How to convert .mkv movies aac or mp4a soundtrack to mp3 ?

[winter snake]

May be it is very simple but I am confused. How can I change mkv movies audio files (mp4a, aac, etc.) to mp3, wma, or AC3 without touching video rapidly, What is the fastest and easiest way ?

[poisondeathray]

avidemux

video=>copy
audio=>mp3,aac, ac3 etc... (select options, bitrate, etc..)
format=>mkv

press save with extension (e.g. "myvideo.mkv")

[winter snake]

Thanks for reply but the software gave this error (I gave it below) message and after saving video can't seen any video only audio stays. Is there any other method or another software that can do this troubleless ?

[poisondeathray]

troubleless: mkvextract to extract audio, then convert using any audio program eg. eac3to, foobar2k, audacity, then remux with mkvtoolnix on original file, uncheckmark old audio, add new audio

[winter snake]

Thanks, it really works well.

[Baldrick]

Or ffmpeg or a frontend for it like Xmedia recode, open mkv, under format choose matroska video, under video tab choose video copy, under audio tab choose mp3. Add job. Convert.

[hibbs]

Post removed

[X__Alien]

Thank you. I need the same, since my home cinema doesn't read AAC.

In Avidemux, in output format i choose "mkv muxer", but i have no idea if the other formats are good. What should i choose?

[poisondeathray]

Thank you. I need the same, since my home cinema doesn't read AAC.

In Avidemux, in output format i choose "mkv muxer", but i have no idea if the other formats are good. What should i choose?

Use whatever format your "home cinema" supports . Have a look at the manual for the supported formats

[manono]

I use MKV2AC3 for this sort of thing.

[X__Alien]

Thank you. I need the same, since my home cinema doesn't read AAC.

In Avidemux, in output format i choose "mkv muxer", but i have no idea if the other formats are good. What should i choose?

Use whatever format your "home cinema" supports . Have a look at the manual for the supported formats

What about the audio? I have AC3 lav and aften. What's the difference?

[poisondeathray]

What about the audio? I have AC3 lav and aften. What's the difference?

For AC3, LAV encoding is slightly better, has newer updates.

[X__Alien]

What about the audio? I have AC3 lav and aften. What's the difference?

For AC3, LAV encoding is slightly better, has newer updates.

Thank you!

Now i have this message when i select mkv muxer: "the video has been saved but seems to be incomplete"
It works fine if i choose AVI Muxer

[DarrellS]

Just put files that you want to convert in a folder with a copy of ffmpeg (make sure there are no spaces in the filenames) and create a .bat file (use notepad and save as .bat) and double click the .bat file and it will convert all the files in the folder.

for mp3 audio use...

for %%a in ("*.mkv") do ffmpeg -i %%a -vcodec copy -acodec libmp3lame -sameq %%~na.new.mkv

for ac3 use...

for %%a in ("*.mkv") do ffmpeg -i %%a -vcodec copy -acodec ac3 -sameq %%~na.new.mkv

If you want to do a single file, the above bat file will still work if you put that file in your folder or you could use...

ffmpeg -i yourinputfile.mkv -vcodec copy -acodec libmp3lame -sameq youroutputfile.mkv
ffmpeg -i yourinputfile.mkv -vcodec copy -acodec ac3 -sameq youroutputfile.mkv

yourinputfile = X:\yourfolder\yourfile.mkv
youroutputfile = X:\yourfolder\yourfile.mkv

If you save to the same folder, change the output file name. It's easier for me just to use the first option so that you don't have to keep making new bat files for each file that you want to convert.

You can use ffmpeg to do a lot of different conversions. If you just want to change containers then you would just use the copy command...

-vcodec copy -acodec copy

Example:

To put AVC/AAC.FLV into an MP4 container...

for %%a in ("*.flv") do ffmpeg -i %%a -vcodec copy -acodec copy %%~na.mp4

To fix FLV with Nellymoser or Speex audio...

for %%a in ("*.flv") do ffmpeg -i %%a -vcodec copy -acodec libmp3lame -sameq %%~na.new.flv

[X__Alien]

Well, thanks!

[ozok]

Sorry i thought you wanted to extract audio.

You can use TEncoder for that. Set video codec to "Direct copy".

[X__Alien]

Yeah, Ozok, i just want to change the audio type, so i can play movies in my home cinema (who doesn't work with AAC)

I am currently using Avidemux, that sometimes works, other times dont. Usually, when the file is mp4, it appears an error message saying "the video has been saved but seems to be incomplete"

I have to convert from mkv to avi but sometimes this makes the movie have little "jumps" while playing. It's not fluid (it's hard to explain what happens).

Im gonna try that TEncoder you're talking.
Thanks!