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Make sure you run the latest version of FFmpeg. For Windows and Linux, static builds are availabe from the homepage. For OS X, you can install FFmpeg through Homebrew. Then, in the simplest case run: ffmpeg -i input.mkv -c:v libx264 -c:a libfaac out.mp4 For controlling video quality, set the crf parameter, which defaults to 23. Lower means better ...


The following works (sort of) with Audition 1.5... In "Edit View", select File/Open Append. From here you can select multiple files by control-clicking, and when you press Append, all will be concatenated. Cue points will indicate which part of the result came from which file. The trick is getting the sounds in the right order. I've found I have to ...


Audacity has an Export Multiple feature that does exactly that.


Assuming you have it in an MP4 container... the following should output an MP4 with six different audio streams, each one a mono rip of one of the audio channels: ffmpeg -i input.mp4 -vn -filter_complex channelsplit output.mp4 This more complicated ffmpeg command will split the AC3 file into several different files: ffmpeg -i input.mp4 -vn ...


You can do it with ffmpeg. Try a command line like this: ffmpeg -i <input_filename> -f <container> -vcodec copy -acodec libmp3lame -ar 44100 -ab 128k -ac 2 <output_filename> Replace the <> stuff with whatever filenames and containers you are using. Do note that this will downmix surround to 2 channel audio.


MKV is just a container. You can have an mpeg-4 video inside of a .mkv container. My suggestion is this: push the file to a .mkv container: mkvmerge -o newfile.mkv inputfile.m4v Get the script available here: https://github.com/JakeWharton/mkvdts2ac3 Run this: mkvdts2ac3.sh newfile.mkv Done! My TV supports AC3, but not DTS so this setup does wonders ...


Handbrake has a Mac OSX version. It might work for you.

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