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< h1 > UDP file options< a class = "headerlink" href = "#udp-file-options" title = "Permalink to this headline" > ¶< / a > < / h1 >
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< p > UDP file is of the form:< / p >
< div class = "highlight-default" > < div class = "highlight" > < pre > < span > < / span > udp://< ip> :< port> [?< option> [& < option> ]...]
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< p > Here is the list of supported options:< / p >
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< tr class = "field-odd field" > < th class = "field-name" colspan = "2" > buffer_size=< size_in_bytes> :< / th > < / tr >
< tr class = "field-odd field" > < td >   < / td > < td class = "field-body" > UDP maximum receive buffer size in bytes. Note that although it can be set
to any value, the actual value is capped by maximum allowed size defined by
the underlying operating system. On linux, the maximum size allowed can be
retrieved using < cite > sysctl net.core.rmem_max< / cite > and configured using
< cite > sysctl -w net.core.rmem_max=< size_in_bytes> < / cite > .< / td >
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< / tr >
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< tr class = "field-even field" > < th class = "field-name" colspan = "2" > interface=< addr> :< / th > < / tr >
< tr class = "field-even field" > < td >   < / td > < td class = "field-body" > Multicast group interface address. Only the packets sent to this address are
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received. Default to “0.0.0.0” if not specified.< / td >
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< / tr >
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< tr class = "field-odd field" > < th class = "field-name" > reuse=0|1:< / th > < td class = "field-body" > Allow or disallow reusing UDP sockets.< / td >
< / tr >
< tr class = "field-even field" > < th class = "field-name" > source=< addr> :< / th > < td class = "field-body" > Multicast source ip address. Only the packets sent from this source address
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are received. Enables Source Specific Multicast (SSM) if set.< / td >
< / tr >
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< tr class = "field-odd field" > < th class = "field-name" colspan = "2" > timeout=< microseconds> :< / th > < / tr >
< tr class = "field-odd field" > < td >   < / td > < td class = "field-body" > UDP timeout in microseconds.< / td >
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< p > Example:< / p >
< div class = "highlight-default" > < div class = "highlight" > < pre > < span > < / span > udp://224.1.2.30:88?interface=10.11.12.13& reuse=1
< / pre > < / div >
< / div >
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< div class = "admonition note" >
< p class = "first admonition-title" > Note< / p >
< p > UDP is by definition unreliable. There could be packets dropped.< / p >
< p > UDP packets do not get lost magically. There are things you can do to
minimize the packet loss. A common cause of packet loss is buffer overrun,
either in send buffer or receive buffer.< / p >
< p > On Linux, you can check UDP errors by monitoring the output from
< cite > netstat -suna< / cite > command.< / p >
< p > If there is an increase in < cite > send buffer errors< / cite > from the < cite > netstat< / cite > output,
then try increasing < cite > buffer_size< / cite > in
[FFmpeg](< a class = "reference external" href = "https://ffmpeg.org/ffmpeg-protocols.html#udp" > https://ffmpeg.org/ffmpeg-protocols.html#udp< / a > ).< / p >
< p class = "last" > If there is an increase in < cite > receive buffer errors< / cite > , then try increasing
< cite > buffer_size< / cite > in UDP options (See above) or increasing < cite > – < / cite > .
< cite > buffer_size< / cite > in UDP options defines the UDP buffer size of the underlying
system while < cite > io_cache_size< / cite > defines the size of the internal circular
buffer managed by < cite > Shaka Packager< / cite > .< / p >
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