I don't have a Blu-ray player in the house yet. Was a supporter of HD-DVD and I'm still bitter that Blu-ray won out. So my library right now is only DVD's. I won't toss the .mkv's ever after I'm done with the transcoding for aTV. I'm looking at getting a 4-drive NAS so storage won't be a problem.
The first thing I did was convert my 20 or so HD-DVD to apple tv format. Since it is a dead format, it makes since to go ahead and convert them to MKV or aTV.
The way I encoded them was I ran them thru makemkv, using a xbox 360 HD-DVD drive with my iMac. After that I ran them thru handbrake, using the Bluray settings earlier in this thread. The one caution is that HD-DVD subtitles are not compatible with handbrake (at least for hard burning.)
The only HD-DVD I owned that I needed subtitles (and thus was unable to convert) was Letters from Iwo Jima, which is only has Japanese audio, but with English subtitles. (I had to obtain a bluray copy and convert it instead.)
I had disc errors on Pulse, Carlito's Way 2: Rise to power, but those movies were awful anyway. Also, for some reason I was able to rip U-571 the first time, but I think the disc might have been bad, after a hard drive failure I was not able to rerip it.
At some point I need to dispose of my extra hd-dvd drive, unless I find more cheap movies in that format to trade/buy.
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I have soft subs working for our iPad 2. Something has changed with "the new" iPad?
Also, the regular build of HB will burn in subtitles, no need for the nightly build. Now if you want to burn in forced subtitles, you need the nightly build.
No need to put a fan on it. The processor automatically throttles back if the temperature gets too high. I know...it feels really hot, but the processors are made to run at high temps. Another reason to let it go overnight...so it's not sitting on your lap.
I actually haven't tried soft subtitles on the iPad, my info may be out of date. The reason I recommended the nightly build is that it will also convert Blu-ray subtitles, which the official release version will not currently.
If you only use DVD and don't convert bluray, it's not an issue, the nightly build is not needed.
I did have an experience on my older 2007 core 2 macbook, where in clamshell mode using handbrake to convert HD video (indycar video captures) it actually got so hot the computer would just turn off. It took me a while to figure out what was going on. That being said, it was very unusual situation, and simply running it open was enough to remedy the problem. I think a more modern macbook (metal vs plastic) would not have an issue.