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 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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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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The automatically calculated frame size for HD VGA sources is occasionally incorrect.
Workaround
: This problem is caused due to cable degradation or poor cable connection. Re-seat or exchange
your VGA cable. If the problem is still not resolved, visit the Epiphan Pearl support page for a custom EDID to
resolve the issue.
Affecting streaming and recording
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When switching layouts while streaming or recording it's possible to have a small number of frames
(approximately 100ms worth) repeated in the stream or recording file, and over the same time period a small
number of frames from the new layout skipped.
Workaround
: If dropped frames are problematic for your application, avoid the layout switching feature.
Affecting the web interface
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It is possible to name two or more channels with the same value. Use of automatic file transfer and UPnP is
unpredictable if this occurs.
Workaround
: Ensure each channel has a unique name.
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The automatic file upload (AFU) file queue shows a maximum of 15 files, Newer 15 and Top of the list buttons
do not work. All files are transfered, even though they are not listed.
Workaround
: Wait for the queue to have fewer files in the list.
