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@ -19,7 +19,7 @@ are no buffer overruns/underruns and the audio stream is not interrupted. If the
audio stream is interrupted caused by one of the following problems: audio stream is interrupted caused by one of the following problems:
- The network jitter buffer is not large enough for the current network/audio interface jitter. - The network jitter buffer is not large enough for the current network/audio interface jitter.
- The sound card buffer delay (buffer size) is set to a too small value. - The sound card buffer delay (buffer size) is set to too small a value.
- The upload or download stream rate is too high for the current available internet bandwidth. - The upload or download stream rate is too high for the current available internet bandwidth.
- The CPU of the client or server is at 100%. - The CPU of the client or server is at 100%.
@ -51,7 +51,7 @@ the fader tag and the city entry shows up in the tool tip of the fader tag. This
### Connect/disconnect button ### Connect/disconnect button
Push this button to connect a server. A dialog where you can select a server will open. If you are connected, Push this button to connect to a server. A dialog where you can select a server will open. If you are connected,
pressing this button will end the session. pressing this button will end the session.
![Connect dialog](connect.jpg) ![Connect dialog](connect.jpg)
@ -65,7 +65,7 @@ Note that it may take some time to retrieve the server list from the central ser
address is specified in the settings, no server list will be available. address is specified in the settings, no server list will be available.
Alternatively, you can enter an IP address or URL of the server running the Jamulus server in the server address Alternatively, you can enter an IP address or URL of the server running the Jamulus server in the server address
field. An optional port number can be added after the IP address or URL using a comma as a separator, e.g, field. An optional port number can be added after the IP address or URL using a colon as a separator, e.g,
jamulus.dyndns.org:22124. A list of the most recent used server IP addresses or URLs is available for selection. jamulus.dyndns.org:22124. A list of the most recent used server IP addresses or URLs is available for selection.
### Reverberation effect ### Reverberation effect
@ -77,7 +77,7 @@ The mono channel selection and the reverberation level can be modified. If, e.g.
into the right audio channel of the sound card and a reverberation effect shall be applied, set the channel selector into the right audio channel of the sound card and a reverberation effect shall be applied, set the channel selector
to right and move the fader upwards until the desired reverberation level is reached. to right and move the fader upwards until the desired reverberation level is reached.
The reverberation effect requires significant CPU so that it should only be used on fast PCs. If the reverberation The reverberation effect requires significant CPU so it should only be used on fast PCs. If the reverberation
level fader is set to minimum (which is the default setting), the reverberation effect is switched off and does level fader is set to minimum (which is the default setting), the reverberation effect is switched off and does
not cause any additional CPU usage. not cause any additional CPU usage.
@ -120,7 +120,7 @@ system the input and output hardware can be selected.
![Channel mapping](channelmapping.png) ![Channel mapping](channelmapping.png)
In case the selected sound card device offers more than one input or output channel, the _Input Channel Mapping If selected sound card device offers more than one input or output channel, the _Input Channel Mapping
and Output Channel Mapping_ settings are visible. For each Jamulus input/output channel (left and right channel) and Output Channel Mapping_ settings are visible. For each Jamulus input/output channel (left and right channel)
a different actual sound card channel can be selected. a different actual sound card channel can be selected.
@ -128,7 +128,7 @@ a different actual sound card channel can be selected.
If enabled, the support for very small network audio packets is activated. Very small network packets are only If enabled, the support for very small network audio packets is activated. Very small network packets are only
actually used if the sound card buffer delay is smaller than 128 samples. The smaller the network buffers, the actually used if the sound card buffer delay is smaller than 128 samples. The smaller the network buffers, the
smaller the audio latency. But at the same time the network load increases and the probability of audio dropouts lower the audio latency. But at the same time the network load increases and the probability of audio dropouts
also increases. also increases.
### Buffer delay ### Buffer delay
@ -138,9 +138,9 @@ also increases.
The buffer delay setting is a fundamental setting of the Jamulus software. This setting has influence on many The buffer delay setting is a fundamental setting of the Jamulus software. This setting has influence on many
connection properties. Three buffer sizes are supported: connection properties. Three buffer sizes are supported:
- 128 samples: This is the preferred setting since it gives lowest latency but does not work with all sound cards. - 64 samples: This is the preferred setting since it gives lowest latency but does not work with all sound cards.
- 256 samples: This setting should work on most of the available sound cards. - 128 samples: This setting should work on most of the available sound cards.
- 512 samples: This setting should only be used if only a very slow computer or a slow internet connection is available. - 256 samples: This setting should only be used if only a very slow computer or a slow internet connection is available.
Some sound card drivers do not allow the buffer delay to be changed from within the Jamulus software. Some sound card drivers do not allow the buffer delay to be changed from within the Jamulus software.
In this case the buffer delay setting is disabled. To change the actual buffer delay, In this case the buffer delay setting is disabled. To change the actual buffer delay,
@ -152,7 +152,7 @@ the driver settings panel.
On Linux, use the Jack configuration tool to change the buffer size. On Linux, use the Jack configuration tool to change the buffer size.
The actual buffer delay has influence on the connection status, the current upload rate and the overall delay. The actual buffer delay has influence on the connection status, the current upload rate and the overall delay.
The lower the buffer size, the higher the probability of red light in the status indicator (drop outs) and the The lower the buffer size, the higher the probability of a red light in the status indicator (drop outs) and the
higher the upload rate and the lower the overall delay. higher the upload rate and the lower the overall delay.
![Buffer delay dependencies](bufferdelaydependency.jpg) ![Buffer delay dependencies](bufferdelaydependency.jpg)
@ -168,7 +168,7 @@ therefore influence on the quality of the audio stream (how many dropouts occur)
(the longer the buffer, the higher the delay). (the longer the buffer, the higher the delay).
The jitter buffer size can be manually chosen for the local client and the remote server. For the local jitter The jitter buffer size can be manually chosen for the local client and the remote server. For the local jitter
buffer, dropouts in the audio stream are indicated by the light on the bottom of the jitter buffer size faders. buffer, dropouts in the audio stream are indicated by the light below the jitter buffer size faders.
If the light turns to red, a buffer overrun/underrun took place and the audio stream is interrupted. If the light turns to red, a buffer overrun/underrun took place and the audio stream is interrupted.
The jitter buffer setting is therefore a trade-off between audio quality and overall delay. The jitter buffer setting is therefore a trade-off between audio quality and overall delay.
@ -182,9 +182,8 @@ timing jitter. If the Auto check is enabled, the jitter buffer size faders are d
![Audio channels](audiochannels.png) ![Audio channels](audiochannels.png)
Select the number of audio channels to be used for communication between client and server. There are three modes Select the number of audio channels to be used for communication between client and server. There are three modes
available. The mono and stereo modes use one and two audio channels respectively. In the mono-in/stereo-out mode available. The mono and stereo modes use one and two audio channels respectively. In mono-in/stereo-out mode
the audio signal which is sent to the server is mono but the return signal is stereo. This is useful for the case the audio signal which is sent to the server is mono but the return signal is stereo. This is useful if the sound card has the instrument on one input channel and the microphone on the other channel. In that case
that the sound card puts the instrument on one input channel and the microphone on the other channel. In that case
the two input signals can be mixed to one mono channel but the server mix can be heard in stereo. the two input signals can be mixed to one mono channel but the server mix can be heard in stereo.
Enabling the stereo streaming mode will increase the stream data rate. Make sure that the current upload rate does Enabling the stereo streaming mode will increase the stream data rate. Make sure that the current upload rate does
@ -233,7 +232,7 @@ central servers or a manual address can be specified.
![Indicators](indicators.png) ![Indicators](indicators.png)
The ping time is the time required for the audio stream to travel from the client to the server and backwards. The ping time is the time required for the audio stream to travel from the client to the server and back again.
This delay is introduced by the network. This delay should be as low as 20-30 ms. If this delay is higher (e.g., 50-60 ms), This delay is introduced by the network. This delay should be as low as 20-30 ms. If this delay is higher (e.g., 50-60 ms),
your distance to the server is too large or your internet connection is not sufficient. your distance to the server is too large or your internet connection is not sufficient.