[Java] Application provided invalid, non monotonically increasing dts to muxer in stream 0

我的需求是验证Java能否实现将已有的RTSP流A转为RTSP流B。

可以的，需要引入这个版本的javacv（老板会报直接错，用这个版本能播放个10来秒才报错，不过我解决标题这个问题后就没问题了）

这个错误的意思是当前包的编译时间戳（DTS）比上一次的DTS小，然后ffmpeg不允许这种情况，所以就报错了。

解决办法就是当出现这种情况时，让当前包的dts 赋值为上一次dts+1，保证比上一次dts大就行了。

<dependency><groupId>org.bytedeco</groupId><artifactId>javacv-platform</artifactId><version>1.5.9</version></dependency>

关键代码为：

if (packet.pts() == AV_NOPTS_VALUE) {if (packet.dts() != AV_NOPTS_VALUE) {packet.pts(packet.dts());lastDTS = packet.dts();} else {packet.pts(lastDTS + 1);packet.dts(packet.pts());lastDTS = packet.pts();}} else {if (packet.dts() != AV_NOPTS_VALUE) {if (packet.dts() < lastDTS) {packet.dts(lastDTS + 1);}lastDTS = packet.dts();} else {packet.dts(packet.pts());lastDTS = packet.dts();}}

完整的代码为：

package org.jfjy.ecctv.core.jtr;import org.bytedeco.ffmpeg.avcodec.AVPacket;
import org.bytedeco.ffmpeg.avformat.AVFormatContext;
import org.bytedeco.ffmpeg.global.avcodec;
import org.bytedeco.ffmpeg.global.avformat;
import org.bytedeco.ffmpeg.global.avutil;
import org.bytedeco.javacv.*;import java.text.SimpleDateFormat;import static org.bytedeco.ffmpeg.global.avutil.AV_NOPTS_VALUE;/*** RTSP转RTMP** @author zhout*/
public class RTSPToRTMPWithAVPacket {private static final int RECORD_LENGTH = 5000;private static final boolean AUDIO_ENABLED = false;public static void main(String[] args) throws FrameRecorder.Exception, FrameGrabber.Exception {avutil.av_log_set_level(avutil.AV_LOG_DEBUG);FFmpegLogCallback.set();String inputFile = "rtsp://127.0.0.1:8554/live";//String inputFile = "D:\\cData\\rtsp\\orange.mp4";/*        // Decodes-encodesString outputFile = "/tmp/" + DATE_FORMAT.format(new Date()) + "_frameRecord.mp4";RTSPToRTMPWithAVPacket.frameRecord(inputFile, outputFile);*/// copies codec (no need to re-encode)//String outputFile = "/tmp/" + DATE_FORMAT.format(new Date()) + "_packetRecord.mp4";String outputFile = "rtsp://127.0.0.1:8554/live2";RTSPToRTMPWithAVPacket.packetRecord(inputFile, outputFile);}public static void frameRecord(String inputFile, String outputFile) throws FrameGrabber.Exception, FrameRecorder.Exception {int audioChannel = AUDIO_ENABLED ? 1 : 0;FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(inputFile);FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(outputFile, 1280, 720, audioChannel);grabber.start();recorder.start();Frame frame;long t1 = System.currentTimeMillis();while ((frame = grabber.grabFrame(AUDIO_ENABLED, true, true, false)) != null) {recorder.record(frame);if ((System.currentTimeMillis() - t1) > RECORD_LENGTH) {break;}}recorder.stop();grabber.stop();}public static void packetRecord(String inputFile, String outputFile) throws FrameGrabber.Exception, FrameRecorder.Exception {int audioChannel = AUDIO_ENABLED ? 1 : 0;FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(inputFile);FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(outputFile, 600, 400, audioChannel);grabber.start();recorder.setInterleaved(true);recorder.setVideoOption("tune", "zerolatency");recorder.setVideoOption("preset", "ultrafast");recorder.setVideoCodec(avcodec.AV_CODEC_ID_H264);recorder.setFormat("rtsp");System.out.println("grabber.getFrameRate():" + grabber.getFrameRate());recorder.setFrameRate(grabber.getFrameRate());recorder.setGopSize((int) grabber.getFrameRate() * 2);AVFormatContext formatContext = grabber.getFormatContext();formatContext.max_interleave_delta(0);formatContext.flags(avformat.AVFMT_TS_NONSTRICT);recorder.setTimestamp(0);recorder.start(formatContext);AVPacket packet;long startTime = System.currentTimeMillis();long videoTS = 0;long lastDTS = 0;while ((packet = grabber.grabPacket()) != null) {if (packet.pts() == AV_NOPTS_VALUE) {if (packet.dts() != AV_NOPTS_VALUE) {packet.pts(packet.dts());lastDTS = packet.dts();} else {packet.pts(lastDTS + 1);packet.dts(packet.pts());lastDTS = packet.pts();}} else {if (packet.dts() != AV_NOPTS_VALUE) {if (packet.dts() < lastDTS) {packet.dts(lastDTS + 1);}lastDTS = packet.dts();} else {packet.dts(packet.pts());lastDTS = packet.dts();}}if (packet.pts() < packet.dts()) {packet.pts(packet.dts());}videoTS = 1000 * (System.currentTimeMillis() - startTime);if (videoTS < 0 || packet.dts() < 0 || packet.pts() < 0) {continue;}// Check for AV driftSystem.out.println("videots:%d; recorder timestamp:%d".formatted(videoTS, recorder.getTimestamp()));if (videoTS > recorder.getTimestamp()) {System.out.println("Lip-flap correction: "+ videoTS + " : "+ recorder.getTimestamp() + " -> "+ (videoTS - recorder.getTimestamp()));// We tell the recorder to write this frame at this timestamprecorder.setTimestamp(videoTS);}recorder.recordPacket(packet);}recorder.stop();grabber.stop();}}

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