The M4V file format is a video container format developed by Apple and is very similar to the MP4 format. The primary difference is that M4V files may optionally be protected by DRM copy protection. Apple uses M4V to encode video files in its iTunes Store. Unauthorized reproduction of M4V files may be prevented using Apple's FairPlay copy protection. A FairPlay-protected M4V file can only be played on a computer authorized (using iTunes) with the account that was used to purchase the video.
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FLV, a video file format of Flash Video. FLV was originally developed by Macromedia. In the early 2000s, Flash Video used to be the de facto standard for web-based streaming video (over RTMP). Flash Video FLV files usually contain material encoded with codecs following the Sorenson Spark or VP6 video compression formats. The most recent public releases of Flash Player (collaboration between Adobe Systems and MainConcept) also support H.264 video and HE-AAC audio.
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Step 1. Download and install the program, then double click it to run it, and then you'll see the main interface of the program.
Step 2. Click "Add File(s)" button. Here you can select "Add Video" or "Add Folder" button to add files as you like.
Step 3. Click the drop-down arrow right beside the "Profile" column and select your desired video format from the drop-down list.
Step 4. Click "Edit" button to customize the output video like Effect, Trim, Crop, 3D Settings and Watermark.