Time lags which occur during playback of video and audio may have different causes. In some cases, the cause is hardware-related. For an audio-visual verification of synchronous playback, we provide our customers a test DCP incl. instructions.
It has to be distinguished between two basic video / audio types of time lag:
Offset between picture and sound is constant during playback:
- Offset of the image and / or sound track of the DCP is not entered correctly.
Solution: Regenerate DCP with corrected offsets
- Hardware is configured with incorrect latency.
Solution: Tho control of the graphics and sound card of a computer varies depending on hardware and operating system. Today's operating systems determine the respective delay and provide the value of this delay as "latency" to the affected programs.
These values are also available for easyDCP Publisher and easyDCP Player (+).
It's available for each audio device separate and can be subsequently adjusted within easyDCP programs here: Preference -> Audio -> Latency.
Offset between picture and sound changes / grows during playback:
- The source material does not match the frame rate provided in the DCP (e.g., 23.98 versus 24fps).
Solution: Regenerate DCP with corrected frame rate.
Note: If you're using easyDCP Creator/+ version 3.6 or higher, it is possible to convert frame rate data with 23,97 fps within 24 fps projects. Please have a look at the following MASTERCLASS FAQ how to adjust the frame rates: MASTERCLASS - Session Five: Automatically convert frame rates