FFmpeg流媒体（4）

FFmpeg录制和发布UDP/TCP流

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1、TCP与UDP参数说明

ffmpeg --help full

tcp AVOptions:
  -listen            <int>        ED....... Listen for incoming connections (from 0 to 2) (default 0)
  -timeout           <int>        ED....... set timeout (in microseconds) of socket I/O operations (from -1 to INT_MAX) (default -1)
  -listen_timeout    <int>        ED....... Connection awaiting timeout (in milliseconds) (from -1 to INT_MAX) (default -1)
  -send_buffer_size  <int>        ED....... Socket send buffer size (in bytes) (from -1 to INT_MAX) (default -1)
  -recv_buffer_size  <int>        ED....... Socket receive buffer size (in bytes) (from -1 to INT_MAX) (default -1)
  -tcp_nodelay       <boolean>    ED....... Use TCP_NODELAY to disable nagle's algorithm (default false)
  -tcp_mss           <int>        ED....... Maximum segment size for outgoing TCP packets (from -1 to INT_MAX) (default -1)

udp AVOptions:
  -buffer_size       <int>        ED....... System data size (in bytes) (from -1 to INT_MAX) (default -1)
  -bitrate           <int64>      E........ Bits to send per second (from 0 to I64_MAX) (default 0)
  -burst_bits        <int64>      E........ Max length of bursts in bits (when using bitrate) (from 0 to I64_MAX) (default 0)
  -localport         <int>        ED....... Local port (from -1 to INT_MAX) (default -1)
  -local_port        <int>        ED....... Local port (from -1 to INT_MAX) (default -1)
  -localaddr         <string>     ED....... Local address
  -udplite_coverage  <int>        ED....... choose UDPLite head size which should be validated by checksum (from 0 to INT_MAX) (default 0)
  -pkt_size          <int>        ED....... Maximum UDP packet size (from -1 to INT_MAX) (default 1472)
  -reuse             <boolean>    ED....... explicitly allow reusing UDP sockets (default auto)
  -reuse_socket      <boolean>    ED....... explicitly allow reusing UDP sockets (default auto)
  -broadcast         <boolean>    E........ explicitly allow or disallow broadcast destination (default false)
  -ttl               <int>        E........ Time to live (multicast only) (from 0 to INT_MAX) (default 16)
  -connect           <boolean>    ED....... set if connect() should be called on socket (default false)
  -fifo_size         <int>        .D....... set the UDP receiving circular buffer size, expressed as a number of packets with size of 188 bytes (from 0 to INT_MAX) (default 28672)
  -overrun_nonfatal  <boolean>    .D....... survive in case of UDP receiving circular buffer overrun (default false)
  -timeout           <int>        .D....... set raise error timeout (only in read mode) (from 0 to INT_MAX) (default 0)
  -sources           <string>     ED....... Source list
  -block             <string>     ED....... Block list

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2、TCP监听接收流

ffmpeg -listen 1 -f flv -i tcp://127.0.0.1:1234/live/stream -c copy -f flv output.flv

执行完命令后，FFmpeg会进入端口监听模式，等待客户端连接到本地的1234端口。

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3、TCP请求发布流

ffmpeg -re -i input.mp4 -c copy -f flv tcp://127.0.0.1:1234/live/stream

如上，请求端口1234，指定输出格式为FLV格式。

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4、监听端口超时listen_timeout

time ./ffmpeg -listen_timeout 5000 -listen 1 -f flv -i tcp://127.0.0.1:1234/live/stream -c copy -f flv output.flv

设置5秒钟超时时间，超时则退出监听。

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5、TCP拉流超时参数timeout

time ./ffmpeg -timeout 20000000 -i tcp://192.168.100.179:1935/live/stream -c copy -f flv output.flv

设置超时时间为20秒，连接TCP拉取端口1935的数据。

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6、TCP传输buffer大小设置send_buffer_size/recv_buffer_size

ffmpeg -re -i input.mp4 -c copy -send_buffer_size 265 -f flv tcp://192.168.100.179:1234/live/stream

执行该命令，因为发送的buffer大小变成了265，数据发送的频率变大，并且次数变多，网络开销也大，因此输出速度会变慢。

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7、绑定本地UDP端口localport

ffmpeg -re -i input.mp4 -c copy localport 23456 -f flv udp://192.168.100.179:1234/live/stream

如上，使用localport参数设置监听本地端口。

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