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[Bug-ddrescue] Bug Report

From: Robert Lopez
Subject: [Bug-ddrescue] Bug Report
Date: Tue, 11 Apr 2017 16:58:42 -0600


I’m reporting a bug with ddrescue version 1.22

I compiled it on macOS 10.12.5 last week.

Using two test DVDs I found that ddrescue is not creating DVD ISO images that 
are usable. The first disc I have has known errors in it (which is how I test 
to see if ddrescue is working properly), after processing this disc for three 
days, when ddrescue reports that its finished I then mount the ISO image but 
using any of my DVD player software (including the macOS DVD Player.app and Mac 
Blu-ray Player (by MacGO which has always been able to play the most 
recalcitrant discs), it will not play (just displays black.

I then ran ddrescue on a known good disc. ddrescue takes less than an hour to 
process this disc and it reports no errors at all. I mount the ISO image and it 
will not play using any DVD player software I have, so I installed VLC and it 
does play but it displays the “Extras” menu a the initial screen and you have 
to hunt for the Menu button to get it to actually start.

Postulating that there could be a problem with most of the players (which has 
never ever happened before) I burned the ISO image to disc (which verified just 
fine) and then when I tried to play the disc, the only software that could play 
it (with a few glitches) was VLC.

I had assumed that for forensic work that ddrescue would be ideal (based on 
what I read on The Net, but it seems that there is an odd problem with this 

Would you be kind enough to take a look at it, please?


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