In article m2n-43F22A6F-20F9@bigred.inka.de you write:
km from the place I'm now, and I realize that it is a 100 MB file I should transfer by sftp every day. So I'd like to compress the file and convert it to MP3 directly on the linux box, in order to compress it
Use vdrsync to extract the audio track and lame to transcode it: vdrsync.pl -audio-only /path/to/recording/ lame --mp2input vdrsync0.mpa recording.mp3
Choose suitable lame options for encoding quality (e.g. --preset cd selects a bitrate of 192kbps which is just the same as the usual audio tracks on DVB-S; consequently this results in an MP3 file of almost exactly the same size as the MPA input).
Olaf