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• How to Output Mjpeg from Kokorin Jaffree FFmpeg via UDP to a Localhost Port ?

  14 octobre 2022, par roba

  I have a Java program which displays dual webcams and records them to file in FHD 30fps H264/H265. It uses Sarxos Webcam for the initial setup and display but when recording, it switches to Jaffree FFmpeg. During recording Sarxos Webcam must release its webcam access and cannot display while recording continues.

  


  I have tried recording with Xuggler/Sarxos but Sarxos seems to only access raw video from the webcams which creates limitations in the frame rate and resolution which can be achieved. At 1920x1080 the cameras can only deliver 5 fps raw video.

  


  I am trying to direct mjpeg streams from Jaffree to localports for display purposes during recording but I cannot figure out how to do it.

  


  Simultaneous recording plus sending to a port can be done from the terminal with the following :

  


  ffmpeg -f  dshow  -video_size 1920x1080 -rtbufsize 944640k -framerate 25 -vcodec mjpeg  -i video="Logitech Webcam C930e" -pix_fmt yuv420p -c:v libx264 outFHDx25.mp4 -f mpegts udp://localhost:1234?pkt_size=188&buffer_size=65535


  


  and viewed from the port in a different terminal like this :

  


  ffplay -i udp://localhost:1234


  


  The video which displays is a little blocky compared with the video recorded to file. Any suggestions on how to improve this would be appreciated.

  


  Note that FFPlay is not included in Jaffree FFMpeg.

  


  I would like to send the mjpeg to a port and then read it into the Sarxos Webcam viewer to display while recording is in progress.

  


  The Jaffree Java code for recording the output of one webcam to file follows. It takes the mjpeg/yuv422p output from the webcam and normally encodes it to file as H264/yuv420p :

  


  public static FFmpeg createTestFFmpeg() {
      String camera1Ref = "video=" + cam1Vid + ":audio=" + cam1Aud;
          return FFmpeg.atPath()
              .addArguments("-f", "dshow")  //selects dshow for Windows
              .addArguments("-video_size", resString)  //video resolution  eg 1920x1080          
              .addArguments("-rtbufsize", rtBufResultString) 
              .addArguments("-thread_queue_size", threadQ)
              .addArguments("-framerate", fpsString)   // capture frame rate  eg 30fps         
              .addArguments(codec, vidString)  //set capture encode mode from camera
              .addArgument(audio) //on or off
              .addArguments("-i", camera1Ref)   // name of camera to capture
              .addArguments("-pix_fmt", pixFmt)
              .addArguments("-c:v", enc2)  //eg enc2 = "libx264", "h264_nvenc"
              .addArguments(enc3, enc4)  //enc3 = "-crf", enc4 = "20"
              .addArguments(enc5, enc6)  //enc5 = "-gpu:v", enc6 = "0"
              .addArguments(enc7, enc8)  //enc7 = "-cq:v", enc8 = "20"
              .addArguments(enc9, enc10)  //enc9 = "-rc:v", enc10 = "vbr"
              .addArguments(enc11, enc12)  //enc11 = "-tune:v", enc12 = "ll"
              .addArguments(enc13, enc14)  //enc13 = "-preset:v", enc14 = "p1" 
              .addArguments(enc15,enc16)  //enc15 = "-b:v", enc16 = "0"
              .addArguments(enc17, enc18)  //enc17 = "-maxrate:v", enc18 = "5000k"
              .addArguments(enc19, enc20)  //enc19 = "-bufsize:v", enc20 = "5000k"
              .addArguments(enc21, enc22)  //enc21 = "-profile:v", enc22 = "main"
              .addArgument(noFFStats) //"-nostats"{, stops logging progress/statistics
              .addArguments("-loglevel", ffLogLevel)  //error logging
              .addArgument(bannerResultString)  // "-hide_banner"
              .addArguments("-rtbufsize", rtBufResultString) 
              .setOverwriteOutput(true)   // overwrite filename if it exists  Boolean = overwriteFile
              .addOutput(
                  UrlOutput
                      .toUrl(filePathL))                    
              .setProgressListener(new ProgressListener(){
                  @Override
                  public void onProgress(FFmpegProgress progress){
                     if(ffProgress){ 
                          System.out.println(progress);
                          
                     } 
                    }
            } );
            
   }


  


  How and where do I add the code to output mjpeg via UDP to a localport while simultaneously writing H264 to a file, and what is the syntax ? I am sure it must be simple but I seem to have tried all of the permutations without success. I can write to a file OR I can output to a port but I cannot do both.

  


• avcodec/mediacodecdec : don't break out if both input and output port return try again

  19 octobre 2022, par Zhao Zhili

  avcodec/mediacodecdec : don't break out if both input and output port return try again
  At the beginning of decoding, if we feed mediacodec too fast, the
  
  input port will return try again. It takes some time for mediacodec
  
  to consume bitstream and output frame. So the output port also return
  
  try again. It possible that mediacodec_receive_frame doesn't consume
  
  any AVPacket and no AVFrame is output. Then both avcodec_send_packet()
  
  and avcodec_receive_frame() return EAGAIN, which shouldn't happen.
  This bug can be produced with decoding benchmark on Pixel 3.
  Signed-off-by : Zhao Zhili <zhilizhao@tencent.com>
  

  • [DH] libavcodec/mediacodecdec.c

• which port ffmpeg is using for streaming to a rtmp(or rtmps) server running in a cloud location

  12 janvier 2023, par elsa

  I am working with ffmpeg and rtmp camera streaming in a constrained environment.
I have rtmp server running on a cloud (say eg. 11.23.123.13 in port 1935 for rtmp & 4936 for rtmps).
However is there any port on sending end , i should request team to open to avoid blocking the stream sending from device end to rtmp server end(camera streaming end). Only port 443 is open in device where camera connected and ffmpeg commands are running.

  


  It would be helpful if somebody give insights on how network is connecting from ffmpeg encoder to rtmp server

  


  

  1. Getting the details how network is connecting from ffmpeg encoder to rtmp server ?

  


  2. Which ports to be open in device end(where camera connecting) to start ffmpeg streaming to rtmp server running on cloud ?