[Libav-user] Hardware accelerated video decoding

[Edimar Rangel]

Hi

I'm facing a high memory usage consumption on video decoding, seems to be
some memory leak, but I did not manage to find it.

Processor:11th Gen Intel(R) Core(TM) i5-11400H @ 2.70GHz   2.69 GHz, 6
cores, 12 threads
GPU: NVIDIA GeForce RTX 3050 Laptop GPU, 4gb GDDR6 6001.0 MHz
OS:

I've tried with CUDA, D3D11VA and DXVA2, until now DXVA2 presents the best
results.

These are the steps:


   1. Initialize TAVHWDeviceType by av_hwdevice_find_type_by_name('dxva2')
   2. Initialize PAVCodec by avcodec_find_decoder(), it's TAVCodecId
   parameter can assume one of these values  [Mpeg4, H264, HEVC, MJPEG]
   3. Initialize PAVCodecHWConfig by:
   while True do
   begin
     vHWConfig := avcodec_get_hw_config(fCodec, vCount);

     Inc(vCount);

     if not Assigned(vHWConfig) then
       Break;

     if ((vHWConfig.methods and AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX) <>
   0) and (vHWConfig.device_type = vType) then
       fHWPixelFormat := vHWConfig.pix_fmt;
   end;
   4. Use av_hwdevice_ctx_create to set
   in PAVCodecContext.hw_device_ctx variable
   5. When decoding I'm using avcodec_send_packet and avcodec_receive_frame
   functions
   6. Using av_hwframe_transfer_data to copy from GPU memory to CPU memory
   7. Finally I'm using sws_getContext and sw_scale to convert the image
   8. After decoding these variables are been cleaned:
   av_frame_free(@vSWFrame);
   av_buffer_unref(@vBuffer);
   av_freep(@vBuffer);
   av_packet_unref(@vPacket);
   av_packet_free(@vPacket);


I'm using Delphi 10.3 and FastMM4  doesn't report any memory leak, but all
the RAM available it's being used.

Is there any known issue that can be causing this?
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