You have an MP3 file and want it converted into an OGG file:
```
ffmpeg -i input.mp3 output.ogg
```
This also works with videos:
```
ffmpeg -i input.mp4 output.webm
```
The file you have is partially correct with only a single stream in the wrong format. It can be very time consuming to re-encode the correct stream. FFmpeg can help with this situation:
```
ffmpeg -i input.webm -c:v copy -c:a flac output.mkv
```
