epiphan Pearl-2 Rackmount, User Manual

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Pearl-2 User Guide Codecs and file format compatibility
Value Description
may result in distorted audio.
MP3
MP3 provides a common audio format for audio storage. Supported sampling
bitrate values are: 22 kHz, 44 kHz and 48 kHz.
Setting the channel bitrate to match the audio source's bitrate provides the best
sound quality and avoids audio resampling. Most digital signals (HDMI
or SDI sources) use 48 kHz. For analog signals, 44 kHz provides a good quality
audio sample.
Web browsers that use Flash (FLV) do not support 48 kHz MP3 audio.
When selecting this encoding, you must use a web browser that
supports HTML5 or a media player to preview your channel.
PCM
Pulse Code Modulation (PCM) is a standard for digital audio in computer and other
devices such as, digital telephone systems.
Setting the level to match the audio source's level provides the best sound quality
and avoids audio resampling. Most digital signals (HDMI or SDI sources) use 48 kHz
audio. For analog signals, 44 kHz provides a good quality audio sample.
The Flash (FLV) plugin must be installed for your web browser to play
back audio that's encoded as PCM. Web browsers that use Flash (FLV)
do not support 48 kHz PCM audio.
Format compatibility
Not all streaming and recording protocols support all combinations of video and audio codecs. The following
table displays the compatibility between the video/audio codecs and the supported streaming formats.
Table 42 Video/audio codecs and formats for streaming
Video Codec selected Audio Codec selected RTSP FLV MPEG-TS MJPEG
H.264 No audio codec
ü ü ü
H.264 PCM
ü ü
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