[patch] add CLI warning: subtitle_scan/start-at incompat.

[rzm2357]

Quick patch to display a warning message when attempting to do a subtitle_scan for forced/foreign language on a portion of a file.

http://paste.handbrake.fr/pastebin.php?show=2853

I was trying to test out forced subtitle rendering and tried

Code: Select all

HandBrakeCLI -i RONIN69 -t 1 --start-at duration:260 --stop-at duration:360 -s scan -F 1 --subtitle-burn 1 -o fails.mkv

which silently failed. I did find out that selecting by chapter worked, but I thought this might patch might prevent some frustration for another naive user like me.