How to Stream Local Video with Spring Boot, FFmpeg, and ZLMediaKit

1. Environment Preparation

Pull the ZLMediaKit Docker image and start the container:

# Pull image
docker pull zlmediakit/zlmediakit:master

# Run container
docker run -d \
  --name zlm-server \
  -p 1935:1935 \
  -p 8099:80 \
  -p 8554:554 \
  -p 10000:10000 \
  -p 10000:10000/udp \
  -p 8000:8000/udp \
  -v /docker-volumes/zlmediakit/conf/config.ini:/opt/media/conf/config.ini \
  zlmediakit/zlmediakit:master

Typical config.ini settings for HLS:

[hls]
 broadcastRecordTs=0
 deleteDelaySec=300    # keep video for 5 minutes
 fileBufSize=65536
 filePath=./www        # storage path
 segDur=2              # each .ts segment duration (seconds)
 segNum=1000           # max .ts segments in .m3u8
 segRetain=9999        # total retained segments on disk

Install FFmpeg from https://www.gyan.dev/ffmpeg/builds/ and add its bin directory to the system PATH so that ffmpeg is callable from the command line.

2. Spring Boot Backend Implementation

2.1 Add Dependency

<dependencies>
    <!-- Process management -->
    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-exec</artifactId>
        <version>1.3</version>
    </dependency>
</dependencies>

2.2 Stream Configuration Class

package com.lyk.plugflow.config;

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@Data
@Component
@ConfigurationProperties(prefix = "stream")
public class StreamConfig {
    /** ZLMediaKit service address */
    private String zlmHost;
    /** RTMP port */
    private Integer rtmpPort;
    /** HTTP‑FLV port */
    private Integer httpPort;
    /** Path to FFmpeg executable */
    private String ffmpegPath;
    /** Video storage directory */
    private String videoPath;
}

2.3 Stream Service Class

package com.lyk.plugflow.service;

import com.lyk.plugflow.config.StreamConfig;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.exec.*;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

@Slf4j
@Service
public class StreamService {
    @Autowired
    private StreamConfig streamConfig;

    // Store running stream processes
    private final Map<String, DefaultExecutor> streamProcesses = new ConcurrentHashMap<>();
    // Flag for manual stop
    private final Map<String, Boolean> manualStopFlags = new ConcurrentHashMap<>();

    /** Start streaming */
    public boolean startStream(String videoPath, String streamKey) {
        try {
            File videoFile = new File(videoPath);
            if (!videoFile.exists()) {
                log.error("Video file not found: {}", videoPath);
                return false;
            }
            String rtmpUrl = String.format("rtmp://%s:%d/live/%s",
                    streamConfig.getZlmHost(), streamConfig.getRtmpPort(), streamKey);
            CommandLine cmdLine = getCommandLine(videoPath, rtmpUrl);
            DefaultExecutor executor = new DefaultExecutor();
            executor.setExitValue(0);
            ExecuteWatchdog watchdog = new ExecuteWatchdog(ExecuteWatchdog.INFINITE_TIMEOUT);
            executor.setWatchdog(watchdog);
            ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
            executor.setStreamHandler(new PumpStreamHandler(outputStream));
            executor.execute(cmdLine, new ExecuteResultHandler() {
                @Override
                public void onProcessComplete(int exitValue) {
                    log.info("Stream finished, streamKey: {}, exitValue: {}", streamKey, exitValue);
                    streamProcesses.remove(streamKey);
                }
                @Override
                public void onProcessFailed(ExecuteException e) {
                    boolean isManualStop = manualStopFlags.remove(streamKey);
                    if (isManualStop) {
                        log.info("Stream manually stopped, streamKey: {}", streamKey);
                    } else {
                        log.error("Stream failed, streamKey: {}, error: {}", streamKey, e.getMessage());
                    }
                    streamProcesses.remove(streamKey);
                }
            });
            streamProcesses.put(streamKey, executor);
            log.info("Started streaming, streamKey: {}, rtmpUrl: {}", streamKey, rtmpUrl);
            return true;
        } catch (Exception e) {
            log.error("Failed to start stream", e);
            return false;
        }
    }

    private CommandLine getCommandLine(String videoPath, String rtmpUrl) {
        CommandLine cmdLine = new CommandLine(streamConfig.getFfmpegPath());
        cmdLine.addArgument("-re"); // read input at native frame rate
        cmdLine.addArgument("-i");
        cmdLine.addArgument(videoPath);
        cmdLine.addArgument("-c:v");
        cmdLine.addArgument("libx264"); // video codec
        cmdLine.addArgument("-c:a");
        cmdLine.addArgument("aac"); // audio codec
        cmdLine.addArgument("-f");
        cmdLine.addArgument("flv"); // output format
        cmdLine.addArgument("-flvflags");
        cmdLine.addArgument("no_duration_filesize");
        cmdLine.addArgument(rtmpUrl);
        return cmdLine;
    }

    /** Stop streaming */
    public boolean stopStream(String streamKey) {
        try {
            DefaultExecutor executor = streamProcesses.get(streamKey);
            if (executor != null) {
                manualStopFlags.put(streamKey, true);
                ExecuteWatchdog watchdog = executor.getWatchdog();
                if (watchdog != null) {
                    watchdog.destroyProcess();
                } else {
                    log.warn("Process has no watchdog, cannot force stop, streamKey: {}", streamKey);
                }
                streamProcesses.remove(streamKey);
                log.info("Stopped stream successfully, streamKey: {}", streamKey);
                return true;
            }
            return false;
        } catch (Exception e) {
            log.error("Failed to stop stream", e);
            return false;
        }
    }

    /** Get playback URL */
    public String getPlayUrl(String streamKey, String protocol) {
        return switch (protocol.toLowerCase()) {
            case "flv" -> String.format("http://%s:%d/live/%s.live.flv",
                    streamConfig.getZlmHost(), streamConfig.getHttpPort(), streamKey);
            case "hls" -> String.format("http://%s:%d/live/%s/hls.m3u8",
                    streamConfig.getZlmHost(), streamConfig.getHttpPort(), streamKey);
            default -> null;
        };
    }

    /** Check if a stream is active */
    public boolean isStreaming(String streamKey) {
        return streamProcesses.containsKey(streamKey);
    }
}

2.4 Application Configuration (application.yml)

stream:
  zlm-host: 192.168.159.129
  rtmp-port: 1935
  http-port: 8099
  ffmpeg-path: ffmpeg
  video-path: \videos\

spring:
  servlet:
    multipart:
      max-file-size: 1GB
      max-request-size: 1GB

3. Usage Instructions

3.1 Streaming Flow

Start the ZLMediaKit service (Docker container).

Upload a local video file to the server.

Call the Spring Boot streaming API with the video path and a stream key.

The service builds an FFmpeg command and pushes the stream to ZLMediaKit via RTMP.

3.2 Playback Flow

Obtain the playback URL (HTTP‑FLV or HLS) from getPlayUrl.

Use a front‑end player (e.g., flv.js) to play the live stream or recorded segments.

Example FFmpeg command generated by the service:

ffmpeg -re -i "C:\Users\lyk19\Videos\8月9日.mp4" -c:v libx264 -preset ultrafast -tune zerolatency -c:a aac -ar 44100 -b:a 128k -f flv rtmp://192.168.159.129:1935/live/stream

Simple HTML player using flv.js:

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>FLV Live Player</title>
  <style>
    .player-container { max-width:800px; margin:auto; background:white; padding:20px; border-radius:8px; box-shadow:0 2px 10px rgba(0,0,0,0.1); }
    video { width:100%; height:450px; background:#000; border-radius:4px; }
    .controls button { margin:5px; padding:10px 20px; border:none; border-radius:4px; background:#007bff; color:white; cursor:pointer; }
    .controls button:disabled { background:#ccc; cursor:not-allowed; }
    .status { margin-top:10px; padding:10px; border-radius:4px; text-align:center; }
    .status.success { background:#d4edda; color:#155724; }
    .status.error { background:#f8d7da; color:#721c24; }
    .status.info { background:#d1ecf1; color:#0c5460; }
  </style>
</head>
<body>
  <div class="player-container">
    <h1>FLV Live Player</h1>
    <video id="videoElement" controls muted>Your browser does not support video playback</video>
    <div class="controls">
      <button id="playBtn">Play</button>
      <button id="pauseBtn" disabled>Pause</button>
      <button id="stopBtn" disabled>Stop</button>
      <button id="muteBtn">Mute</button>
    </div>
    <div id="status" class="status info">Ready, click Play to start</div>
  </div>
  <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/flv.min.js"></script>
  <script>
    let flvPlayer = null;
    const videoEl = document.getElementById('videoElement');
    const playBtn = document.getElementById('playBtn');
    const pauseBtn = document.getElementById('pauseBtn');
    const stopBtn = document.getElementById('stopBtn');
    const muteBtn = document.getElementById('muteBtn');
    const statusDiv = document.getElementById('status');
    const streamUrl = 'http://192.168.159.129:8099/live/stream.live.flv';

    function updateStatus(msg, type) {
      statusDiv.textContent = msg;
      statusDiv.className = `status ${type}`;
    }
    function setButtons(play, pause, stop) {
      playBtn.disabled = !play;
      pauseBtn.disabled = !pause;
      stopBtn.disabled = !stop;
    }
    if (!flvjs.isSupported()) {
      updateStatus('Browser does not support FLV playback', 'error');
      playBtn.disabled = true;
    }
    playBtn.addEventListener('click', () => {
      if (flvPlayer) flvPlayer.destroy();
      flvPlayer = flvjs.createPlayer({type:'flv', url:streamUrl, isLive:true}, {
        enableWorker:false, lazyLoad:true, lazyLoadMaxDuration:180, deferLoadAfterSourceOpen:false,
        autoCleanupSourceBuffer:true, enableStashBuffer:false
      });
      flvPlayer.attachMediaElement(videoEl);
      flvPlayer.load();
      flvPlayer.on(flvjs.Events.ERROR, (type, detail, info) => {
        console.error('FLV error', type, detail, info);
        updateStatus(`Play error: ${detail}`, 'error');
      });
      flvPlayer.on(flvjs.Events.LOADING_COMPLETE, () => {
        updateStatus('Stream loaded', 'success');
      });
      videoEl.play().then(() => {
        updateStatus('Playing live stream', 'success');
        setButtons(false, true, true);
      }).catch(err => {
        console.error('Play failed', err);
        updateStatus('Play failed: ' + err.message, 'error');
      });
    });
    pauseBtn.addEventListener('click', () => {
      if (videoEl && !videoEl.paused) {
        videoEl.pause();
        updateStatus('Paused', 'info');
        setButtons(true, false, true);
      }
    });
    stopBtn.addEventListener('click', () => {
      if (flvPlayer) {
        flvPlayer.pause();
        flvPlayer.unload();
        flvPlayer.destroy();
        flvPlayer = null;
      }
      videoEl.src = '';
      videoEl.load();
      updateStatus('Stopped', 'info');
      setButtons(true, false, false);
    });
    muteBtn.addEventListener('click', () => {
      videoEl.muted = !videoEl.muted;
      muteBtn.textContent = videoEl.muted ? 'Unmute' : 'Mute';
      updateStatus(videoEl.muted ? 'Muted' : 'Unmuted', 'info');
    });
    videoEl.addEventListener('error', () => {
      updateStatus('Video playback error', 'error');
      setButtons(true, false, false);
    });
  </script>
</body>
</html>