb above threshhold.
> Mythburn uses a guesstimate (?) of 1.05 for the factor by which 
> multiplexing will increase the size of the video component, so YMMV.

I'm now using a dvdrsize of 4300 in > 
/usr/share/mythtv/mytharchive/scripts/mythburn.py  (ATrpms fc5)
and get writable images.

> #Single and dual layer recordable DVD free space in MBytes
> #dvdrsize=(4482,8964)
> dvdrsize=(4300,8600)


John Pilkington

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