joining MTS files

jakeman3's picture
Last seen: 2 years 2 weeks ago
Joined: 11/10/2009 - 12:46am

I shoot long form events (an hour plus) on Canon consumer camcorders which generates MTS files. The length of the file depends on the compression

A one hour take will get split into 3 or 4 seperate files. When laid end to end on the timeline there is a glitch where they meet. Seems the problem is because of the 4 gig file limit of SD cards.This is not a new or isolated problem. Some day a geek of change that but in the meanwhile my question can I seamlessly merge / join these file so they play as one long, flawlessly merged file?

Mike Wilhelm's picture
Last seen: 3 hours 21 min ago
Joined: 01/16/2012 - 7:58pm
Administrator Plus Member

I've done it with MPEGStreamclip. I used to shoot with a camera that split video shots every two minutes! 


Just drag and drop the all the files together onto the screen and then export. It's free to download here:

Mike Wilhelm

Videomaker's Editor-in-Chief

Daniel Bruns's picture
Last seen: 1 year 2 months ago
Joined: 12/15/2009 - 7:46pm
Plus Member

Hey Jakeman,


Mike's right. In addition, you can also use the software that comes with any AVCHD camcorder to peice your files together. Also, QuickTime Pro also joins multiple video files (including MTS with the Perian plugin and the MPEG Component) into a .mov.


As you know, the files lose a few frames of video between each file due to the way MPEG recording works. MPEG Long GOP puts frames into a "Group of Pictures" usually of 12-15 frames each. If your recording medium stops writing a video file before the 12-15 frame group has been made, you could lose the frames it recorded before becoming a group or GOP. However, there is metadata associated with the clip that will instruct smart software how to join the two clips properly without losing any frames. The one Mike mentioned can do it, most software that comes with a camcorder can do it, and if you import your footage straight from the same folder structure it was written to in Adobe Premiere, you can keep these frames too. 


Hopefully that helps!



YNUS's picture
Last seen: 2 years 9 months ago
Joined: 07/30/2013 - 7:52am
Jakeman, try SolveigMM Video Splitter.
Editing frame accuracy within GOP.


Michael Robert Bonney's picture
Last seen: 2 years 4 months ago
Joined: 12/18/2013 - 1:00am

if you need to edit the video before converting, this MTS Video Converter is also a good helper which provides not only convert MTS to AVI, WMV, MKV, MP4, 3GP, 3G2, but also plentiful editing functions including cropping video dimension, trimming file length, adjust playing effects, etc.

Claude Massicotte's picture
Last seen: 2 months 1 day ago
Joined: 01/20/2011 - 2:05pm
Plus Member

I have used a file joiner (free) from Igorware

I do a lot of long shoots with files broken into 3 to 5 pieces.

File Joiner will take the files right from the camera and join them into a file that you can give a new name. (don't forget to include the MTS extension on the new file name)

This software has worked perfectly for my work for the past 2 years.


Hope that helps


rs170a's picture
Last seen: 6 days 14 hours ago
Joined: 03/07/2011 - 2:12pm

Most camcorders some with a utility that allows you to do exactly what you want to do. If you can't find it, check the Canon site for it.



mikey32230's picture
Last seen: 1 year 11 months ago
Joined: 06/05/2014 - 10:55am


You can try using Lehmann Video Tool (LVT).

I have developed a very simple easy user friendly program that will features the ability to merge AVCHD (.mts) files into a single (.m2ts) video file. 

The program also allows you to trim your video clips to the perfect sizes before merging them all if you wish.

You can try the program here or here

whitemax's picture
Last seen: 1 year 1 month ago
Joined: 12/15/2014 - 7:40pm

almsot all the video converter in the market can do such a job ,still you can try free mts/m2ts converter from pav, I found in App Store. But it only get the Mac verison. One thing I like it is it's free and almost all the formats can be converted to. 

chris198810's picture
Last seen: 6 months 1 week ago
Joined: 08/14/2013 - 8:01pm

When using camcorder to shoot videos, you will end up with some clips which are separated in multiple files rather than one big file. If you are tired of waiting for the switches when watching the clips, joining MTS files will be an ideal solution to this problem.


If you want to accomplish the task in an efficient way, you'd better seek help from a powerful and professional MTS video joiner like Brorsoft MTS Converter, which can also deinterlace 1080i MTS files.

lzbrown_15's picture
Last seen: 3 weeks 6 days ago
Joined: 07/22/2015 - 3:04am

Joining MTS videos seamlessly is quite easy indeed, all you need is some video joiner software programs that are compatible with MTS video format. Or if you don't want to install extra programs on your computer, utilizing some free online solutions is also a good choice. There are many online services can be used to do that. Here is a video introducing some free joining tools, both running on PC or Mac, along with a detailed tutorial teaching you how to do use them: