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It can get more informations about these features at 'MKV2M4V Support'.
If the video track has wrong timestamps and is encoded with H.264/YUV420P/Progressive, it will attempt to repair it. For example, the video track with 'yuv420p10le' (yuv420p 10-bit) pixel formats or interlaced frames is not supported on the OS's default media feature. The copied video track may not be supported on the OS's default media feature according to the H.264 settings of the source video track. If the source video track is not H.264 codec, it may be not converted normally. ALAC option only works with M4V or MOV file format. It normalizes audio volume if it is not ‘Pass-through’. Pass-through option works only if the source audio codec is supported in the target's file format. It is available to add a second audio track encoded with AAC for the one source audio track. Depending on the supported audio codec of the media playback app, the converted file with only AC3 audio tracks may be not played normally. Two audio tracks in the one source file can be used for the conversion with the 'Custom' mode. It currently supports only the internal subtitle that is recognized as 'SSA', 'ASS (Advanced SubStation Alpha)’, ‘SUBRIP’ type. Supported text encodings are UTF-8, UTF-16. Source srt files should have a name like this ‘video_file_name’, ‘video_file_name*’. Source srt files should be in the same folder as the video file or in MKV2M4V’s the place to save.
If it has a SRT file, it is available to insert a closed caption to the converted file.It can use 'Mac' preset for the playback on 'iOS devices’/‘Apple TV' via the iTunes's 'Home Sharing'.Audio for 'Mac', 'iOS Device', 'Apple TV'.If it opens the folder that includes 'BDMV', it will automatically search 'm2ts' files in 'BDMV'.
Following formats can be opened: mkv, flv, mp4, m4v, mov, avi, ts, tp, trp, wmv, rmvb, mts, m2ts. And if the source video track's codec is supported in the m4v (mp4/mov) container, it can convert that.
Also, it can use MKV2M4V as a simple media info app. MKV, FLV files can be converted to M4V, MP4 or MOV. And if it has a SRT file, it is available to insert a closed caption. (it just copy a video track.) For the same reason, it can convert while preserving the original quality of the source video track.
It is very fast because “it converts only audio tracks” but does not convert a video track. This app can convert MKV files to M4V (MP4/MOV) files.