Time Stamping

Picolo U4 H.264 PCI-104 embeds a local time clock. The local time clock is implemented with a counter that increments at a rate of 90 kHz.

Every video frame (consisting of a pair of fields) is time-stamped. The time stamp is the local time when the first sample of field 1 is delivered by the video decoder through the bus. The video time stamp period is typically 33 milliseconds for NTSC video signals, and 40 milliseconds for PAL video signals.

Every audio frame (consisting of 160 milliseconds of audio data) is time-stamped. The time stamp is actually the local time when the first audio sample is delivered by the audio interface through the bus.