FFmpeg是什么？
是一套可以用来记录、转换数字音频、视频，并能将其转化为流的开源计算机程序。采用LGPL或GPL许可证。它提供了录制、转换以及流化音视频的完整解决方案。它包含了非常先进的音频/视频编解码库libavcodec，为了保证高可移植性和编解码质量，libavcodec里很多code都是从头开发的，
简单的理解，我项目中就是用他在做摄像头的处理，可以接任何一种监控摄像头
代码
public class FFmpegUtils {
private static final Logger LOGGER = LoggerFactory.getLogger(FFmpegUtils.class);
// 跨平台换行符
private static final String LINE_SEPARATOR = System.getProperty("line.separator");
/**
* 生成随机16个字节的AESKEY
* @return
*/
private static byte[] genAesKey () {
try {
KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
keyGenerator.init(128);
return keyGenerator.generateKey().getEncoded();
} catch (NoSuchAlgorithmException e) {
return null;
}
}
/**
* 在指定的目录下生成key_info, key文件，返回key_info文件
* @param folder
* @throws IOException
*/
private static Path genKeyInfo(String folder) throws IOException {
// AES 密钥
byte[] aesKey = genAesKey();
// AES 向量
String iv = Hex.encodeHexString(genAesKey());
// key 文件写入
Path keyFile = Paths.get(folder, "key");
Files.write(keyFile, aesKey, StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING);
// key_info 文件写入
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append("key").append(LINE_SEPARATOR); // m3u8加载key文件网络路径
stringBuilder.append(keyFile.toString()).append(LINE_SEPARATOR); // FFmeg加载key_info文件路径
stringBuilder.append(iv); // ASE 向量
Path keyInfo = Paths.get(folder, "key_info");
Files.write(keyInfo, stringBuilder.toString().getBytes(), StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING);
return keyInfo;
}
/**
* 指定的目录下生成 master index.m3u8 文件
* @param fileName master m3u8文件地址
* @param indexPath 访问子index.m3u8的路径
* @param bandWidth 流码率
* @throws IOException
*/
private static void genIndex(String file, String indexPath, String bandWidth) throws IOException {
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append("#EXTM3U").append(LINE_SEPARATOR);
stringBuilder.append("#EXT-X-STREAM-INF:BANDWIDTH=" + bandWidth).append(LINE_SEPARATOR); // 码率
stringBuilder.append(indexPath);
Files.write(Paths.get(file), stringBuilder.toString().getBytes(StandardCharsets.UTF_8), StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING);
}
/**
* 转码视频为m3u8
* @param source 源视频
* @param destFolder 目标文件夹
* @param config 配置信息
* @throws IOException
* @throws InterruptedException
*/
public static void transcodeToM3u8(String source, String destFolder, TranscodeConfig config) throws IOException, InterruptedException {
// 判断源视频是否存在
if (!Files.exists(Paths.get(source))) {
throw new IllegalArgumentException("文件不存在：" + source);
}
// 创建工作目录
Path workDir = Paths.get(destFolder, "ts");
Files.createDirectories(workDir);
// 在工作目录生成KeyInfo文件
Path keyInfo = genKeyInfo(workDir.toString());
// 构建命令
List<String> commands = new ArrayList<>();
commands.add("ffmpeg");
commands.add("-i") ;commands.add(source); // 源文件
commands.add("-c:v") ;commands.add("libx264"); // 视频编码为H264
commands.add("-c:a") ;commands.add("copy"); // 音频直接copy
commands.add("-hls_key_info_file") ;commands.add(keyInfo.toString()); // 指定密钥文件路径
commands.add("-hls_time") ;commands.add(config.getTsSeconds()); // ts切片大小
commands.add("-hls_playlist_type") ;commands.add("vod"); // 点播模式
commands.add("-hls_segment_filename") ;commands.add("%06d.ts"); // ts切片文件名称
if (StringUtils.hasText(config.getCutStart())) {
commands.add("-ss") ;commands.add(config.getCutStart()); // 开始时间
}
if (StringUtils.hasText(config.getCutEnd())) {
commands.add("-to") ;commands.add(config.getCutEnd()); // 结束时间
}
commands.add("index.m3u8"); // 生成m3u8文件
// 构建进程
Process process = new ProcessBuilder()
.command(commands)
.directory(workDir.toFile())
.start()
;
// 读取进程标准输出
new Thread(() -> {
try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()))) {
String line = null;
while ((line = bufferedReader.readLine()) != null) {
LOGGER.info(line);
}
} catch (IOException e) {
}
}).start();
// 读取进程异常输出
new Thread(() -> {
try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(process.getErrorStream()))) {
String line = null;
while ((line = bufferedReader.readLine()) != null) {
LOGGER.info(line);
}
} catch (IOException e) {
}
}).start();
// 阻塞直到任务结束
if (process.waitFor() != 0) {
throw new RuntimeException("视频切片异常");
}
// 切出封面
if (!screenShots(source, String.join(File.separator, destFolder, "poster.jpg"), config.getPoster())) {
throw new RuntimeException("封面截取异常");
}
// 获取视频信息
MediaInfo mediaInfo = getMediaInfo(source);
if (mediaInfo == null) {
throw new RuntimeException("获取媒体信息异常");
}
// 生成index.m3u8文件
genIndex(String.join(File.separator, destFolder, "index.m3u8"), "ts/index.m3u8", mediaInfo.getFormat().getBitRate());
// 删除keyInfo文件
Files.delete(keyInfo);
}
/**
* 获取视频文件的媒体信息
* @param source
* @return
* @throws IOException
* @throws InterruptedException
*/
public static MediaInfo getMediaInfo(String source) throws IOException, InterruptedException {
List<String> commands = new ArrayList<>();
commands.add("ffprobe");
commands.add("-i") ;commands.add(source);
commands.add("-show_format");
commands.add("-show_streams");
commands.add("-print_format") ;commands.add("json");
Process process = new ProcessBuilder(commands)
.start();
MediaInfo mediaInfo = null;
try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()))) {
mediaInfo = new Gson().fromJson(bufferedReader, MediaInfo.class);
} catch (IOException e) {
e.printStackTrace();
}
if (process.waitFor() != 0) {
return null;
}
return mediaInfo;
}
/**
* 截取视频的指定时间帧，生成图片文件
* @param source 源文件
* @param file 图片文件
* @param time 截图时间 HH:mm:ss.[SSS]
* @throws IOException
* @throws InterruptedException
*/
public static boolean screenShots(String source, String file, String time) throws IOException, InterruptedException {
List<String> commands = new ArrayList<>();
commands.add("ffmpeg");
commands.add("-i") ;commands.add(source);
commands.add("-ss") ;commands.add(time);
commands.add("-y");
commands.add("-q:v") ;commands.add("1");
commands.add("-frames:v") ;commands.add("1");
commands.add("-f"); ;commands.add("image2");
commands.add(file);
Process process = new ProcessBuilder(commands)
.start();
// 读取进程标准输出
new Thread(() -> {
try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()))) {
String line = null;
while ((line = bufferedReader.readLine()) != null) {
LOGGER.info(line);
}
} catch (IOException e) {
}
}).start();
// 读取进程异常输出
new Thread(() -> {
try (BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(process.getErrorStream()))) {
String line = null;
while ((line = bufferedReader.readLine()) != null) {
LOGGER.error(line);
}
} catch (IOException e) {
}
}).start();
return process.waitFor() == 0;
}}
其他
欢迎有问题及时交流~
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