delaycut can edit compressed audio (AC3 / EAC3 / DTS) without recoding, but it has the following limitations:
- It only allows adding silence / removing samples at the beginning or end of the file. You cannot add/remove samples in the middle of the file, and you cannot concatenate several files.
- It doesn’t display a graphical representation of the sound being edited. If you need to visualize what you edit, you have to use a separate sound editor.
delaycut is essentially command-line but it comes with a rudimentary GUI that allows you to pick the file graphically and display units next to the numbers you put in (seconds/milliseconds/packets/etc.)