Q: I have a load of 1080p .M2TS video files that I'd like to convert to MKV to use with my portable device, but I can't find a way of converting them without loosing quality. If anyone knows what I'm doing wrong or knows any alternatives that would be appreciated, thanks.
A: To convert M2TS to MKV lossless on Mac, you need an easy-to-use and professional M2TS to MKV Converter. Leawo M2TS to MKV Converter for Mac is an easy-to-use M2TS to MKV Mac app. Follow the step by step guide, you will know how to operate it. Let's convert M2TS to MKV on Mac now!
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1. Add M2TS files
Click “Add” icon to add single or multiple video files into M2TS to MKV converter. You can preview video in view panel and take screenshots.
2.Video Editing
The application offers video editing functions. They are optional to use. Five alternatives: Trim, Crop, Rotation, Effect and watermark.
Modify the “Start Time” and “End time” of the converted video in Trim.
Choose “Letter Box” from “Zoom” and crop the video in “Cropped size”, or directly drag the dot frame to crop frame size.
Revolve the video to the needed angle in Rotation.
Simply drag the slides of “Brightness“, “Contrast“, “Saturation” and “Volume” to adjust the video effect for a better visual effect.
Add image or text watermark to the converted video file.
3.Output Setting
Click Profile to choose format for exported files. Optimized profiles for video conversion along with sufficient profiles for common media formats. Here we choose MKV as output format.
Upon selecting a profile, you can adjust more parameters for conversion output. You can adjust these parameters Video Codec, Bit Rate, Video Size, Frame Rate, Aspect Ratio, Sample Rate, etc.
4.Start converting M2TS to MKV
Click 
to start conversion process. You can set to shut down the computer automatically if you don’t want to wait around during conversion.
