how to convert only audio format

[diazz123]

hello how i can convert the audio format on a video file without change the video format i want to make ac3 to aac or mp3

because my tv player dont support ac3

[stanley]

Select "copy" on video tab.

[Kubernan]

Same concern. I am trying to change only the audio format by checking "Copy Video" in the Video tab.
During processing I can see the .ac3 file being created in by tmp folder. But at end of conversion, the new container file is not created.

Running: Version 0.8.52 b5920
Input: Contener Mkv, Video V_MPEG4/ISO/AVC, Audio E-AC-3
Trying to generate: Contener MP4Box, Video checked "Coypy Video", Audio AC-3