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• FFMPEG and NVENC / HVEC low utilisation

  7 octobre 2018, par Deex

  I did some experiments with NVENC and HEVC encoding. It is working but i see only a low GPU Usage between 20-35%. So i read a about it and found some article that my GTX 1080 can only use two sessions according to https://developer.nvidia.com/video-encode-decode-gpu-support-matrix#Encoder . So my first questions are
  1) how can i find out if this is the reason for the low Utilisation
  2) Is there a way with ffmpeg to use the GPU more efficient
  3) What is about the new updatet NVENC Codec for the Nvidia RTX 2080 TI, does it support more sessions ? Would it be a good idea to use it in SLI for video Encoding in the future because of the buff, or should i look for a Quadro Card ?

  My command is

  ffmpeg -f concat -safe 0 -hwaccel auto -i "D:\-=streaming=-\concats\convertme\index.txt" -i "D:\-=streaming=-\concats\convertme\index.txt" ^
-y -preset slow -c:v hevc_nvenc -preset llhq -rc:v cbr_ld_hq -rc cbr_ld_hq -crf 25 -r 60 -movflags +faststart -c:a copy -pass 1 -2pass -1 "D:\-=streaming=-\concats\x265-website_high.mp4" ^
-y -preset slow -c:v hevc_nvenc -preset llhq -rc:v cbr_ld_hq -rc cbr_ld_hq -crf 25 -r 60 -vf scale=640:360 -movflags +faststart -c:a copy -b:a 128k -pass 1 -2pass -1 "D:\-=streaming=-\concats\x265-website_low.mp4"

  

• Re-stream parameters for ffmpeg

  2 octobre 2013, par user2797543

  I stream my xbox to twitch tv. I'd like to be able to send this to multiple hosts (ie, Ustream, Veetle, etc) - but when I add more than a couple destinations to my xsplit - I get lag problems.

  I use rtmp address of stream and pass through ffmpeg to other destinations and it work well with no lag. But I see I am using internet speed for this.

  Can ffmpeg send a liverepeat request direct from server a to server b ? Someone informed me they know of a program which does this, but the developer has chose not to give it out.

  Thanks.

• video compression error in android

  27 avril 2017, par Arpan Sharma

  I am using ffmpeg for video compression in android.I an following this link
  But i always get exit code 1.I am trying to get video from VIDEO CAPTURE intent inside a fragment.
  This is my code

  final Clip clip_in = new Clip(videoPath);
  
          File fileTmp = activity.getCacheDir();
  
          File fileAppRoot = new File(activity.getApplicationInfo().dataDir);
  
  
  
          final Clip clip_out = new Clip(videoPath);
  
          //put flags in clip
  
          clip_out.videoFps = "30";
  
          clip_out.width = 480;
  
          clip_out.height = 320;
  
          clip_out.videoCodec = "libx264";
  
          clip_out.audioCodec = "copy";
  
  
  
          try {
  
              FfmpegController fc = new FfmpegController(getContext(), fileTmp);
  
              fc.processVideo(clip_in, clip_out, false, new ShellUtils.ShellCallback() {
  
  
  
                  @Override
  
                  public void shellOut(String shellLine) {
  
                      System.out.println("MIX> " + shellLine);
  
                  }
  
  
  
                  @Override
  
                  public void processComplete(int exitValue) {
  
                      if (exitValue != 0) {
  
  //                        System.err.println("concat non-zero exit: " + exitValue);
  
                          Log.d("ffmpeg", "Compilation error. FFmpeg failed");
  
                          Toast.makeText(activity, "result: ffmpeg failed", Toast.LENGTH_LONG).show();
  
                      } else {
  
                          if (new File("/storage/emulated/0/Developer/result2.mp4").exists()) {
  
                              Log.d("ffmpeg", "Success file:" + "/storage/emulated/0/Developer/result2.mp4");
  
                          }
  
                      }
  
                  }
  
              });
  
  
  
          } catch (Exception e) {
  
              // TODO Auto-generated catch block
  
              e.printStackTrace();
  
          }

  Any help will be appreciated.