Errors of +20 ms (audio advanced) and -40 ms (audio delayed) are "detectable", and errors of +40 and -160 ms are "subjectively annoying"*.
A single video frame is displayed for 40ms (PAL) or 41.7ms (NTSC). A single-frame audio delay may be acceptable, but a single frame in advance is clearly not (this is because this is an unnatural condition - we are accustomed to a minor audio lag in everyday life due to the differences between the speeds of light and sound).
* Ref: International Telecommunication Union Document 11A/47-E, 13 October 1993
Post #463268
- Author
- Moth3r
- Parent topic
- Star Wars 1977 70mm sound mix recreation [stereo and 5.1 versions now available] (Released)
- Link to post in topic
- https://originaltrilogy.com/post/id/463268/action/topic#463268
- Date created
- 13-Jan-2011, 7:29 AM