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• avformat : Auto-detect mjpeg 2000 in mpeg-ts

  11 octobre 2016, par Ståle Kristoffersen

  avformat : Auto-detect mjpeg 2000 in mpeg-ts
  This makes it possible to decode motion jpeg 2000
  
  encoded in a transport stream without a correct PMT/PAT.
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/Makefile
  • [DH] libavformat/allformats.c
  • [DH] libavformat/mj2kdec.c
  • [DH] libavformat/utils.c
  • [DH] libavformat/version.h

• Render an IDirect3DSurface9 from DXVA2 ?

  18 janvier 2019, par TTGroup

  I got a IDirect3DSurface9 from DXVA2 video decoder using hardware acceleration.

  I’m try to Render this hardware IDirect3DSurface9 on My Window via its handle. The following is my summary code.

  The first, I call dxva2_init(AVCodecContext *s, HWND hwnd) ; with hwnd is window’s handle

  int dxva2_init(AVCodecContext *s, HWND hwnd)
  
  {
  
      InputStream *ist = (InputStream *)s->opaque;
  
      int loglevel = (ist->hwaccel_id == HWACCEL_AUTO) ? AV_LOG_VERBOSE : AV_LOG_ERROR;
  
      DXVA2Context *ctx;
  
      int ret;
  
  
  
      if (!ist->hwaccel_ctx) {
  
          ret = dxva2_alloc(s);
  
          if (ret < 0)
  
              return ret;
  
      }
  
      ctx = (DXVA2Context *)ist->hwaccel_ctx;
  
      ctx->deviceHandle = hwnd;
  
      if (s->codec_id == AV_CODEC_ID_H264 &&
  
          (s->profile & ~FF_PROFILE_H264_CONSTRAINED) > FF_PROFILE_H264_HIGH) {
  
          av_log(NULL, loglevel, "Unsupported H.264 profile for DXVA2 HWAccel: %d\n", s->profile);
  
          return AVERROR(EINVAL);
  
      }
  
  
  
      if (ctx->decoder)
  
          dxva2_destroy_decoder(s);
  
  
  
      ret = dxva2_create_decoder(s);
  
      if (ret < 0) {
  
          av_log(NULL, loglevel, "Error creating the DXVA2 decoder\n");
  
          return ret;
  
      }
  
  
  
      return 0;
  
  }

  After Decoding successful, I got got a IDirect3DSurface9, and I Render it by following function.

   int dxva2_render(AVCodecContext *s, AVFrame *frame)
  
  {
  
      LPDIRECT3DSURFACE9 surface = (LPDIRECT3DSURFACE9)frame->data[3];
  
      InputStream        *ist = (InputStream *)s->opaque;
  
      DXVA2Context       *ctx = (DXVA2Context *)ist->hwaccel_ctx;
  
  
  
      try
  
      {
  
          lockRenderCS.Enter();
  
          HRESULT hr = ctx->d3d9device->Clear(0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(255, 0, 0), 1.0f, 0);
  
          if (hr != D3D_OK)
  
              return 0;
  
  
  
          hr = ctx->d3d9device->BeginScene();
  
          if (hr != D3D_OK)
  
              return 0;
  
  
  
          hr = ctx->d3d9device->GetBackBuffer(0, 0, D3DBACKBUFFER_TYPE_MONO, &pBackBuffer);
  
          if (hr != D3D_OK)
  
              return 0;
  
  
  
          hr = ctx->d3d9device->StretchRect(surface, NULL, pBackBuffer, NULL, D3DTEXF_LINEAR);
  
          if (hr != D3D_OK)
  
              return 0;
  
  
  
          hr = ctx->d3d9device->EndScene();
  
          if (hr != D3D_OK)
  
              return 0;
  
  
  
          hr = ctx->d3d9device->Present(NULL, NULL, NULL, NULL);
  
          if (hr != D3D_OK)
  
              return 0;
  
      }
  
      finally
  
      {
  
          lockRenderCS.Leave();
  
      }
  
      return 0;
  
  }

  Note : All D3D function above : Clear(), BeginScene(), GetBackBuffer(), StretchRect(), EndScene(), Present() were return Successful. But the frame was not display on My Window.

  I Guess that, I miss some code for integrated My Window Handle with DXVA2Context. In this code I only assign : ctx->deviceHandle = hwnd; in function dxva2_init().

  I search many times, but so far I still cannot find the solution, Anyone can help me ?

  Many Thanks !

• Electron and NodeJS : Execute shell command asyncronously with live stream

  28 septembre 2020, par Bruno Freire

  Electron : get file conversion percent in real-time :

  


  I wanna run the command ffmpeg -i video.mp4 (example) to convert a video into another format. But I want to get the conversion percent that is streamed in the process output and get it in my Electron App or NodeJS.

  


  I've tried all methods : spawn fork exec and all of them return me the last line of the process output. I want a LIVE Stream of each line that is been written, to show the percent progress.

  


  I've tried :

  


  Fork

  


  const {fork} = require('child_process')
    const forked = fork('ffmpeg -i video.mp4');
    forked.on('message', (msg) => {
        console.log(msg);
})


  


  Exec Alternative 1

  


  const execFile = require('child_process').execFile;
    execFile('ffmpeg -i video.mp4', [], (e, stdout, stderr) => {
        if (e instanceof Error){
            console.error(e);
            
        }
        console.log('stdout ', stdout)
        console.log('stderr ', stderr);
})


  


  Exec Alternative 2

  


  const exec = require('child_process').exec;
    exec('ffmpeg -i video.mp4', (error, stdout, stderr) => { 
       console.log(stdout); 
});

/*EXEC Alternative 2*/
const exec = require('child_process').exec;
const proccessing = exec('ffmpeg -i video.mp4');
proccessing.stdout.on('data', function(data) {
  console.log(data); 
});
proccessing.stdout.pipe(process.stdout);


  


  Spawn

  


  const spawn = require('child_process').spawn,
const processing = spawn('ffmpeg -i video.mp4');

processing .stdout.on('data', function (data) {
   console.log('stdout: ' + data.toString());
});

processing .stderr.on('data', function (data) {
   console.log('stderr: ' + data.toString());
});

processing .on('exit', function (code) {
   console.log('code ' + code.toString());
});


  


  SUMMARY :

  


  럎