Bug#716702: brasero: Corrupt files in DVD-R burning

[Thomas Schmitt]

Hi,

i expect that Brasero 2.30 is too old for getting support.
Probably you should try to reproduce the problem with a newer
version.

Your suspicion about missing burn-free cannot be outruled.
DVD-R do get sent a mode page 05, where burn-free can be
enabled or disabled by the "BUFE" bit.
(Most other DVD types and BD do not get mode page 05 and thus
 have no adjustable burn-free. Mostly because they can stand
 buffer underruns anyway.)

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In case that Brasero 2.30 uses libburn as backend:

I am quite sure that even the oldest libburn versions send
the "BUFE" bit to the drive with value 1, if the application
demanded it by the appropriate libburn call.

This can be tested separately by a run of xorriso.
It always enables burn-free.
E.g.
  xorriso -outdev /dev/sr0 -add ...some.directories.or.files... 

Unformatted DVD-RW should behave like DVD-R in this aspect.
But their lower speed makes buffer underruns less probable.

You can try to cause artificial buffer underruns by pausing
the text output of xorriso until it does not read more files
from disk.
(Pause output by Ctrl+S. Wait until disk stops blinking.
 Resume output by Ctrl+Q.)


Have a nice day :)

Thomas