Rtmp streams are stored as mp4 files

[fantasylhd]

Hi，I want to store the rmtp stream as an mp4 file，For example, use the ffmpeg command ：ffmpeg -i rtmp://xx.com/3573613170/18573613170 -f mp4 -vcodec copy -acodec copy C:\Users\lhd\Desktop\2.mp4
But what should we do in javacv can you give me some advise? thank you! If there is some example code, that's perfect! thank you ~~

This is the code I tried to use javacv to complete this task, but the recorded video cannot be played：

        FFmpegFrameGrabber grabber = new FFmpegFrameGrabber("rtmp://xx.com/3573613170/18573613170");
        grabber.start();
        FFmpegFrameRecorder recorder = new FFmpegFrameRecorder("C:\\Users\\lhd\\Desktop\\2.mp4", grabber.getImageWidth(), grabber.getImageHeight(),grabber.getAudioChannels());
        recorder.setFormat("mp4");
        recorder.start(grabber.getFormatContext());
        LocalDateTime startTime = LocalDateTime.now();
        int times = 0;
        AVPacket avPacket = null;
        while (startTime.plusSeconds(10).compareTo(LocalDateTime.now()) > 0) {
            avPacket = grabber.grabPacket();
            if (avPacket != null) {
                recorder.recordPacket(avPacket);
                times++;
                System.out.println("record! "+times);
            }
        }
        recorder.close();
        grabber.close();

Dependent version：

        <dependency>
            <groupId>org.bytedeco</groupId>
            <artifactId>javacv-platform</artifactId>
            <version>1.5.8</version>
        </dependency>

[saudet]

We can easily use the ffmpeg program from Java as well if that does what you need:
http://bytedeco.org/javacpp-presets/ffmpeg/apidocs/org/bytedeco/ffmpeg/ffmpeg.html

[fantasylhd]

What is the problem with my code? Javacv does not support such writing

[saudet]

Well, you didn't set the codec, so maybe it's not using a codec supported by your player?

[fantasylhd]

Cannot play after encoder is set

        FFmpegFrameGrabber grabber = new FFmpegFrameGrabber("rtmp://xxx.com/3573613170/18573613170");
        grabber.start();
        FFmpegFrameRecorder recorder = new FFmpegFrameRecorder("C:\\Users\\lhd\\Desktop\\2.mp4", grabber.getImageWidth(), grabber.getImageHeight(),grabber.getAudioChannels());
        recorder.setVideoCodec(grabber.getVideoCodec());
        recorder.setAudioCodec(grabber.getAudioCodec());
        recorder.setFormat("mp4");
        recorder.start(grabber.getFormatContext());
        LocalDateTime startTime = LocalDateTime.now();
        int times = 0;
        AVPacket avPacket = null;
        while (startTime.plusSeconds(10).compareTo(LocalDateTime.now()) > 0) {
            avPacket = grabber.grabPacket();
            if (avPacket != null) {
                recorder.recordPacket(avPacket);
                times++;
                System.out.println("record! "+times);
            }
        }
        recorder.close();
        grabber.close();

[fantasylhd]

Stored as flv files can be played

        FFmpegFrameGrabber grabber = new FFmpegFrameGrabber("rtmp://xxx.com/3573613170/18573613170");
        grabber.start();
        FFmpegFrameRecorder recorder = new FFmpegFrameRecorder("C:\\Users\\lhd\\Desktop\\2.flv", grabber.getImageWidth(), grabber.getImageHeight(),grabber.getAudioChannels());
//        recorder.setVideoCodec(grabber.getVideoCodec());
//        recorder.setAudioCodec(grabber.getAudioCodec());
        recorder.setFormat("flv");
        recorder.start(grabber.getFormatContext());
        LocalDateTime startTime = LocalDateTime.now();
        int times = 0;
        AVPacket avPacket = null;
        while (startTime.plusSeconds(10).compareTo(LocalDateTime.now()) > 0) {
            avPacket = grabber.grabPacket();
            if (avPacket != null) {
                recorder.recordPacket(avPacket);
                times++;
                System.out.println("record! "+times);
            }
        }
        recorder.close();
        grabber.close();