Matthias Kirschner mk@fsfe.org writes:
- Audio: Use ogg vorbis, or if you need a better quality flac.
Or, if you need specifically human speech, use Speex.
- Images: ...
Fortunately there aren't many problems using free software for the popular image formats. SVG for vector images, PNG for lossless raster images, and JPEG for lossy raster image compression. (The patents against JPEG can, in my not-a-lawyer opinion, be ignored as no more dangerous than any software idea patent.)