Video Production Stack Exchange is a question and answer site for engineers, producers, editors, and enthusiasts spanning the fields of video, and media creation. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I'd like to convert some AVCHD footage (.m2ts) to mp4 files. Can anybody here recommend a good converter (preferably free) that'll do a good job?

share|improve this question

FFmpeg should be able to do this - assuming you don't mind getting down with the command line (there may be some GUI options out there too possibly).

My Olympus E-P3 produces .MTS files - I assume they're similar (AVC/AC3 in a Blu-Ray Video wrapper).

I ran the following command: ffmpeg -i 00001.MTS -vcodec copy -acodec copy -f mp4 00001.mp4

That just tells FFmpeg to copy the video and audio streams but put them in a new mp4 format (the -f option). The resultant mp4 still has the same AVC/AC3 combination but now in a MP4 wrapper.

I played both source and output in VLC and they looked the same - obviously you should satisfy yourself that quality has been maintained.
I'll wager that most GUI tools to do this task use FFmpeg under the hood.

share|improve this answer

For Mac, there is a very simple and efficient solution that results in no loss of quality whatsoever, however it does require you to install some software.

  1. Install the clipgrap app. This contains the necessary codecs required for step 2. You don't have to use the app again, and I just left it in the 'Utilities' folder in 'Applications.'

  2. Download the 'Rewrap2M4V' file from this page. Put it on your desktop.

  3. Now drag and drop your M2TS file onto the Automator icon of the file you just downloaded. An MP4 file will be created in the directory of the M2TS file.

Basically, the automator script changes the wrapper on the file from the awkward Panasonic one to a more friendly MP4. You can now edit or do whatever you wish with it.

The advantage of this solution is that it does not hinder quality through conversion as many converters do. It does not affect the actual file content itself. It is also very quick.

share|improve this answer
Alistair - thanks for that. Unfortunately I'm on Windows - any comparable solution? – Galwegian Dec 15 '11 at 10:01

I believe Media Converter can do this using one of the Re-Wrap AVCHD for Quicktime presets. Not sure what format you want your audio in, but one of them is PCM uncompressed. I've just modified the preset to AAC for my own purposes though.

share|improve this answer

protected by AJ Henderson Jan 13 '15 at 2:57

Thank you for your interest in this question. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).

Would you like to answer one of these unanswered questions instead?

Not the answer you're looking for? Browse other questions tagged or ask your own question.