CLOCK RECOVERY FOR VIDEO ENCODING/TRANSCODING APPLICATIONS

摘要

Approaches for clock synchronization in digital video environments. In an embodiment, an encoder/transcoder calculates a ratio between a system clock and a source clock. The source clock is used by a source device to encode or transcode digital video. The system clock is used by the encoder/transcoder. After the encoder/transcoder receives the digital video from the source device, the encoder/transcoder uses the calculated ratio to create a recovered clock. The recovered clock is locked to a frequency of the source clock but not to the phase of the source clock. The encoder/transcoder uses the recovered clock to encode or transfer the digital video received from the source device. The encoder/transcoder ensures that the frequency of the recovered clock does not change faster than a certain rate, e.g., 0.075 Hz/second.

主权项

1. A non-transitory computer-readable storage medium storing one or more sequences of instructions for synchronizing a system clock to a source clock, which when executed by one or more processors, cause:
an encoder/transcoder calculating a ratio between the system clock and the source clock, wherein the system clock is used by the encoder/transcoder; and the encoder/transcoder using the calculated ratio to create a recovered clock that is locked to a frequency of the source clock but not to the phase of the source clock; and the encoder/transcoder using said recovered clock to encode or transcode digital video received from a source that uses said source clock.