1. No signal images are not supported in 3.15.1 and 3.15.2. If they are present during the firmware
upgrade process, they are propagated forward, but there is no way to edit or modify the no signal
image through the channel layout editor. To delete the no signal image you must delete the layout and
recreate it.
2. The text overlay channel name shortcut (%c symbol) is not supported in 3.15.1 or 3.15.2. To work
around this issue, manually enter your channel's name in the text overlay box (in the channel layout
editor) instead of using the %c symbol.
Limitations and known issues
This section includes known issues or limitations that affect functionality or usability and ways that you can
work around these limitations.
Affecting encoding
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Limitation
: When Pearl is overloaded, video frames or audio samples can be dropped causing variable
frame rate and audio cracks.
Workaround
: Pearl is a powerful system capable of many simultaneous tasks, but like any other
computing device, it has finite resources. If this problem is observed, check the CPU load from your
system's Info page. To reduce system load, delete unused channels and unused layouts, or reduce the
complexity of layouts by scaling at the source instead of having the system scale, or reduce the number
of sources in layouts.
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Limitation
: When audio is enabled on an SDI source where video is already being captured, it takes up
to 15 seconds for the system to detect the audio. Once detected, the audio is properly synchronized
with the video.
Workaround
: Start the SDI signal with audio enabled, or check to ensure audio is detected before
streaming or recording.
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Auto sources (Auto-A and Auto-B) do not have an audio source in firmware release 3.15.2.
Workaround
: Add your desired audio source to your channel's layout using the layout editor on the
channel's Sources page.
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Encoding with MPEG-4 sometimes results in poor quality.
Workaround
: From the channel's stream setup, increase the video bitrate to improve picture quality.
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Video bitrate for MJPEG streams is larger than the configured value.
Workaround
: Verify the actual bitrate on the channel's channel status page when there are connected
viewers. If lower bitrates are important, select another codec.
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For VGA sources only, some wide-mode resolutions are not correctly identified and result in a slightly
squished image (e.g. for a 1360x768 source, the detected resolution may be 1024x768).
Workaround
: This issue is related to the video output hardware. Test your source to see if it exhibits
the issue. If possible, avoid using wide-mode for VGA displays that exhibit this issue.
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Some cameras are sensitive to EDIDs and are not captured at optimal settings. When capturing from
these cameras, the HD signal may be down-sampled by the camera to an SD signal because the
Epiphan system doesn't share the EDID the camera expects for its HD signal.
Workaround
: Contact Epiphan customer support for a custom EDID to resolve this issue.
