John Birch wrote: > Stef, > > There is no process relating PCR /PTS to real time (assuming by real > time you mean GMT or UTC etc) > PCR values wrap at an interval greater than 24 hours. > There is rarely any relationship between the PCR value and 'wall clock > time'. > > The PTS relates to the PCR - that is the PTS is the presentation time > stamp for the content it is embedded in (video, audio or subtitles). > When the PCR value in the stream matches the PTS, the content should be > presented (i.e. the video frame should be visible, audio heard, or > subtitle displayed). > ok. That makes things a lot clearer. What I'm trying to do is break the stream into small chunks, and save them mapped against 'wall clock time' - If the PTS and PCR don't carry a reliable form of 'wall clock time', should I just make sure the PC's clock is accurate and use that? I don't need subsecond accuracy, or even second accuracy. +/- a minute is probably ok. > Hope this helps... > > regards > > John Birch > Senior Software Engineer, > Screen Subtitling Systems > The Old Rectory, Church Lane > Claydon, Ipswich, Suffolk > IP6 OEQ > > www.screen.subtitling.com
