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• avformat_open_input fails only with a custom IO context

  19 janvier 2017, par Tim

  Running into an odd issue with avformat_open_input, it is failing with :

  Invalid data found when processing input

  But this only happens when I attempt to read the file using a custom AVIOContext.

  My custom code is as follows (error checking omitted for clarity) :

  auto fmtCtx = avformat_alloc_context();
  
  auto ioBufferSize = 32768;
  
  auto ioBuffer = (unsigned char *)av_malloc(ioBufferSize);
  
  auto ioCtx = avio_alloc_context(ioBuffer,
  
                                  ioBufferSize,
  
                                  0,
  
                                  reinterpret_cast<void>(this),
  
                                  &amp;imageIORead,
  
                                  NULL,
  
                                  &amp;imageIOSeek));
  
  
  
  fmtCtx -> pb = ioCtx;
  
  fmtCtx -> flags |= AVFMT_FLAG_CUSTOM_IO;
  
  
  
  int err = avformat_open_input(&amp;fmtCtx, NULL, NULL, NULL);
  
  </void>

  imageIOSeek is never called, but properly handles the whence parameter including the AVSEEK_SIZE option. My file data is already loaded in memory, so imageIORead is trivial (returning 0 at EOF) :

  int imageIORead(void *opaque, uint8_t *buf, int buf_size) {
  
      Image *d = (Image *)buf;
  
      int rc = std::min(buf_size, static_cast<int>(d->data.size() - d->pos));
  
  
  
      memcpy(buf, d->data.data() + d->pos, rc);
  
      d->pos += rc;
  
      return rc;
  
  }
  
  </int>

  The data being read is loaded from a file on disk :

  /tmp/25.jpeg

  The following code is able to open and extract the image correctly :

  auto fmtCtx = avformat_alloc_context();
  
  int err = avformat_open_input(&fmtCtx, "/tmp/25.jpeg", NULL, NULL);

  The project is using a minified version of libavformat including only the formats we need. I don’t believe this is the cause of the problem since the file can be open and handled properly when the path is specified. I haven’t seen any configure options specifically targeting support for custom IO contexts.

  This is the image in question : 25.jpeg

• Anomalie #4286 : Notice : _DIR_PLUGINS_AUTO already defined ecrire/inc/plugin.php on line 24

  12 février 2019, par PIerre LASZCZAK

  
  — - ecrire/inc/plugin.php    (revision )
  +++ ecrire/inc/plugin.php    (revision )
  @@ -21,7 +21,9 @@
   
   /** l’adresse du repertoire de telechargement et de decompactage des plugins */
  
   define(’_DIR_PLUGINS_AUTO’, _DIR_PLUGINS . ’auto/’) ;
  
  +if (!defined(’_DIR_PLUGINS_AUTO’))
  
  +    define(’_DIR_PLUGINS_AUTO’, _DIR_PLUGINS . ’auto/’) ;
  
  +
   #include_spip(’inc/texte’) ; // ????? Appelle public/parametrer trop tot avant la reconstruction du chemin des plugins.
  
   include_spip(’plugins/installer’) ;
  

• Derive qsv hwdevice from D3D11VA hwdevice using FFMPEG

  29 mars 2022, par Caio Augusto

  I'm trying to derive a QSV hwcontext from D3D11VA device in order to encode d3d11 frames but I'm getting an error when calling av_hwdevice_ctx_create_derived.

  


    buffer_t ctx_buf { av_hwdevice_ctx_alloc(AV_HWDEVICE_TYPE_D3D11VA) };

  auto ctx = (AVD3D11VADeviceContext *)((AVHWDeviceContext *)ctx_buf->data)->hwctx;

  std::fill_n((std::uint8_t *)ctx, sizeof(AVD3D11VADeviceContext), 0);

  auto device = (ID3D11Device *)hwdevice_ctx->data;

  device->AddRef();
  ctx->device = device;

  ctx->lock_ctx = (void *)1;
  ctx->lock     = do_nothing;
  ctx->unlock   = do_nothing;

  auto err = av_hwdevice_ctx_init(ctx_buf.get());


  


  and then I call

  


    av_hwdevice_ctx_create_derived(&derive_hw_device_ctx, AV_HWDEVICE_TYPE_QSV, ctx_buf.get(), 0);


  


  I'm seeing this in the log :

  


  [AVHWDeviceContext @ 000001de119a9b80] Initialize MFX session: API version is 1.35, implementation version is 1.30
[AVHWDeviceContext @ 000001de119a9b80] Error setting child device handle: -16


  


  Please let me know if you have any idea how to fix it or a different approach to encode d3d11 frames on QSV encoder.

  


  Thank you.

  


  OS: windows 10 64bits
CPU: Intel i5-8400
Graphics card: Nvidia GT1030 (has no hw encoder)