Following is the java method which you can use to read data from rtmp url with the integration of FFMPEG library.
public static void liveRtmpFeed() throws IOException, InterruptedException {
ProcessBuilder processBuilder = new ProcessBuilder("ffmpeg", "-i",
"rtmp://192.168.0.90/oflaDemo/livestream", "-ss", "00:00:00",
"-t", "00:00:10", "-c", "copy", "/home/outputVideo.mp4");
Process process = processBuilder.start();
InputStream stderr = process.getErrorStream();
InputStreamReader isr = new InputStreamReader(stderr);
BufferedReader br = new BufferedReader(isr);
while ((br.readLine()) != null)
;
process.waitFor();
try {
process.destroy();
isr.close();
stderr.close();
} catch (Exception e) {
e.printStackTrace();
}
}