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• Optimize ffmpeg for text with mpeg1

  20 septembre 2022, par lmalves

  I'm kind of new to video enconding and decoding but I'm currently working with NodeJS and I need to stream the content of a window (using electron) to an angular app.

  


  In my current implementation I'm "grabbing" the app window content :

  


  ffmpeg -f gdigrab -i title="Windows App" -vcodec mpeg1video -r 30 -b:v 10  -bufsize:v 327680 -f rtp rtp://127.0.0.1:1234

  


  Then I'm conveting to http:

  


  ffmpeg -i rtp://127.0.0.1:1234 -protocol_whitelist file,crypto,udp,rtp,http,tcp -f mpegts -codec:v mpeg1video -s 500x515 -b:v 10 -bf 0 http://localhost:59655/

  


  And on the client app using MpegJS to display it with almost the default configuration.

  


  It works relativelly well except for some parts of text where if the font is smaller it's almost impossible to read it.

  


  Like I said I'm new on this and I'm not sure how to optimize it to text.
Any suggestions ?

  


• 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.

  


• ffmpeg only works 2 instances

  31 janvier 2023, par Alex

  I have 3 usb web cameras. Im using Windows 7.

  


  I have 3 usb web cameras

  


  And I need to create 3 video streams :

  


  ffmpeg -f dshow -i video="Full HD webcam" -vcodec libx264 -tune zerolatency -threads 0 -b 900k -f mpegts udp ://localhost:1234

  


  ffmpeg -f dshow -i video=”@device_pnp_~?\usb#vid_1908&pid_2311&mi_00#8&134fde2a&0&0000#65e8773d-8f56-11d0-a3b9-00a0c9223196\global” -vcodec libx264 -tune zerolatency -threads 0 -b 900k -f mpegts udp ://localhost:1233

  


  ffmpeg -f dshow -i video="@device_pnp_~?\usb#vid_1908&pid_2311&mi_00#8&962d85&0&0000#65e8773d-8f56-11d0-a3b9-00a0c9223196\global" -vcodec libx264 -tune zerolatency -threads 0 -b 900k -f mpegts udp ://localhost:1232

  


  But only works 2 any instances of video streams. When I try to create third video stream I get error :

  


  I get error

  


  Can anybody help me, please ?

  


  i tried to create 3 video streams, but could only create 2 instances of ffmpeg process.