“I’d like to put a movie on iPhone 4, but to no avail. The movie is *.mkv file. What should I do with it? I heard that iPhone 4 plays HD video…” If you are facing the same problem, this article will definitely help. MKV (Matroska Video) is a container format including video,audio,image and subtitle tracks inside a single file, and it likes formats MOV and AVI to support video compression and codec. MKV video, especially MKV in HD, becomes more and more popular. And this guide is talking about converting 1080p HD MKV to iPhone 4 video so as to More >