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c++videoffmpegdecodervaapi

How to convert from AV_PIX_FMT_VAAPI to AV_PIX_FMT_YUV420 using FFMPEG sws_scaler api?

I am using below code to convert from VAAPI to YUV420 format.

     AVFrame* src, * dst;
     SwsContext* conversion_context_ = sws_getContext(videoDecoder_->width(),     videoDecoder_->height(), AV_PIX_FMT_VAAPI,scaler_->getWidth(), scaler_->getHeight(), AV_PIX_FMT_YUV420P,(int)SWS_BICUBIC,
 nullptr, nullptr, nullptr); <------------- This function is returning NULL value.
     sws_scale(conversion_context_,
                (uint8_t const * const *)src->data, src->linesize, 0, (int)height,
                dst->data, dst->linesize);

Can some one tell me why I am getting NULL value of SwsContext's pointer?

Solution

  • Fixed this issue by using below code,

    SwsContext* conversion_context_ = sws_getContext(videoDecoder_->width(),     videoDecoder_->height(), AV_PIX_FMT_NV12 ,scaler_->getWidth(), scaler_->getHeight(), AV_PIX_FMT_YUV420P,(int)SWS_BICUBIC,
 nullptr, nullptr, nullptr);

    So instead of AV_PIX_FMT_VAAPI option, I used AV_PIX_FMT_NV12.