What the program does is extract the h.264 encoded video and audio and then places it in the m4v container (please note that this is generally only the case of 720p versions as the SD versions are usually encoded with XviD for video MPEG for audio which will result in the program encoding it like HandBreak or Quicktime with Perian installed). Re-encoding takes time which you do not need to spend because the only difference between most mkv’s and m4v’s is container format that is used. Re-encoding on the other hand takes your mkv file and transforms the data into the proper format for iTunes. Well, it’s quite simple actually converting entails extracting the already present h.264 video (which iTunes likes), and whatever audio is present in the file and then just placing them in a different container format, in this case m4v. You may ask what the difference is between conversion and re-encoding. Not wasting time in the sense of converting them to the m4v file that iTunes needs but wasting time because you don’t need to re-encode the files to work with iTunes. Now you might think I’ll just use HandBreak or Quicktime with Perian installed, but what you may not realise is that in using these programs you are wasting time. This is a problem if your primary reason for importing the video into iTunes is to be able to transfer it to your various “i” devices or if you just want to leverage the organisation of the iTunes library. If you have ever tried to import downloaded video files intro iTunes you would have discovered that most files will not work.
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