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Anybody recommend a GUI app (preferably in Ubuntu repos) to convert from .flv to .mp4 other than Transmageddon? Transmageddon now crashes in Trusty.

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Take a look at FFmpeg. – Mitch Aug 1 '14 at 8:02
I used VLC a lot to transcode. I think it uses some of the LI tools from the other answers as underlying engines. But it provides a GUI for the task. – Class Stacker Aug 1 '14 at 10:28

I don't think so there is GUI app is available in Ubuntu repository.

But you can simply convert your required formats in terminal. Try the following,

First you have to install libav-tools, Open terminal(Ctrl+Alt+T) and type the below command,

$ sudo apt-get install libav-tools

Now you can do your needs, for FLV file to MP4

$ avconv -i input.flv -codec copy output.mp4
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Have a look at winff

It is a graphical application that uses ffmpeg (like a lot of other programs) to convert videos and audio.

It is included in the official Ubuntu repositories, so you can simply install it with

sudo apt-get install winff

The official website includes a link to a wiki and a mailing list if you need specific support and documentation with this tool

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It's not in the Ubuntu repository, but I liked Format Junkie for video conversions:

Add repository:

sudo add-apt-repository ppa:noobslab/apps


sudo apt-get update

Install it:

sudo apt-get install formatjunkie


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Handbrake is in the official repositories since Trusty (14.04). It is a small, efficient DVD ripper and video transcoder with a clean GTK GUI.

It can convert from a number of video formats, including flv, to either MPEG-4 or Matroska.

To install:

$ sudo apt-get install handbrake
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I've been reading so many different forums on how to convert FLV to AVI. Finally, I summarized three solutions:

First one: HandBrake . This tool is a free and open-source multi-threaded transcoding app. It supports nearly any videos including WMV format and has Mac version and Windows version.


  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 MKV to AVI. I just test one of them. It's professional yet easy to use and the service is excellent. And there is a step by step guide about how to use this tool .


  1. Most of them are not free.

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


  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.
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I've written a GUI (named ConvertFLVToMP4)for CLI avconv program. Its .deb can be downloaded from: It requires the installation of gambas3 from: before installing the app from the .deb.

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