Hello, I'm using ffmpeg to record a live MPEG4 stream. This is working well. However, when I try to play back the stream - with say ffplay - I can't seek properly. The problem, I believe, is that the file is still open and so hasn't has whatever headers/trailers that are needed written to it yet. My question then is what output format should I be using? I'd like to be able to view the stream "live" but still seek backwards in time. A bit like a TiVo or similar. Andy -- Dr Andrew Parkins, M Eng (hons), AMIEE