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• doc/mailing-list-faq : auto unsubscribe due to DMARC

  20 avril 2019, par Lou Logan

  doc/mailing-list-faq : auto unsubscribe due to DMARC
  Signed-off-by : Lou Logan <lou@lrcd.com>
  

  • [DH] doc/mailing-list-faq.texi

• Revision 6809ecc820 : usage.dox : fix doxygen warnings in 1.8.x use \li to denote list items with \if.

  14 mars 2015, par James Zern

  Changed Paths :
   Modify /usage.dox

  
  
  usage.dox : fix doxygen warnings in 1.8.x

  use \li to denote list items with \if.

  fixes the following likely visible in <1.8.3 :
  usage.dox : warning : Invalid list item found
  usage.dox : warning : End of list marker found without any preceding list items

  Change-Id : I33c72799edf9f8866596ac8f79247050b8c75681

• FFmpeg : The hardware pixel format is not supported by the device type

  14 mars 2024, par ffvideoner

  Windows, C#, FFmpeg.AutoGen

  &#xA;

  I want to use hardware acceleration to encode videos using FFmpeg.

  &#xA;

  These are parts of my code :

  &#xA;

  AVBufferRef* hw_device_ctx = null;
int err = ffmpeg.av_hwdevice_ctx_create(&hw_device_ctx, AVHWDeviceType.AV_HWDEVICE_TYPE_DXVA2, null, null, 0);

AVBufferRef* hw_frames_ref;
AVHWFramesContext* frames_ctx = null;

hw_frames_ref = ffmpeg.av_hwframe_ctx_alloc(hw_device_ctx);

frames_ctx = (AVHWFramesContext*)(hw_frames_ref->data);

for (int i = 0; i < 256; i++)
{

    frames_ctx->format    = (AVPixelFormat)i;
    frames_ctx->sw_format = (AVPixelFormat)i;
    
    frames_ctx->width = ctx->width;
    frames_ctx->height = ctx->height;
    frames_ctx->initial_pool_size = 20;
    
    ffmpeg.av_hwframe_ctx_init(hw_frames_ref);

}


  &#xA;

  That is, all AVPixelFormat values are enumerated.

  &#xA;

  Besides AV_HWDEVICE_TYPE_DXVA2 I also use AV_HWDEVICE_TYPE_CUDA and AV_HWDEVICE_TYPE_D3D11VA.

  &#xA;

  I get one response for all AVHWDeviceType and for all AVPixelFormat :

  &#xA;

  The hardware pixel format %PixelFormat% is not supported by the device type %DeviceType%


  &#xA;

  Why isn't any pixel format supported ?

  &#xA;

  FFmpeg code sources :

  &#xA;

  int av_hwframe_ctx_init(AVBufferRef *ref)
{
    FFHWFramesContext *ctxi = (FFHWFramesContext*)ref->data;
    AVHWFramesContext *ctx  = &ctxi->p;
    const enum AVPixelFormat *pix_fmt;
    int ret;

    if (ctxi->source_frames) {
        /* A derived frame context is already initialised. */
        return 0;
    }

    /* validate the pixel format */
    for (pix_fmt = ctxi->hw_type->pix_fmts; *pix_fmt != AV_PIX_FMT_NONE; pix_fmt++) {
        if (*pix_fmt == ctx->format)
            break;
    }
    if (*pix_fmt == AV_PIX_FMT_NONE) {
        av_log(ctx, AV_LOG_ERROR,
               "The hardware pixel format '%s' is not supported by the device type '%s'\n",
               av_get_pix_fmt_name(ctx->format), ctxi->hw_type->name);
        return AVERROR(ENOSYS);
    }

}


  &#xA;

  ...

  &#xA;

  const HWContextType ff_hwcontext_type_dxva2 = {
    .type                 = AV_HWDEVICE_TYPE_DXVA2,
    .name                 = "DXVA2",

    .device_hwctx_size    = sizeof(AVDXVA2DeviceContext),
    .frames_hwctx_size    = sizeof(DXVA2FramesContext),

    .device_create        = dxva2_device_create,
    .frames_init          = dxva2_frames_init,
    .frames_uninit        = dxva2_frames_uninit,
    .frames_get_buffer    = dxva2_get_buffer,
    .transfer_get_formats = dxva2_transfer_get_formats,
    .transfer_data_to     = dxva2_transfer_data_to,
    .transfer_data_from   = dxva2_transfer_data_from,
    .map_from             = dxva2_map_from,

    .pix_fmts             = (const enum AVPixelFormat[]){ AV_PIX_FMT_DXVA2_VLD, AV_PIX_FMT_NONE },
};


  &#xA;

  Similarly for other device types.

  &#xA;

  That is, at least one pixel format must be supported !

  &#xA;