[Bug-ddrescue] Skipping over tar pits

[Ole Tange]

My current dead disk is quite interesting: It has a lot of "tar pits"
where the speed drops dramatically. Reading at 3000KB/s it hits a tar
pit, and after 30MB of 10KB/s it suddenly goes back to 3000KB/s and
stays there until the next tar pit a few 100MB later.

It is currently scraping, and it would be very useful if I could tell
ddrescue to skip the next 1MB if the read speed went below 1MB/s. It
might make sense to skip X bytes if speed drops below X bytes/s. I do
not want ddrescue to stop if the speed goes below the limit, but I
want it to skip forwards.

I have tried -a 1000000, but that does not seem to do this.

/Ole