If you see this error message during file conversion:
Error: Output file #0 does not contain any stream
This issue is not caused by our converter. It comes from problems with your source file.
For example: If you try converting an MP4 video to MP3, but the original MP4 file has no audio track. In this case, it cannot be exported as an MP3 audio file. Please check in advance whether your source file contains the content required by your target format.
Likewise, converting an MP3 file to MP4 will also fail. MP3 files only store audio and contain no video frames, so they cannot be turned into a valid MP4 video file.