Symptoms can include black video recorded or
at playout, frozen video, slow performance, or inconsistent media access. These
symptoms can be accompanied by StatusPane messages regarding disk problems or
overrun/underrun conditions for encoders, decoders, or timecode.
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The following causes can occur on their own or
in combination to produce the problem:
- Disk
oversubscription — This occurs when requests to the media disk exceed the
disk’s bandwidth capabilities. This generally occur in extreme cases when a
combination of high-bandwidth operations are taking place, such as jog/shuttle,
record/play on multiple channels, or streaming multiple clips.
- High CPU
activity in Windows — This occurs when activities on the Windows operating
system over-tax the capabilities of the CPU. This commonly happens when
unsupported software has been installed that competes with
K2 Summit system applications. Virus
scanners and screen savers can cause this type of problem, since they can start
automatically and consume system resources.
- Encoder overrun
— This occurs when an encoder is flooded with more data than it can process
within its real-time requirements for recording.
- Decoder underrun
— This occurs when a decoder is starved for data and cannot deliver enough to
satisfy real-time requirements for playout.
- Disk faults —
This occurs when a media disk is severely fragmented or has a bad blocks that
interfere with some, but not all, media operations. For example, a particular
clip can be written on a bad block, so the problem occurs only on that clip.
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Try to re-create the problem. Identify all the
interactions that affected the system and run all the same operations as when
the error occurred. Record/play/stream the same clips. Investigate the
functions that seem to push the system into the error state. If you determine
that certain simultaneous operations cause the problem, re-order your workflow
to avoid those situations. If you determine that the problem is only on certain
clips, investigate disk faults.
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