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• download rtmp live stream video secondly

  15 July 2024, by Chenguang He

  I'm working on a java project to create a rtmp server and download the real-time flv video every second(need to download multiple recording frame secondly instead of download entire recording after live stream finished)
This is my logic, firstly listen to the rtmp channel to write video and audio into file

  


  if(msg instanceof VideoMessage vm){
byteArrayOutputStream = new ByteArrayOutputStream();
 byteArrayOutputStream.writeBytes(vm.getVideoData());
            File file = new File("tmp/video_" + i);
            FileOutputStream fos = new FileOutputStream(file);
            fos.write(byteArrayOutputStream.toByteArray());
            fos.close();

}


  


  Then decode to H264 to get playable flv file

  


  FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(input);
grabber.setFormat("h264");
        grabber.start();
FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(outputFilePath, grabber.getImageWidth(), grabber.getImageHeight());
recorder.start();
while ((frame = grabber.grab()) != null) {
            recorder.record(frame);
        }
grabber.stop();
        grabber.release();
        recorder.stop();
        recorder.release();
}


  


  But this login was failed. I met this issue when I implemented the ffmpeg

  


  data partitioning is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.


  


  Is there any other idea to solve this or other way to achieve the logic? Thanks

  


• Converting series of images with ffmpeg results in black video [migrated]

  27 April 2013, by Marco Gagliardi

  I've just downloaded ffmpeg since it seems to perfectly match my needs (make a video from a set of pictures). I'm currently playing around with some examples just to get started and there's something weird happening that I can't explain.
  I'm trying this command (provided in the official documentation):

  ffmpeg -f image2 -pattern_type glob -i 'foo-*.jpeg' -r 12 -s WxH foo.avi

  on a data set of 10 jpg pictures (of course I changed the pattern with '*.jpg'). The video seems to be encoded correctly but it's simply too fast to be sure about that (anyway it stops on the last frame that corresponds to the last picture). In order to get a longer video i thought to low the frame rate from 12 to 1 (one sec each picture) or 0.5 (2 sec each one) and so on.. no way! with low rate values even if the video is played the pictures are simply not displayed. The player (VLC in my case) just shows a blank/empty video for a few seconds.

  Am I making something wrong or have I misunderstood the -r parameter? Is it something related to codecs involved? Finally.. How can i get each picture displayed for 1 or 2 seconds?

  Here's the output:

  MacBook-Pro$ ffmpeg -f image2 -pattern_type glob -i '*.jpg' -r 1 -s 200x300 foo.avi
  
  ffmpeg version N-52517-g1e4f75d Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Apr 27 2013 19:41:11 with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
  
    configuration: --disable-yasm
  
    libavutil      52. 27.101 / 52. 27.101
  
    libavcodec     55.  6.100 / 55.  6.100
  
    libavformat    55.  3.100 / 55.  3.100
  
    libavdevice    55.  0.100 / 55.  0.100
  
    libavfilter     3. 61.100 /  3. 61.100
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
  Input #0, image2, from '*.jpg':
  
    Duration: 00:00:00.40, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: mjpeg, yuvj422p, 2560x1920 [SAR 1:1 DAR 4:3], 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  File 'foo.avi' already exists. Overwrite ? [y/N] y
  
  Output #0, avi, to 'foo.avi':
  
    Metadata:
  
      ISFT            : Lavf55.3.100
  
      Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 200x300 [SAR 2:1 DAR 4:3], q=2-31, 200 kb/s, 1 tbn, 1 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg -> mpeg4)
  
  Press [q] to stop, [?] for help
  
  frame=    2 fps=0.0 q=2.0 Lsize=      43kB time=00:00:02.00 bitrate= 177.1kbits/s dup=0 drop=8    
  
  video:38kB audio:0kB subtitle:0 global headers:0kB muxing overhead 15.099197%
  
  MacBook-Pro$ 

• Java merge? mix? 2 audio files(mp3) parallely and download it

  4 February 2024, by JoonSeo Yang

  is there any way to mix 2 audio files parallely and let user download it?

  


  I was trying it by ffmpeg

  


  FFmpegBuilder builder = new FFmpegBuilder()
                .overrideOutputFiles(true)
                .setInput(audioInputPath1)
                .addInput(audioInputPath2)
                .addOutput(outputFilePath)
                .setFormat("mp3")
                .setAudioCodec("libmp3lame")
                .setAudioBitRate(256000)
                .done();

        executor.createJob(builder).run();


  


  but it doesnt work by codec problem, so i want to know if there any other way to reach my goal, or fix my ffmpeg code to make it work?