[FFmpeg-user] Bad dst image pointers

[Diederick C. Niehorster]

av_frame_alloc alone is not enough, you also need to allocate the
memory for the image data, e.g. using av_image_alloc

see e.g. https://ffmpeg.org/doxygen/trunk/doc_2examples_2decoding_encoding_8c-example.html

On Mon, Jul 12, 2021 at 1:09 PM 李罗 <bruce_lee0815 at 163.com> wrote:
>
>
> I have already connected and opened camera successfully. But I can not transfor frame data from AV_PIX_FMT_YUVJ422P to AV_PIX_FMT_BGR24 after decoding. As I call method sws_scale, 'bad dst iamge pointers' shows up. Any help will be appreciate, my code:
>
>
>      AVFrame* pFrame, * pFrameYUV;
>      pFrame = av_frame_alloc();
>      pFrameYUV = av_frame_alloc();
>
>      int ret, got_picture;
>      AVPacket* packet = (AVPacket*)av_malloc(sizeof(AVPacket));
>
>      struct SwsContext* img_convert_ctx;
>      img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, AV_PIX_FMT_BGR24, SWS_BICUBIC, NULL, NULL, NULL);
>
>      if (av_read_frame(pFormatCtx, packet) >= 0) {
>           if (packet->stream_index == videoindex) {
>                ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet);
>                if (ret < 0) {
>                     return NULL;
>                }
>                if (got_picture) {
>                     sws_scale(img_convert_ctx, (const unsigned char* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize);
>                }
>           }
>           av_free_packet(packet);
>      }
>
> | |
> 李罗
> |
> |
> 邮箱bruce_lee0815 at 163.com
> |
>
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