[Harney Smile]

From Apple discussion forum, i find there solution to convert FLV to MOV just as below:

First one: HandBrake . This tool is a free and open-source multi-threaded transcoding app.

Cons:

1. HandBrake is too professional to handle for most people;
2. It doesn’t support MOV as output format.

Second one: there are many third party software which supports converting FLV to MOV.I highly recommend iDealshare VideoGo which can batch convert FLV to MOV much easier, faster, higher quality on Mac or Windows
Step by step guide at https://www.idealshare.net/video-converter/how-to-convert-flv-to-mov-on-mac-windows.html

Cons:

1. Most of them are not free.

Third one: Online-Converter . This kind of converter does a great job on file conversion.

Cons:

1. Like most online converters, the free version of this tool only allows you to convert videos smaller than 100MB. It’s too small for video conversion;
2.Your MKV video should be upload to the internet to be converted. This means the risk of pravite information leak is possible.